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Related Experiment Videos

Concurrent counting and typing: lateralized interference depends on a difference between the hands in motor skill.

Merrill Hiscock1, Jerome S Caroselli, Stacey Wood

  • 1Department of Psychology, University of Houston, Houston, TX 77204-5022, USA. mhiscock@uh.edu

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|March 3, 2006
PubMed
Summary

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Manual skill asymmetry, not just hand preference, impacts dual-task performance. Faster hands experience more interference, suggesting manual asymmetry influences cognitive task interaction.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Factors

Background:

  • Previous dual-task studies confounded hand preference with manual skill asymmetry.
  • Lateralized interference in concurrent-task paradigms requires disentangling these factors.

Purpose of the Study:

  • To investigate whether manual skill asymmetry or hand preference primarily causes lateralized interference in dual-tasking.
  • To determine the relationship between baseline manual asymmetry and dual-task interference patterns.

Main Methods:

  • Forty-eight adults performed a cognitive task (backward counting) concurrently with a manual task (typing).
  • Participants typed easy/difficult sequences with their preferred or non-preferred hand.
  • Hand preference and baseline manual asymmetry were analyzed as independent factors.

Related Experiment Videos

Main Results:

  • Grouping by hand preference showed symmetric slowing for both left- and right-handers.
  • Grouping by manual asymmetry revealed greater cognitive interference with the faster hand.
  • Baseline typing rate did not affect dual-task interference.
  • Left-hand preference and superiority were linked to reduced cognitive interference, indicating looser task coupling.

Conclusions:

  • Baseline manual asymmetry, rather than hand preference, is a key determinant of lateralized dual-task interference.
  • The degree of asymmetry in manual skill influences the interaction between cognitive and motor tasks.
  • Findings support the role of manual asymmetry in modulating dual-task interference patterns.