Abstract
Participants presented with auditory, visual, or bimodal audiovisual stimuli in a speeded discrimination task, fail to respond to the auditory component of bimodal targets significantly more often than to the visual component, a phenomenon known as the Colavita visual dominance effect. Given that spatial and temporal factors have recently been shown to modulate the Colavita effect, the aim of the present study, was to investigate whether semantic congruency also modulates the effect. In the three experiments reported here, participants were presented with a version of the Colavita task in which the stimulus congruency between the auditory and visual components of the bimodal targets was manipulated. That is, the auditory and visual stimuli could refer to the same or different object (in Experiments 1 and 2) or audiovisual speech event (Experiment 3). Surprisingly, semantic/stimulus congruency had no effect on the magnitude of the Colavita effect in any of the experiments, although it exerted a significant effect on certain other aspects of participants’ performance. This finding contrasts with the results of other recent studies showing that semantic/stimulus congruency can affect certain multisensory interactions.
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Notes
Frick (1995) has argued that one cannot confidently accept the null hypothesis when the P value is in the range from 0.200 to 0.500, but if the P value is greater than 0.500, he argues that this provides one important criterion for accepting the null hypothesis.
Observed power is the probability of correctly rejecting a false statistical null hypothesis (Type II error; the probability of a Type II error is referred to as β) and is equal to 1 − β. Thus, while a low P-value and a high observed power would provide support for the H1 hypothesis, a P-value above 0.500 and a low observed power would be evidence supporting the null hypothesis (Frick 1995).
Fourteen naïve participants took part in this control study. The apparatus, materials, design, and procedure were exactly the same as in Experiment 1 with the sole exception that the experimental stimuli now consisted of pictures and sounds of cats and phones (rather than of cats and dogs as used in Experiment 1). The data from the bimodal trials in which the participants failed to respond to one of the stimuli were analysed using an ANOVA with the factors of Response (Auditory-only or Visual-only) and Target Congruency (Congruent or Incongruent). The analysis of the error data revealed a significant main effect of Response [F(1, 13) = 12.00, P = 0.004], attributable to participants making significantly more visual-only than auditory-only responses (21.3 vs. 8.2% of all bimodal trials, respectively); once again demonstrating a Colavita effect. The analysis of the error data also revealed a significant main effect of Target Congruency [F(1, 13) = 10.64, P = 0.006], attributable to participants making significantly more errors when the auditory and visual components of the bimodal stimuli were congruent (16.4% errors) than when they were incongruent (13.1% errors). Crucially, however, there was no interaction between Response and Target Congruency [F(1, 13) = 1.47, P = 0.247]. Hence, once again, no effect of semantic congruence on the magnitude of the Colavita effect was observed.
It should be noted that the task that participants had to perform could also be considered to be an identification task (where participants discriminate which modality a target is presented in). Quite what is the most appropriate description for the task is ambiguous, as participants were both detecting stimuli in different modalities, and discriminating which modality a target was presented in.
Ten naïve participants took part in this control study. The apparatus, materials, design, and procedure were exactly the same as in Experiment 1 with the sole exception that the participants were now instructed to press one key in response to cats and another key in response to dogs. Thus, for the congruent bimodal trials, the participants only had to press one key (a single-response trial). Whenever an incongruent bimodal stimulus (containing both a cat and a dog target) was presented, the participants were explicitly instructed to press both response keys (a two-response trial). The data from the incongruent bimodal trials in which the participants failed to respond to one of the two stimuli were analysed using an ANOVA with the factors of Response (Auditory-only or Visual-only) and Auditory Stimulus (Cat or Dog). The analysis revealed a significant main effect of Response [F(1, 9) = 8.27, P = 0.010], with participants making significantly more visual-only than auditory-only responses (19.2 vs. 9.1% of all bimodal trials, respectively), thus demonstrating a robust Colavita visual dominance effect. None of the other terms in this analysis of the error data reached significance [both Fs < 1, n.s.]. The RT data from those trials in which only a single response was required were analysed using an ANOVA with the factor of Stimulus Type (Auditory, Visual, or Bimodal) and revealed a significant main effect [F(2, 18) = 17.95, P < 0.001]. Participants responded more rapidly to bimodal targets (512 ms) than to either auditory (570 ms; t(9) = 5.59, P < 0.001) or visual targets (539 ms; t(9) = 3.84, P = 0.004), and more rapidly to visual than to auditory targets (t(9) = 2.79, P = 0.021). Finally, an ANOVA performed on the bimodal congruent and incongruent RT data with the factors of Semantic Congruency (Congruent or Incongruent) revealed a significant main effect [F(1, 9) = 38.92, P < 0.001], with participants responding significantly more rapidly to congruent (539 ms) than to incongruent targets (712 ms).
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Acknowledgements
C. K. was supported by a Departmental Studentship from the Department of Experimental Psychology, University of Oxford. Correspondence regarding this article should be addressed to C. K., at the Department of Experimental Psychology, University of Oxford, South Parks Road, Oxford, OX1 3UD. E-mail: camille.koppen@psy.ox.ac.uk.
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Koppen, C., Alsius, A. & Spence, C. Semantic congruency and the Colavita visual dominance effect. Exp Brain Res 184, 533–546 (2008). https://doi.org/10.1007/s00221-007-1120-z
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DOI: https://doi.org/10.1007/s00221-007-1120-z