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Performing the hand laterality judgement task does not necessarily require motor imagery.

Akira Mibu1,2, Shigeyuki Kan3, Tomohiko Nishigami1,4

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Motor imagery is not universally used for the hand laterality judgment task (LJT). Our study found that at most 50% of participants showed motor imagery behavioral features, suggesting alternative strategies may be employed.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Motor Control

Background:

  • The laterality judgment task (LJT) is often assumed to involve motor imagery.
  • Recent research questions the necessity of motor imagery for LJT completion.

Purpose of the Study:

  • To investigate the prevalence and necessity of motor imagery in performing the LJT.
  • To determine if individuals preferentially use motor imagery for hand laterality judgments.

Main Methods:

  • Assessed behavioral markers of motor imagery (linear angle-RT relationship, biomechanical constraints effect) at the individual level.
  • Compared these markers in the LJT and a same-different judgment task (SDJT) across palmar and dorsal hand image views.
  • Studied 37 healthy adult participants.

Main Results:

  • At most 50% of participants exhibited both key motor imagery behavioral features in the palmar view LJT.
  • This proportion was not significantly different from the dorsal view LJT or the SDJT.
  • Findings suggest motor imagery is not a universally or specifically employed strategy for the LJT.

Conclusions:

  • The reliance on motor imagery for the LJT is not universal among healthy adults.
  • Previous interpretations of LJT results, especially concerning biomechanical constraints, may require re-evaluation.
  • Individual differences in strategy use should be considered in future LJT research.