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      The source of execution-related dual-task interference: motor bottleneck or response monitoring?

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          Abstract

          The present study assessed the underlying mechanism of execution-related dual-task interference in the psychological refractory period (PRP) paradigm. The motor bottleneck hypothesis attributes this interference to a processing limitation at the motor level. By contrast, the response monitoring hypothesis attributes it to a bottleneck process that not only selects the appropriate response but also monitors its execution. In two experiments, participants performed ballistic movements of different distances in Task 1 and a choice reaction time task in Task 2. In each experiment, a propagation effect of movement distance on reaction time in Task 2 indicated substantial execution-related interference. To determine the locus of this effect, we manipulated stimulus-response compatibility in Task 2. In line with the motor bottleneck hypothesis, the compatibility effect was partially absorbed during movement execution of Task 1. The results support a motor bottleneck mechanism rather than response monitoring as the source of execution-related dual-task interference.

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          Author and article information

          Journal
          J Exp Psychol Hum Percept Perform
          Journal of experimental psychology. Human perception and performance
          American Psychological Association (APA)
          1939-1277
          0096-1523
          Oct 2009
          : 35
          : 5
          Affiliations
          [1 ] Department of Cognitive and Biological Psychology, University of Tübingen, Tübingen, Germany. daniel.bratzke@uni-tuebingen.de
          Article
          2009-17804-011
          10.1037/a0015874
          19803646
          c4bf199f-1f2a-4d00-87eb-2ea1e78dff52
          PsycINFO Database Record (c) 2009 APA, all rights reserved.
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