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Related Experiment Video

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The "Motor" in Implicit Motor Sequence Learning: A Foot-stepping Serial Reaction Time Task
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Perceived difficulty of a motor task affects memory but not action.

Sabine Blaesi1, Bruce Bridgeman

  • 1Department of Psychology, University of California, Santa Cruz, CA, 95064, USA.

Attention, Perception & Psychophysics
|January 24, 2015
PubMed
Summary

Perceived task difficulty, not action success, alters size memory. Expecting a difficult motor task makes a target seem smaller, influencing future actions.

Area of Science:

  • Cognitive Psychology
  • Motor Control
  • Perception

Background:

  • Motor interaction success influences target size memory.
  • Previous research attributed this to action's effect on perception or memory.

Purpose of the Study:

  • To investigate whether action feedback or action-provided information is crucial for altered size memory.
  • To determine if perceived difficulty alone, before motor execution, affects remembered goal characteristics.

Main Methods:

  • Participants estimated the size of a hole after being told the task of throwing a marble into it was either easy or difficult.
  • Size estimations were compared to actual hole size.
  • A second experiment tested the effect when the hole remained visible during estimation.

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Main Results:

  • Participants perceiving the task as difficult judged the hole as significantly smaller than its actual size.
  • Participants perceiving the task as easy estimated the size veridically.
  • Subsequent throwing success was independent of size estimates, indicating memory, not action, was affected.
  • The effect vanished when the hole was visible during size estimation.

Conclusions:

  • Perceived task difficulty, independent of action feedback, alters memory of goal size.
  • Size memory influences subsequent actions, but action success does not retroactively change size perception.
  • Visual feedback during estimation is critical for the perceived difficulty effect on size memory.