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Response activation in overlapping tasks and the response-selection bottleneck.

Torsten Schubert1, Rico Fischer, Christine Stelzel

  • 1Department of Psychology, Humboldt-University Berlin, Germany. torsten.schubert@psychologie.hu-berlin.de

Journal of Experimental Psychology. Human Perception and Performance
|April 2, 2008
PubMed
Summary

Response activation impacts dual-task performance by influencing reaction times in Task 2, particularly when tasks involve crosstalk. This effect occurs at prebottleneck stages, not postbottleneck stages, during the psychological refractory period (PRP).

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Factors

Background:

  • The psychological refractory period (PRP) task is a standard paradigm for studying dual-task performance.
  • Previous research has explored various factors influencing the PRP effect, including attention and processing capacity.

Purpose of the Study:

  • To investigate the role of response activation in modulating dual-task performance within the PRP paradigm.
  • To determine whether response activation affects prebottleneck or postbottleneck processing stages.

Main Methods:

  • Participants completed a PRP task involving two tasks presented sequentially.
  • A subliminal prime, congruent or incongruent with Task 2 stimulus, was presented before Task 2 stimulus onset.
  • Stimulus onset asynchrony (SOA) and task crosstalk conditions were manipulated.

Main Results:

  • Task 2 reaction times were modulated by prime-stimulus congruence at short SOAs, despite the PRP effect.
  • Congruence effects were observed in both Task 1 and Task 2, but only under crosstalk conditions.
  • No congruence effects were found when crosstalk was prevented.

Conclusions:

  • Response activation influences dual-task performance during the PRP, specifically affecting Task 2 response times.
  • The findings suggest that response activation operates via crosstalk between common processing elements at prebottleneck stages.
  • Response activation does not appear to directly impact postbottleneck stages in dual-task scenarios.