Abstract
This paper presents the RST-AQ, a 22-item scale to measure the affective states related to the three motivational systems postulated by Reinforcement Sensitivity theory (RST-AQ): the Behavioral approach system (BAS), Behavioral inhibition system (BIS), and the Fight-Flight-Freeze system (FFFS). The three subscales are internally consistent. Results show an overall support for construct validity of our RST-AQ measure. The correlations of the RST-AQ subscales with other measures demonstrate a good convergent and divergent validity with regard to the subscales of BAS and BIS. The RTS-AQ Scale provides researcher with the first instrument to measures the affective states of the RST theory.
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Introduction
According to Reinforcement sensitivity theory (RST) there are three systems underlying responses to motivationally significant stimuli. The behavioral approach system (BAS; Corr & Cooper, 2016) mediates behavior toward positive/rewarding/appetitive stimuli, and it is believed to be associated with approach-related affects, such as enthusiasm, interest and joy. The Fight-Flight-Freeze system (FFFS; Corr & Cooper, 2016) underlies behavior away from negative/punishing/repulsive stimuli, and is accompanied by fearful affects. The Behavioral Inhibition system (BIS; Corr & Cooper, 2016) regulates conflicts between motivational tendencies, and is associated with anxiety. For example, the same sight of a dog can elicit quite different motivational, behavioral and emotional responses in different people: some might experience positive emotions and want to approach the dog. Others might experience fear and, hence, want to run away from the animal; yet others might experience anxiety and wonder whether it is safe or not to approach the animal. According to RST, these different ways of responding are accompanied by predominant activation of the BAS, FFFS and BIS, respectively. RST explicitly argues that individual differences in the strength or sensitivity of the three systems are a major source of personality differences (Corr & Cooper, 2016). This idea has given rise to a number of personality scales that measure temporally stable tendencies of people with which they activate their BIS, BAS and FFFS (Carver & White, 1994; Corr & Cooper, 2016).
Reinforcement sensitivity theory (RST) is not only a central theory in personality psychology; it also provides the basis of social psychological accounts of psychological conflict (McGregor et al., 2010; Nash et al., 2011; Harmon-Jones et al., 2016). These accounts commonly assume that activity levels can change dynamically in response to specific situations. These dynamic activations cannot be meaningfully measured with personality scales because such scales measure traits that are relatively stable over time. Instead, it is common practice to assess the momentary (changes in) activation of BIS and BAS with various ways; such as electroencephalography (Harmon-Jones et al., 2016; Nash et al., 2011; Agroskin et al., 2016) or the line bisection task (e.g., Bowers & Heilman, 1980; Milner et al., 1992; Fischer, 1994; Guinote, 2017). These approaches are based on the assumption that higher activity of the left hemisphere of the brain is associated with approach motivation. However, the line bisection task has been repeatedly shown to have little to no validity as indicator of approach motivation (Lee et al., 2004; Leggett et al., 2016; Hatin &Tottenham, 2016; Pugnaghi et al., 2018; Pugnaghi et al., 2019) and electroencephalography is difficult, expensive and time-consuming. Therefore, measures of affects would provide an interesting and economically sensible window into dynamic activation of BIS, BAS and FFFS. Researchers (e.g., Carver, & White, 1994; Greenaway et al., 2015; Bacon et al., 2017; Wytykowska et al., 2021; Wilson et al., 2021) have extensively shown that affects are indicators of the activation of BIS, or BAS or FFFS. In light of this, it is surprising that, as far as we know, there is no comprehensive, emotion-based instrument to assess the strength of BIS, BAS, and FFFS. Although there are already many existing traits based instruments (e.g., Torrubia et al., 2001; Corr & Cooper, 2016; Espinoza Oyarce, et al., 2021), there are no validated instruments to assess the affective aspects of the RST systems.
Following this line of thoughts an affect-based measure to assess the strength of BIS, BAS, and FFFS is extremely needed. That is because many before us have investigated affects in the context of the reinforcement sensitivity theory, adapting various already existing self-report measures (e.g., Merchàn-Clavellino et al., 2019; Bacon & Corr, 2017; Heponiemi et al., 2003) Nevertheless, these scales were validated to assess clinical affective conditions, but not validated for the purpose of tracking dynamic changes in affects based on the reinforcement sensitivity theory. For example, Hundt et al. (2007) measured BIS affects via the Anxious Arousal scale; The Anhedonic Depression scale, a General Distress Depression scale and a General Distress Anxiety scale. Indeed, measuring variables with adapted instruments presents limitations, as it is unsure if one is really assessing the theoretical construct intended to be measured. The purpose of the present paper is to provide researchers investigating fearful, anxious and approach-related affects based on RS theory with an instrument validated just for this purpose.
This research project is relevant for at least three reasons. First, as mentioned above, it serves scientists studying BIS, BAS and FFFS related affects with a short and easy to fill in self-report measure. Second, the project is valuable as the insights garnered from this research contributes to extend the current knowledge on these three affects in relation to three motivational systems underlying behaviors. Third, insights can be used for future studies aiming to further disentangle these three affects.
Theoretical framework
According to reinforcement sensitivity theory (RST; McNaughton & Gray, 2000; McNaughton & Corr, 2004, 2008; Corr & McNaughton, 2012; Espinoza Oyarce, et al., 2021), three motivational systems underlie behavior: the behavioral inhibition system (BIS), the behavioral approach system (BAS) and the fight-flight-freeze system (FFFS). Already in the 1980s, individual differences in sensitivity of these neurological systems have been related to different personality dispositions in reacting to the environmental stimuli (e.g., Fowles, 1987; Carver & White, 1994). Moreover, each one of these motivational systems is thought to produce typical affective experiences related to interest and joy in the case of BAS, or anxious and fearful affect in the case of BIS and FFFS, respectively (e.g.,Carver & White, 1994; Greenaway et al., 2015; Wytykowska et al., 2021; Moncel, et al., 2023). As mentioned before, the BIS needs to be distinguished from the FFFS system (Corr & Cooper, 2016). The FFFS is activated by unambiguously negative, repulsive, threatening stimuli. The BIS is activated by conflict, which might arise, for example, from ambiguous stimuli that co-activate two conflicting behavioral tendencies (Carver & White, 1994), i.e., tendencies to approach and actively avoid something. Thus, BIS activation often arises when a stimulus or situation is not clearly rewarding or threatening, or when it is both, attractive and repulsive. This results in the inhibition of behavior and the engagement in risk evaluation processes with the final purpose of deciding which behavior to undertake (Corr & Cooper, 2016). Researchers report that FFFS elicits fear and terror, whilst BIS anxiety (e.g., Corr & Cooper, 2016).
In what follows, these affective constructs are discussed in two steps. In a first step, each one of the three systems will be discussed more in detail in its own dispositional and especially affective aspects. In a second step, an overview of the current understanding of these affects is provided.
Approach-related affects. “Let’s go for it!”
The BAS regulates desire-related motivation (appetitive motivation; e.g., Franken, 2002; Carver & White, 1994). The engagement in goal directed behavior and the experience of positive feelings in hope of obtaining reward are indicators of BAS activation (Corr & Cooper, 2016). However, each individual might have different levels of the strength of that system (also referred to as BAS sensitivity; Carver & White, 1994), which might explain the individual differences in approach directed behaviors in the presence of reward cues. For example, higher BAS sensitivity is related to addictive behaviors (e.g., Franken, 2002; Kidd & Loxton, 2021) and bipolar disorders (e.g., Alloy et al., 2009). On the contrary, low BAS sensitivity predicts depression (McFarland et al., 2006).
Besides exploring how BAS sensitivity relates to clinical disorders (e.g., Chat et al., 2022), researchers (e.g., Greenaway et al., 2015; Harmon-Jones et al., 2016) have being exploring approach-related affects elicited by BAS activation. As already mentioned, these affects are indicators of the systems’ activation levels. The BAS can be activated in response to various stimuli, many of which are associated with goals. Moreover, while approaching a given goal, the BAS engages a number of relatively separate, although overlapping, processes (Corr, 2004) associated with different affective states that serve to maintain motivation across space/time (Corr & Cooper, 2016). At the early stages of these processes we can differentiate between ‘reward interest’ and ‘goal-drive persistence,’ whilst ‘reward responsivity’ and ‘impulsivity’ characterize the late stages of goal pursuit. Reward Interest concerns the initial motivation to seek out potentially rewarding places, objects, activities or people. Goal drive persistence relates to actively pursuing a desired goal after having identified it, especially when reward is not immediately available. Reward responsivity relates to excitement at doing things well, especially to rewarding stimuli associated with fulfilling sub-goal procedures. Lastly, Impulsivity relates to behaviors closer to the final biological reinforcer, which no longer entails planning or restraint of behavior. Similarly, Carver and White (1994) have described the affects experienced in the early stages of approaching a reward as “anticipatory pleasure” or “hope” and “high pleasure” or “joy” those at the latest stages of the overall process.
In line with these results (Carver & White, 1994; Corr & Cooper, 2016), Egloff et al. (2003) investigated how a number of positive affect subtypes changed during approach task, and proposed to differentiate these into Interest, Activation and Joy. Interest was high and stable throughout the study. Activation increased during the task and decreased afterwards; joy increased after the task (Egloff et al., 2003). Therefore, as interest seems to be a more stable than the other two, which change according to the process’ phase (Egloff, et al., 2003), it is likely to find an higher correlation between activation and interest as well as joy and interest. Although all the three affects should correlate positively and strongly with each other.
Moreover, it is likely to find an higher correlation between activation and the dimensions of the early stages of the process, joy and the late stages, and interest with both early and late.
Among the above mentioned affects, anger has also been claimed to be an approach-related affect (e.g., Cooper et al., 2017). Findings (e.g., Carver, 2004; Cooper et al., 2008; Khoshfetrat et al., 2022) have shown that high BAS sensitivity predicted expressing anger outwardly or even acting on it. Gomez and colleagues argued that this is because high trait BAS people’s anger results from the frustration of not achieving a goal. Therefore, expressing anger outwardly or behaving aggressively would represent an approach-oriented solution (Cooper et al., 2008). Nevertheless, an aggressive behavioral response might result from BAS as well as FFFS activation (Cooper et al, 2008). That is because such behavior might be a goal approach or predatory aggression, thus BAS oriented, or a defensive fight, thus FFFS oriented. Therefore, this research meant to explore whether anger (measured by STAXI self-report; Vagg & Spielberger, 1979) might be an indicator of the BAS activation system.
Fear-related affects. “Get me out of this place!”
The FFFS system mediates active avoidance of threats. Generally speaking, threatening stimuli that can simply be avoided elicit defensive behaviors of Flight and Active Avoidance (according to defensive distance or perceived threat); whilst those that cannot be easily avoided elicit behaviors of Fight and Freeze (Corr & Cooper, 2016). As with the BAS, some individuals have a more sensitive FFFS. For example, flight responses have been associated with panic disorders (e.g., Blanchard et al., 2001).
The FFFS is believed to mediate the emotion of fear, not anxiety (e.g., Corr & Cooper, 2016). Fear and anxiety have been demonstrated to be distinct entities (Perusini & Fanselow, 2015): a state of fear is sensitive to panicolytic drugs but not to those that are only anxiolytic and work with anxiety (e.g., McNaughton & Corr, 2004). Interestingly, these different drugs have specific effects on behaviors, which allowed researchers to distinguish the behavioral correlates of these two affects: fear operates when there is an active avoidance such as for example leaving a dangerous context; anxiety operates when for example cautiously entering a situation (approach behaviours that engages risk assessment) or when avoiding it (passive avoidance; Gray, 1977). Furthermore, fear is an automatic affective response to aversive stimuli; it is relatively inaccessible to cognitive control and dependent on a neural circuitry that includes the amygdala (Öhman & Mineka, 2001). Whereas actual threat elicits fear, potential threat (that is, the anticipation of aversive contexts or consequences) elicits anxiety (Crocq, 2017). Moreover, anxiety is accompanied by increased arousal, expectancy, autonomic and neuroendocrine activation as well as, of course, behavioral patterns. These adaptations allow us to cope with an adverse or unpredicted situation (e.g., Kaynak et al., 2022; Steimer, 2022). Following this line of thoughts, it is comprehensible why researchers (e.g., Öhman & Mineka, 2001; Corr & Cooper, 2016; Sylvers et al., 2011) doubt that it is possible to distinguish between fear and anxiety on the basis of affective self-report measures. For them, it is likely that via self-report we measure anxiety-related affect associated with the cognitive anticipation of a threat; whereas fear (as an immediate reaction to a present threat) is more easily measured via physiological measures (e.g., Castro-Toledo et al., 2017).
Anxious-related affects. “Watch out for danger!”
The BIS is responsible for the resolution of goal conflict in general (e.g., between BAS-approach and FFFS-avoidance; McNaughton & Corr, 2004). Activation of the BIS entails the inhibition of conflicting behaviors, the engagement of risk assessment processes, and the scanning of memory and the environment to help resolve concurrent conflict. Conflicts can be elicited by contexts including both reward and threat (i.e., both the BAS and the FFFS have been activated; Corr 2004). If reward outweighs threat, the BIS will resolve the conflict by engaging the BAS and inhibiting the FFFS, resulting in approach. If threat outweighs reward, the BIS will further activate the FFFS and inhibit the BAS, resulting in avoidance (Bijttebier et al., 2009). However, conflicts are not restricted to approach–avoidance conflicts: approach–approach conflicts and avoidance–avoidance conflicts can also occur (Bijttebier et al., 2009).
As mentioned, FFFS mediates fear and terror, whilst BIS anxiety (e.g., Heidari & Nemattavousi, 2021; Corr and Cooper, 2016). However, besides the motivational and behavioral distinction, the differentiation between these affects is still understudied. For this reason, it is fundamentally important to provide researchers with a psychometric measure to differentiate fear and anxiety, in order to better understand and research these affects. This is what Corr and Cooper pointed out in their paper developing and validating the Reinforcement and Sensitivity Theory of Personality Questionnaire (Corr & Cooper, 2016), highlighting this as a significant obstacle to research progress. Nevertheless, as far as we know, this research need has not been addressed yet.
Overview of the current understanding of anxious, fearful and approach-related affects
Individual differences in proneness to experience affects are related to different dispositional sensitivity in BIS, BAS and FFFS motivational systems (e.g., Baumann et al., 2007). Findings (e.g., Gross, 2013) suggest that differences in individual dispositional BIS, BAS and FFFS are associated not only with differences in the experience of affects but also in emotional regulation processes. Studies (e.g., Tull et al., 2010; Baumann et al., 2007) reveal significant associations between the dimensions of BIS, BAS, FFFS and emotional regulation. For example, BIS and FFFS are positively associated with difficulties in emotional regulations, whereas certain BAS dimensions such as Drive and Fun seeking are associated with adaptive emotional regulations (Tull et al., 2010). Emotional self-regulatory skills regard, among other things, the speed of entering and leaving an affective state, as well as the capability of self-motivation (Baumann et al., 2007). Furthermore, recent results (Merchàn-Clavellino et al., 2019) show the influence of BIS and BAS motivational systems on the experience of affects, and that this relationship is moderated by emotional intelligence.
Generally speaking, higher BAS and low BIS/FFFS-related affects might lead to greater job satisfaction (Moè et al., 2010), better choices of more effective learning strategies (De Beni & Moè, 2003), different reactions to gender sterotypes (Moè et al., 2021). On the contrary, higher BIS levels are related to depressive symptoms (e.g., Bryan et al., 2022; Wu et al., 2021; Li et al., 2015) and the use of maladaptive emotional regulation strategies (Bijttebier et al., 2009).
Although greater BAS sensitivity appears more often related to positive outcomes (e.g., Hu et al., 2022; Pulido et al., 2023), this is not always the case. For example, BAS impulsivity shows negative associations with self-control (Bacon & Corr, 2017). At the same time, it is likely that exercising self-control increases approach motivation. Also, BIS might be a component of self-control (Schmeichel et al., 2010). In line with these thoughts, because of the complex relationships between these three constructs (e.g., Kajdzik & Moroń, 2023; Strand, 2023, Włodarska et al., 2021), it is important to assess BIS, BAS and FFFS related affects through a combined measure of the three dimensions.
Aims and hypotheses
The first aim of our paper is to provide just such an instrument. To measure these three kinds of affects, different already existing affective self-report scales are used and combined in a newly developed affect self-report scale named the Reinforcement sensitivity theory affect questionnaire (RST-AQ). Secondary goal is to test the validity of the RST-AQ measure.
In order to test the validity of RST-AQ, the scale was hypothesized to show a satisfactory internal consistency, convergent validity (i.e., our BIS, BAS and FFFS subscales should be positively, significantly and at least moderately correlated with themselves and other affect scales measuring the same constructs) and divergent validity (i.e., our BIS and BAS subscales should correlate more strongly with measures of BIS and BAS traits, respectively, than with measures of a similar but different construct such as pessimism and optimism; Glaesmer et al., 2008).
Moreover, BAS, BIS and FFFS subscales were predicted to correlate positively, significantly and at least moderately with their matching counterparts, while correlating much lower with their non-matching counterparts. For example, our measure of BAS related-affects should correlate more strongly with measure of BAS trait, than with measures of BIS and FFFS trait.
Method and materials
Development of scale
Initially, quality criteria were established for assessing the adequacy of our RST-AQ.
First, the scale should assess the affects related to the activation of BIS, FFFS and BAS systems, as identified by the Reinforcement Sensitivity theory of Corr and Cooper (2016).
Second, the scale should have good psychometric properties in terms of internal consistency and convergent validity. Moreover, the scale should show some evidence for divergent validity.
In order to create a scale coherent with the first quality criterion, a pool of 24 items was developed. These items were selected following a deductive method (Boateng et al., 2018) for items generation: through literature review on affects and evaluation of existing measures (e.g.,Greenaway et al., 2015; Harmon-Jones, et al., 2016; Maack et al., 2015; Watson & Clark, 1999).
A first pool of items was generated. An iterative process of evaluation was then undertaken by researchers with expertise in the field, until consensus was reached on face validity. This resulted in a final pool of 24 items including 9 items from the PANAS-X (Watson & Clark, 1999) Positive Affect subscale for our BAS subscale; six items from the PANAS-X Fear subscale and two face valid items (worried and inhibited) for our BIS subscale; and five items from the FFFQ subscale (Maack et al.,; 2015). The items were scored on a 7-point Likert scale (from 0 = does not apply to me at all to 7 = does apply to me completely).
Sample
288 German-speaking participants (170 males; 143 females; M = 37.22 years; SD = 11.71) were recruited through the crowdsourcing platform Clickworker. The online survey was administered via LimeSurvey. The sample size was determined a-priori using an online calculator (https://www.danielsoper.com/statcalc/calculator.aspx?id=89). The only criterion for data exclusion from all analyses was failing the reading check. This was a question included at the end of the survey that could only be answered correctly if participants were reading the instructions carefully. As we anticipated that 20% of participants would fail the reading check, we initially recruited 346 participants (20% more participants than needed). Our prediction was confirmed. The study was preregistered (https://osf.io/jqwft/).
Procedure
Participants were asked to fill out a number of scales that measure both trait and state aspects of behavioural approach, behavioural inhibition and fight-flight-freeze system sensitivity (see Instruments Section). Also, they were presented with an instrument adopted to assess optimism and pessimism (Glaesmer et al., 2012). Lastly, they were asked about demographics (nationality, employment status, education level). As financial incentive, they received 2.25 € for participation.
Instruments
Once again, the Reinforcement sensitivity theory affect questionnaire is a newly developed measure of anxious, approach related and fearful affects, and its final version is composed of 22 items (see Appendix).
In what follows, the existing scales used in our study are reported, in the same order these were proposed to participants:
High Approach Scale (Greenaway et al., 2015). The scale measures feelings of high approach. Participants respond to the statement ‘right now I feel’, reporting the extent to which they feel energized, powerful, capable, and competitive on a scale from 1 = not at all to 7 = very much. The measure shows a satisfactory reliability level α = 0.78.
The BIS/BAS Scale (Carver & White, 1994). The measure includes one BIS subscale and three BAS-related subscales: reward responsiveness, drive, and fun seeking. Reward responsiveness’ items focuses on positive responses to the occurrence of anticipation of reward. Drive’s items regard the persistency in pursuing a desired goal. Fun seeking’s items focuses on both desire for new rewards and the willingness to approach a potential reward in the instant it arises. The scale consists of 20 items (e.g., BIS item: if I think something unpleasant is going to happen, I usually get pretty “worked up”; BAS Reward Responsiveness item: when I get something I want, I feel excited and energized) evaluated on a 4-point Likert scale with 1 indicating strong agreement and 4 indicating strong disagreement. The scale shows a satisfactory construct validity and internal consistency with reliabilities of α = 0.74 for BIS, α = 0.73 for BAS Reward Responsiveness, α = 0.76 for BAS Drive, α = 0.66 for BAS Fun Seeking.
State-Trait Anger Expression Inventory (STAXI; Spielberger et al., 1988). The scale provides a self-reported measure of the experience, expression and control of anger, including 44 items that score on a 4-point Likert scale. For our study we included only 10 items reflecting the experience of anger (e.g., I get angry quickly).
Reinforcement Sensitivity Theory Personality Questionnaire (RST-PQ; Corr & Cooper, 2016). RST-PQ includes 84 items (e.g., BIS item: I feel sad when I suffer even minor setbacks; BAS Reward Interest item: I get carried away by new projects; FFFS item: I sometimes wake up in a state of terror) rated on a 4-point Likert-style scale with the options 1 = ‚not at all’, 2 = ‘slightly’, 3 = ‘moderately’, 4 = ‘highly’. Psychometric properties of the RST-PQ were acceptable. Cronbach’s alpha values for FFFS, BIS, BAS Reward Interest, BAS Goal Drive Persistence, BAS Reward Reactivity, BAS Impulsivity were 0.78, 0.93, 0.75, 0.86, 0.78, 0.74.
The Fight, Flight, Freeze Questionnaire (FFQ; Maack et al., 2015). FFQ measures the construct of fear. It includes 21 items (e.g., petrified), evaluated on a 5-point Likert scale. The measure is reliable (α = 0.92).
Life Orientation Test Revised (LOT-R; Glaesmer, et al., 2012). The instrument is adopted to assess optimism and pessimism. It consists in 10 items, rated on a 5-point Likert scale, from strongly agree to strongly disagree. Cronbach’s alpha coefficients of reliability for optimism, pessimism and total score were 0.70, 0.74, and 0.68.
The Descrete Emotions Questionnaire (DEQ; Harmon-Jones, et al., 2016). DEQ is a short measure of basic emotions, including 8 subscales. Each measured by 4 items. For our study, we used the two subscales Anxiety and Fear (e.g., Anxiety items: worry, anxiety, dread, nervous; Fear items: terror, scared, fear, panic). Cronbach’s alpha values for Anxiety and Fear are 0.90 and 0.92.
Data analyses
In the first step, the internal consistency of the RST-AQ subscales (BIS, BAS, and FFFS) was investigated. Then, the factorial structure of the pool of 24 affects items was examined with an exploratory factor analysis using principal axis factoring and the Varimax with the Kaiser Normalization rotation method, using IBM SPSS Statistics from Window, version 27. In the second step, convergent and divergent validity were investigated by correlating the BIS, BAS, and FFFS subscales of the RST-AQ with (1) other measures of BIS, BAS and F FFS affect and (2) trait measures of BIS, BAS and FFFS. Lastly, correlations between the three subdimensions of BAS (Interest, Activation and Joy) were performed in order to investigate how these dimensions are related to each other.
Results and discussion
RST-AQ. Internal consistency and factorial validity
Internal consistency
The scale shows a good reliability. Cronbach’s alpha of BAS, BIS and FFFS is 0.88, 0.91, 0.89.
Exploratory factor analysis
Examination of the Eigenvalues and scree plot suggested a 3 factors solution. The first factor had an Eigenvalue of 9.35 and explained 38.95% of variance. The second and third factors had Eigenvalues of 3.74 and 1.76. They explained the 15.573% and 7.330% of the variance, respectively. The items that loaded positively on these three factors are displayed in Table 1. Their loadings ranged from 0.539 to 0.783. These values are regarded as sufficient to indicate that the three factors are reliable (Stevens, 2009). We excluded from the final list of items two items: endangered and attentive because their loadings’ difference on two different factors was less than 0.20. Cross-loadings of items can be observed for the FFFS factor. However, one suggested solution to the problem is to assign the items to the factor that it loads most highly on (Field, 2009; Henson & Roberts, 2006) which in our case would be FFFS. Moreover, Pett et al. (2003) suggest a cutoff score of 0.40 above which loadings are considered important. The BAS, BIS and FFFS subscales were highly internally consistent (see Table 1).
Confirmatory factor analysis
CFA was performed to test the three-factor model. The goodness of fit of the model was assessed considering the following fit indices: the overall model chi-square (χ2), CFI, root mean squared error of approximation (RMSEA), and standardized root mean square residual (SRMR). CFI values of 0.90 and above, and RMSEA and SRMR values of less than 0.08 are considered an acceptable fit (Hu & Bentler, 1999; Kline, 2005). Using these criteria for evaluation, the initial model fit for the three-factor model meet a common fit standard ( χ2 (206, n = 288) = 628.00, p < 0.001, CFI = 0.90, RMSEA = 0.08, SRMR = 0.07).
Convergent validity
Data shown in Tables 2 and 3 provide the correlations between our BAS, BIS and FFFS subscales with themselves and other affect scales measuring the same constructs (Table 2). Results show an overall support for convergent validity of the RST-AQ. As one might expect, in Table 2 the BAS subscale is negatively related to BIS and FFFS. However, BIS and FFFS are positively related to each other. Given previous studies, this is not surprising. There is a strong debate in the literature on the differences between fear and anxiety affects (e.g., Gray, 1977; Öhman & Mineka, 2001; Sylvers et al., 2011; Corr & Cooper, 2016). For example, anxiety disorders and panic attacks (an intense and immediate response of fear) respond to different pharmacological treatments (e.g., Ravindran & Stein, 2010; American Psychiatric Association, 2013). Among other things, this allows us to think that these two affective responses are different as there are different underlying neural mechanisms. Following this discussion, it is likely that via self-report we measure anxiety-related affects as this affects manifest itself with the cognitive anticipation of a threat, whereas fear (as an immediate reaction to a present threat) is more easily measured via physiological measures. In support of this, Castro-Toledo et al. (2017) found that via physiological measures, one can capture aspects of the emotion of fear (heart rate) that are not reflected in data collected through self-report measures. Furthermore, results in Table 2, show us that our subscales are positively related to the respective subscales of the other existing measures, thus supporting convergent validity.
RST-AQ and other instruments
Divergent validity
Results show at last some evidence for divergent validity with regard to the RST-AQ BIS subscale. This subscale correlates 0.45 with pessimism (Glaesmer et al., 2008), and 0.59 with RST-PQ BIS. Although small, these differences provide some evidence to support divergent validity. In the case of BAS, the evidence for divergent validity is poor, as our BAS subscale do not correlate with the RST-PQ BAS scores more than with optimism and extraversion scores (Glaesmer et al., 2008).
Relationships between trait and affective measures
Table 3 provides the correlations between the RST-AQ subscales and the RST-PQ scale (Corr & Cooper, 2016).
The BAS and BIS subscales of the RST-AQ moderately correlate with their matching counterparts, while correlating much lower with their non-matching counterparts (e.g., BAS trait – BIS state), thus providing evidence for convergent and divergent validity.
This is not the case with the RST-AQ FFFS subscale.
Although it hardly correlate with trait BAS, which suggests that the RST-AQ FFFS subscale possesses divergent validity in the sense that it can be separated from BAS, it does not possess that divergent validity when it comes to separating it from trait BIS. Because it even correlates better with trait BIS than with trait FFFS, albeit only slightly so, it seems to be more informative about BIS than about FFFS activation. Ironically, the RST-AQ BIS subscale is correlated slightly higher with the RST-PQ BIS scale, indicating that the RST-AQ BIS scale surpasses the RST-AQ FFFS as an indicator of FFFS.
However, these results reflect Corr and Cooper’s previous results (2016). In fact, the RST-PQ scale is also not sensitive enough in discriminating between BIS and FFFS. Obviously, as our RST-AQ scale is based on the RST-PQ, these results could be expected.
Moreover, the similarity between BIS and FFFS, both traits and affects, should be further explored in the future. It is possible that these measures do not discriminate enough not because they lack of sensitivity but due to similarities in nature between the dimensions of BIS and FFFS.
Furthermore, additional correlations were run to explore whether angry affect, as measured with the STAXI (Spielberger, 1988), is related to trait BAS sensitivity and whether a relationship exists between anger and approach-related affects. The correlation between anger and approach-related affects was negative (r = -0.22). On the contrary, anger was found moderately and positively correlated with BIS (r = 0.45) and FFFS (r = 0.41) affect measures. In conclusion, these findings suggest that anger and positive affects are weakly and negatively correlated. On the contrary, these results suggest that anger is related to anxiety and fear more than to positive approach-related affect it is often argued to relate to.
Three dimensions of BAS affect
Correlations between the dimensions of BAS
As mentioned in the theoretical framework, we were also interested in expanding the extant research on the dimensions of approach-related affects. For this reason, we examined the relationships between the three dimensions of our BAS subscale: Joy, Interest, Activation (Egloff et al., 2003). Joy includes the items excited, proud, and enthusiastic; interest includes the items interested, strong and determined; Activation includes the items active, alert, attentive and inspired. Results showed that the three dimensions are highly and positively related to each other. However, the correlations between interest and activation (r = 0.73), and interest and joy (r = 0.71) are higher than the correlations between joy and activation (r = 0.65). These results are in line with our hypothesis that Interest should correlate higher with Activation and Joy than these two dimensions correlate with each other. And that is because Interest seems a more stable and dispositional dimension; whereas the other two dimensions are more changeable according to the phase of goal pursuit processes (Egloff et al., 2003). Moreover, as displayed in Table 4, we investigated the relationships between the three dimensions of our BAS subscale and the different BAS subscales of the trait RST-PQ (Reward interest, goal-drive persistence, reward reactivity, impulsivity; Corr & Cooper, 2016). In line with our expectations, results show that activation is positively related with both of the early stages of Reward Interest and Goal-drive persistence; joy is related to the late stage of Reward Responsivity and slightly but significantly with Impulsivity; interest with the early stages of Goal-drive persistence, Reward Interest, and moderately with the late stage of Reward Responsivity.
Furthermore, unexpectedly joy is positively related to the early stage of Reward Interest.
Discussion
The RST-AQ is a newly developed scale measuring approach-related, anxious and fearful affect. The scale shows good construct validity, and its BAS and BIS subscales also show good convergent validity. Nevertheless, the scale seems not sensitive enough to discriminate well between anxious and fearful affects, as the scores of the two subscales are positively related with each other. That might be because self-report measures are more suitable for measuring anxiety rather than fear. As mentioned before, there is a strong debate about the differences between fear and anxiety (e.g., Daniel-Watanabe & Fletcher, 2022). Fear consists of an immediate physiological response to proximal threatening stimulus; whilst anxiety is an emotional response to the psychological anticipation of adverse scenarios (Gray, 1977; Öhman, et al., 2001; Sylvers et al., 2011; Corr & Cooper, 2016). Moreover, some researchers argue that fear is stimulus-specific, whilst anxiety has a diffuse nature (Gullone et al., 2000). In line with this debate, it seems logic wondering whether fear is easily measured via physiological measures, instead of self-report measures (e.g., Öhman et al., 2001; Corr & Cooper, 2016; Sylvers et al., 2011). It is likely that via self-report one measures anxiety-related affect associated with the cognitive anticipation of a threat; whereas fear (as an immediate reaction to a present threat) is more easily measured via physiological measures (e.g., Castro-Toledo et al., 2017). In our survey, it is possible that participants were reporting anxiety-related affects also when they were asked about fearful affects. Further studies are needed to better disentangle these affects.
Correlations between trait and affective measures also provided evidence for convergent validity. The BIS subscale of the RST-AQ was moderately and positively related to trait BIS; the BAS subscale of the RST-AQ was related positively but slightly to trait BAS. Only the FFFS subscale of the RST-AQ failed the tests for convergent and divergent validity. Furthermore, it was also explored whether anger was related to approach, fearful or anxious related affects. As shown in our data, angry affect is related to anxious and fearful affect (e.g., Khoshfetrat et al., 2022; McGarry & Shortland, 2023). This suggests that anger (together with anxiety and fear) is an affect experienced as indicator of BIS or FFFS activation. Before drawing strong conclusions about the relationships between anxiety, positive affect and anger, and their relationship to approach motivation, we should explore some possible explanations for our finding that anger was positively related to BIS and FFFS yet negatively related to BAS. One explanation is that people’s cognitions about themselves and others influence affective self-reports. In fact self-report measures are sensitive to social desirability. This may be particularly true for anger because anger is not always a socially accepted emotion (e.g., Ramtahal, 2017) and this might discourage people from reporting their experience of anger. This would suggest to explore anger further in an experimental design that comprises prevention and detection of social desirability methods or indirect questioning, which are also valid measures employed to reduce social desirability biases (Nederhof, 1985; Fisher and Katz, 1993; Weydmann et al., 2020). A second possible explanation might be that a person who scores higher on positive affect might experience anger but report the experience as feeling energized. This is because physiological arousal occurs before the cognitive process of labeling of the emotions occurs. In particular, Schacter-Singer Theory suggests that similar physiological responses can be labeled as different emotions, depending on the internal and external context this activation occurs in (Schachter & Singer, 1962; Schachter, 1964, 1980). Participants might mislabel anger as feeling energized. Feeling energized is one of the approach-related affects measured by BAS state scales. According to Schachter-Singer Theory, having already reported experiencing positive affect would function as a context to interpret the physiological activation of anger as a symptom of positive affect. On the contrary, if labeling the physiological state as anger, participants might experience cognitive dissonance (Festinger, 1980). This may happen if one person might report experiencing positive affect, and feel discomfort when having to report the experience of anger at the same time. In other words, participants might label their own physiological activation differently depending on their general affective experience. One person who scores higher in positive affects might label this physiological activation “feeling energized” as feeling energized is one of the approach related affects measured by BAS state scales; whilst another person who scores higher in BIS related affects might call the same physiological activation “anger”. In order to explore further these relationships between anger and approach-related affects/traits, physiological measures are needed.
Limitations and future avenues
This line of thoughts brings us to the limitations of our study. First, our study is a self-report survey. Self-report measures, as mentioned above, are influenced by social desirability (Ramtahal, 2017). Second, our study would benefit of an integration with an experimental design that can measure the physiological responses as well as the cognitive process of labeling these physiological activations. Third, in the present study participants are asked to indicate how they generally feel, instead of how they feel right now. Asking how they feel right now, might be more sensitive in capturing the transitory affective state of people.
Furthermore, although the sample size of our study was determined a-priori using an online calculator (https://www.danielsoper.com/statcalc/calculator.aspx?id=89); future studies exploring BIS, BAS and FFFS states would benefit of recruiting more participants for a bigger sample.
However, in spite of these limitations, the RST-AQ measure is, as far as we know, the first instrument that provides researchers with a scale to measures approach, anxiety and fearful related affects.
Research implications
The manuscript has at least two research implications. First, it serves researchers investigating the field of affects with the first validated instruments on the approach, fearful, anxious related affects. Especially given the number of studies revealing the importance of the dimensions of BIS, BAS and FFFS in the emotional regulation processes and emotional intelligence (e.g., Tull et al., 2010; Baumann et al., 2007). Second, it contributes to the extant knowledge on affects, further exploring the relationships between BAS, BIS, FFFS-related affects, the subdimensions of BAS, and the relationships between anger and BAS, BIS and FFFS states.
Conclusions
In this paper, it is reported the validation of a newly developed self-report measures. The RST-AQ provides researchers with one comprehensive and simplified instruments for BIS, BAS and FFFS states. This scale is created using different existing self-report scales on affects and combining them in our newly developed affect self-report scale.
Furthermore, we investigated whether trait measures of the three systems are related to anxious, approach-related and fearful affects. Our aim was to extend the extant literature of BIS, BAS and FFFS related affects, providing researchers with one self-report measure to investigate this topic further. This is extremely important because RST, besides being a theory of personality traits and motivational states, is a theory of emotional states of people. Moreover, so far there was no existing self-report measure researchers could use to assess affects. Hopefully, this study might lay the groundwork for future studies in the field of RST emotional states of people.
However, BIS, BAS, and FFFS states should be explored further using both self-report measures and physiological measures in order to fully disentangle and understand these constructs.
Data availability
The datasets generated and analysed during the current study are available from the corresponding author on reasonable request.
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Open access funding provided by Austrian Science Fund (FWF). The study was supported by the Doctoral College “Imaging the Mind” (FWF; W1233-B). The authors have no competing interests to declare that are relevant to the content of this article.
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Appendix
Appendix
RST-AQ Measure
Now we would like you to tell us how you generally feel. The following words describe different feelings and sensations. Read each word and then write the intensity in the scale next to each word. You have the option of choosing from seven gradations (Does not apply to me at all = 0; Does apply to me completely = 7). Please indicate how you generally feel.
BAS affects
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active
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alert
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determined
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enthusiastic
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excited
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inspired
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interested
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proud
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strong
BIS affects
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afraid
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scared
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frightened
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nervous
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jittery
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shaky
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worried
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inhibited
FFFS affects
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horrified
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terrified
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petrified
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startled
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shocked
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Franchina, V., Klackl, J. & Jonas, E. The reinforcement sensitivity theory affects questionnaire (RST-AQ). A validation study of a new scale targeting affects related to anxiety, approach motivation and fear. Curr Psychol 43, 5193–5205 (2024). https://doi.org/10.1007/s12144-023-04623-z
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DOI: https://doi.org/10.1007/s12144-023-04623-z