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Does so-called interhemispheric transfer time depend on attention?

C M Braun1, S Daigneault, A Dufresne

  • 1Département de Psychologie, Université du Québec à Montréal, Canada.

The American Journal of Psychology
|January 1, 1995
PubMed
Summary
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Researchers found that attention cuing can alter interhemispheric transfer time (CUD), but only under specific conditions. This suggests that attention influences the motor component of information transfer between brain hemispheres.

Area of Science:

  • Cognitive Neuroscience
  • Psychology

Background:

  • The crossed-uncrossed differential (CUD), or interhemispheric transfer time, has been difficult to experimentally modulate.
  • Previous attempts to alter CUD have largely failed.

Purpose of the Study:

  • To investigate if attention, specifically lateralized cuing, can modulate CUD.
  • To determine if CUD is significant under normal attentional constraints.
  • To examine the conditions under which CUD can be altered.

Main Methods:

  • Four experiments were conducted using visual reaction time tasks.
  • Probabilistic cuing (valid and invalid) was used to manipulate attention to target location.
  • Baseline CUD was measured under normal attentional constraints.

Related Experiment Videos

Main Results:

  • A significant CUD was observed in the baseline experiment.
  • Probabilistic cuing rendered CUD nonsignificant in Experiments 2-4.
  • A significant complex dissociation of CUD was found in Experiment 3, dependent on cuing type and stimulus onset asynchrony.

Conclusions:

  • The CUD can be modulated by target location cuing, but only under specific circumstances.
  • The findings suggest that attention primarily influences the postcallosal motor component of interhemispheric transfer.