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An intermanual advantage for tactual matching

J L Bradshaw1, M E Nicholls, M A Rogers

  • 1Department of Psychology, Monash University, Clayton, Australia.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|January 1, 1999
PubMed
Summary

Sharing tactile tasks between hands (intermanual) is more efficient than using one hand (intramanual). This bilateral processing speeds up tactile matching, especially for complex difference judgments.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Human Motor Control

Background:

  • Previous research presents conflicting findings on whether performing tactile tasks with one hand (intramanual) or both hands (intermanual) yields better performance.
  • Intramanual advantages are linked to intrahemispheric processing, while intermanual benefits are attributed to interhemispheric load sharing.

Purpose of the Study:

  • To investigate the impact of intermanual versus intramanual conditions on tactile performance.
  • To determine if sharing processing load between cerebral hemispheres enhances tactile discrimination efficiency.

Main Methods:

  • A group of 72 right-handed subjects performed a tactile matching task involving same/different discriminations.
  • Performance was compared between intramanual (one hand) and intermanual (both hands) conditions.

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Main Results:

  • Faster completion times were recorded for the intermanual condition compared to the intramanual condition, indicating greater efficiency.
  • The intermanual advantage was more pronounced for difference judgments, suggesting increased processing demands.
  • No left-hand advantage was observed for this specific tactile matching task.

Conclusions:

  • Sharing tactile processing load across both cerebral hemispheres (intermanual) leads to more efficient task completion than using a single hand (intramanual).
  • Bilateral processing appears beneficial for tactile discrimination, particularly when tasks require greater cognitive resources.