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Dual-Task Performance with Simple Tasks

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Handbook of Human Multitasking

Abstract

The present chapter focuses on a basic science perspective on dual-task performance with simple tasks. We will discuss how the investigation of dual-task performance with simple tasks, when based on a discrete processing-stage assumption, allows for the examination of dual-task costs at the microstructure of task component processing and offers a window into the nature of dual-task costs. The first part of the chapter will start with a brief overview of traditional approaches to studying dual-task performance with an emphasis on experimental approaches that manipulate the degree of temporal task overlap to assess cognitive processing limitations (psychological refractory period approach) as well as two techniques that allow to localize specific cognitive processes in reference to the assumed processing limitation (locus of slack and effect propagation logic). In the second part of the chapter, we will review research on processing interactions between two tasks as a major contribution of limitations in dual-task performance and discuss compatibility-based and no-go-based backward crosstalk as two qualitatively different types of between-task interference pattern. Finally, we highlight the possibility of instruction-based and contextual regulation of cognitive control as the basis for adaptive dual tasking.

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Notes

  1. 1.

    The locus of the capacity limited processing stage has been an important question in the PRP literature, and conceptions of peripheral (e.g., motor locus) or multiple bottlenecks have been put forward (Bratzke et al. 2009; De Jong 1993; Karlin and Kestenbaum 1968; Keele 1973).

  2. 2.

    Note that the proposal of latent bottlenecks as a consequence of extensive practice (Ruthruff et al. 2003) is in line with the RSB model to explain dual-task cost reductions. Similarly, optimized attention allocation between tasks, automatization, and increased information processing speed, as well as improved executive control skills, have been proposed to account for dual-task cost reduction after practice and are also well in line with capacity sharing and control models of dual-task performance (for a recent review, see Strobach and Schubert 2017).

  3. 3.

    The term “central” is an umbrella term that has its roots in the discrete stage logic of information processing and is meant to represent cognitive processing that should be distinguished from more peripheral perceptual and motor processing. Although the majority of studies with PRP experiments, cognitive processing at a “central” stage is not limited to response selection processes, but as aforementioned entails, among others, also various memory processes such as encoding, consolidation, or retrieval.

  4. 4.

    For recent neural network approaches for modeling dual-task costs on the basis of shared or multiple use of representations, see Feng et al. (2014) and Musslick and Cohen (Musslick and Cohen 2019; Musslick and Cohen 2021).

  5. 5.

    The aim of localizing the compatibility-based BCE at either an automatic response activation or a subsequent capacity-limited response selection stage rests on the assumption of distinct and separable processing stages. Indeed, figural illustrations often show a distinct response activation stage that is followed by a subsequent response selection stage (e.g., Lien and Proctor 2002; Schubert et al. 2008). However, one may also think of response selection as a processing stage that entails two processes that start at the same time. A fast and automatic response activation process accumulates evidence in favor of a certain response. A slower response identification process verifies the correctness of the accumulated evidence and needs to intervene if the activated response does not match the required response (see Kornblum et al. 1990). Importantly, response activation and response identification do not necessarily form separable subsequent processing stages in that conception, but their interplay determines the duration of response selection.

  6. 6.

    While many studies demonstrated (or at least assumed) that the experience of between-task interference triggers sequential modulations of the BCE, it is important to note that such sequential modulations were also observed when half of the previous trials did not provide a typical experience of between-task interference. Schonard et al. (2020), for example, reported sequential modulations of the BCE when the previous trial had a long SOA (i.e., 1000 ms). This is particularly interesting, because at such long SOAs, critical stages usually do not temporally overlap, and thus, no between-task interference should occur. The fact that sequential modulations of the BCE were nevertheless observed calls the immediate experience of between-task interference as the sole explanation of sequential modulations into question.

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Correspondence to Rico Fischer .

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Fischer, R., Janczyk, M. (2022). Dual-Task Performance with Simple Tasks. In: Kiesel, A., Johannsen, L., Koch, I., Müller, H. (eds) Handbook of Human Multitasking. Springer, Cham. https://doi.org/10.1007/978-3-031-04760-2_1

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