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A Dual Task Procedure Combined with Rapid Serial Visual Presentation to Test Attentional Blink for Nontargets
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Dual-target interference for the 'automatic pilot' in the dorsal stream.

Brendan D Cameron1, Ian M Franks, James T Enns

  • 1School of Human Kinetics, University of British Columbia, 6081 University Blvd, Vancouver, BC, Canada.

Experimental Brain Research
|March 22, 2007
PubMed
Summary

The brain's "automatic pilot" guiding hand movements is less effective with multiple targets. Interference from multiple visual inputs reduces the dorsal stream's ability to guide actions online.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Cognitive Psychology

Background:

  • The posterior parietal cortex (PPC) in the dorsal visual stream is implicated in automatic hand movements following target displacement.
  • Previous research suggests the PPC acts as an 'automatic pilot' for aiming movements.

Purpose of the Study:

  • To investigate the limits of automaticity within the dorsal stream.
  • To determine how multiple targets affect the automatic guidance of hand movements.

Main Methods:

  • Participants performed rapid aiming movements to one or two sequential targets.
  • Target jumps occurred unpredictably at movement onset in 30% of trials.
  • Hand movement responses to target jumps were analyzed in single-target and dual-target conditions.

Main Results:

  • Hand movements showed reduced responsiveness to target jumps in the dual-target condition compared to the single-target condition.
  • This suggests that automatic pilot function is impaired when processing multiple visual inputs.

Conclusions:

  • The dorsal stream's online action guidance is less effective when multiple targets are attended.
  • Automaticity in motor control is susceptible to interference from competing visual information.