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Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
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Flexibly weighted integration of tactile reference frames.

Stephanie Badde1, Brigitte Röder1, Tobias Heed1

  • 1Biological Psychology and Neuropsychology, University of Hamburg, Von-Melle-Park 11, 20146 Hamburg, Germany.

Neuropsychologia
|December 3, 2014
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Summary
This summary is machine-generated.

The brain flexibly adjusts how it uses anatomical and external spatial information for tactile location based on the task. This suggests top-down modulation influences reference frame weighting for better performance.

Keywords:
Coordinate integrationRemappingTouch

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Sensory Perception

Background:

  • The brain integrates skin-based anatomical and external spatiotopic coordinates for tactile localization.
  • It is unclear if the weighting of these coordinate systems is fixed or context-dependent.

Purpose of the Study:

  • To investigate whether the brain's use of anatomical versus external spatial reference frames for tactile stimuli is fixed or task-dependent.
  • To determine if task context influences the weighting of different spatial coordinate systems.

Main Methods:

  • Participants performed temporal order judgments (TOJ) on tactile stimuli presented to crossed or uncrossed hands.
  • Secondary tasks involved judgments on stimulus vibration, emphasizing either anatomical or external spatial coding, or temporal order.

Main Results:

  • A TOJ crossing effect (impaired performance with crossed hands) was observed across conditions.
  • A spatial secondary task emphasizing anatomical coding improved crossed-hand performance in the primary TOJ task.
  • A temporal secondary task also improved crossed-hand performance.

Conclusions:

  • The integration weights for anatomical and external reference frames are not fixed.
  • These weights are flexibly adjusted based on task context, likely via top-down modulation.
  • This highlights the dynamic nature of spatial reference frame selection in tactile perception.