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Spatiotemporal integration for tactile localization during arm movements: a probabilistic approach.

Femke Maij1, Alan M Wing, W Pieter Medendorp

  • 1Radboud University Nijmegen, Donders Institute for Brain, Cognition and Behaviour, Nijmegen, The Netherlands; and.

Journal of Neurophysiology
|August 23, 2013
PubMed
Summary

People make greater tactile localization errors during faster arm movements. This study models these spatial errors, linking them to temporal uncertainty in processing tactile stimuli during arm motion.

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Area of Science:

  • Neuroscience
  • Psychology
  • Biomechanics

Background:

  • Systematic spatial errors occur in tactile localization during arm movements.
  • These errors are hypothesized to arise from temporal uncertainty in stimulus processing.

Purpose of the Study:

  • To model and test the relationship between arm movement velocity and tactile localization errors.
  • To investigate the role of temporal uncertainty in dynamic tactile perception.

Main Methods:

  • A probabilistic model was developed to predict spatial errors based on temporal uncertainty and arm velocity.
  • Participants (n=8) performed slow and fast arm movements while localizing a tactile stimulus on their index finger.

Main Results:

  • Localization errors were significantly larger during faster arm movements, confirming the model's prediction.
Keywords:
hapticshumanmislocalizationmovementperception

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  • The model accurately predicted the observed errors for both slow and fast movements, with temporal uncertainty as the sole free parameter.

    • Conclusions:

    • Spatial errors in dynamic tactile perception are primarily caused by temporal uncertainty in processing tactile inputs.
    • The precision of temporal stimulus processing directly influences spatial accuracy during movement.