Psychonomic Bulletin & Review

, Volume 8, Issue 1, pp 73–80

Processing bottlenecks in dual-task performance: Structural limitation or strategic postponement?

  • Eric Ruthruff
  • Harold E. Pashler
  • Alwin Klaassen
Brief Reports

DOI: 10.3758/BF03196141

Cite this article as:
Ruthruff, E., Pashler, H.E. & Klaassen, A. Psychonomic Bulletin & Review (2001) 8: 73. doi:10.3758/BF03196141
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Abstract

Recent evidence indicates that a central bottleneck causes much of the slowing that occurs when two tasks are performed at the same time. This bottleneck might reflect a structural limitation inherent in the cognitive architecture. Alternatively, the bottleneck might reflect strategic (i.e., voluntary) postponement, induced by instructions to emphasize one task over the other. To distinguish structural limitations from strategic postponement, we examine a new paradigm in which subjects are told to place equal emphasis on both tasks and to emit both responses at about the same time. An experiment using this paradigm demonstrated patterns of interference that cannot easily be attributed to strategic postponement, preparation effects, or conflicts in response production. The data conform closely to the predictions of structural central bottleneck models.

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Copyright information

© Psychonomic Society, Inc. 2001

Authors and Affiliations

  • Eric Ruthruff
    • 1
  • Harold E. Pashler
    • 2
  • Alwin Klaassen
    • 2
  1. 1.NASA Ames Research CenterMoffett Field
  2. 2.University of CaliforniaSan Diego