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Simultaneous dual-task performance reveals parallel response selection after practice.

Eliot Hazeltine¹, Donald Teague, Richard B Ivry

¹National Aeronautics and Space Administration (NASA) Ames Research Center, Moffett Field, California 94035, USA. ehazeltine@mail.arc.nasa.gov

Journal of Experimental Psychology. Human Perception and Performance

|June 22, 2002

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With practice, individuals can perform two tasks simultaneously without interference, suggesting tasks do not share a response selection bottleneck. This challenges previous theories on dual-task performance limitations.

Area of Science:

Cognitive Psychology
Human Performance
Experimental Psychology

Background:

Previous research indicated minimal dual-task costs with practice and equal task emphasis.
The concept of a response selection bottleneck suggests a limit on processing two tasks simultaneously.

Purpose of the Study:

To investigate if extensive practice eliminates dual-task costs by overcoming a response selection bottleneck.
To determine if trained dual-task performance is compatible with an efficient bottleneck model.

Main Methods:

Participants underwent extensive training to perform two tasks concurrently without interference.
Experiments involved manipulating stimulus novelty, relative task onsets, and response selection durations.
Reaction times were measured to assess dual-task costs.

Related Experiment Videos

Main Results:

Novel stimulus pairs did not produce reaction time costs, refuting stimulus-response association development.
Variations in response selection timing (onset and duration) did not induce dual-task costs.
Participants achieved interference-free performance on both tasks after training.

Conclusions:

Extensive practice allows for dual-task performance without interference.
The findings suggest that the two tasks do not share a common bottleneck after sufficient training.
This challenges the universality of the efficient response selection bottleneck model in dual-tasking.