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A Structured Rehabilitation Protocol for Improved Multifunctional Prosthetic Control: A Case Study
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Published on: November 6, 2015

Action planning with two-handed tools.

Arvid Herwig1, Cristina Massen

  • 1Department of Psychology, Max-Planck-Institute for Human Cognitive and Brain Sciences, Stephanstrasse 1a, 04103, Leipzig, Germany. herwig@cbs.mpg.de

Psychological Research
|November 7, 2008
PubMed
Summary
This summary is machine-generated.

When using two-handed tools, people rely on effector-specific mappings rather than tool behavior. This research reveals how the brain adapts to tool use and hand switching for efficient motor control.

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Area of Science:

  • Cognitive Neuroscience
  • Human Motor Control
  • Human-Computer Interaction

Background:

  • Tool use requires transforming intended goals into bodily movements via tool-specific target-to-movement mappings.
  • Bimanual tool use introduces complexity, as mappings can vary with the operated tool part and the effector (hand) used.
  • Understanding how humans represent these mappings during bimanual tool use is crucial for designing intuitive interfaces.

Purpose of the Study:

  • To investigate whether individuals represent the tool's behavior or only the effector-specific mapping during two-handed tool use.
  • To differentiate between representations of tool dynamics versus hand-specific movement transformations.

Main Methods:

  • Three experiments were conducted where participants used a two-jointed lever to touch target locations.
  • Participants used either their left or right hand, with conditions manipulating whether the lever's joint or the target-to-movement mapping remained constant during hand switching.
  • Performance costs associated with switching hands were measured under different experimental conditions.

Main Results:

  • Pronounced costs of switching hands were observed when the lever's joint was constant, implying a change in the target-to-movement mapping.
  • Smaller costs were found when the target-to-movement mapping remained constant, even if the joint switched.
  • This suggests that hand-switching costs are influenced by the stability of the effector-specific mapping.

Conclusions:

  • Participants appear to form tool-independent representations of effector-specific mappings during bimanual tool use.
  • The findings indicate a reliance on hand-specific motor programs rather than a holistic representation of the tool's behavior.
  • This has implications for understanding motor adaptation and designing user interfaces for complex tools.