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Aiming error under transformed spatial mappings suggests a structure for visual-motor maps.

H A Cunningham1

  • 1Department of Psychology, Stanford University, California 94305.

Journal of Experimental Psychology. Human Perception and Performance
|August 1, 1989
PubMed
Summary

Researchers explored internal spatial representations in motor control using transformed visual-motor mappings. Findings suggest a two-component spatial model, invariant to learning, explaining movement errors under rotation.

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Area of Science:

  • Cognitive Psychology
  • Motor Control
  • Human Movement Science

Background:

  • Understanding internal spatial representations is crucial for motor control.
  • Visual-motor processes are fundamental to goal-directed movements.

Purpose of the Study:

  • To investigate the structure of internal spatial representations in the motor control system.
  • To perturb normal visual-motor processes using transformed spatial mappings.

Main Methods:

  • A 2-D discrete aiming task was employed.
  • Participants performed the task under rotated visual-motor mappings.
  • Spatial movement error patterns were analyzed across different rotation angles.

Main Results:

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  • Consistent spatial movement error patterns emerged across participants, with peak error at 90-135 degrees rotation and minimal error at 180 degrees.
  • Movement direction reversals were observed for rotations exceeding 90 degrees, supporting a hypothesized two-component spatial representation.
  • Adaptation to rotation occurred uniformly across target locations but did not change the relative difficulty of different rotations.

    • Conclusions:

    • A two-component spatial representation, comprising oriented bidirectional movement axes and direction of travel, is proposed.
    • The structure of these internal spatial representations appears invariant under learning.
    • Movement error patterns under reflections differ from rotations, highlighting distinct processing mechanisms.