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Humans Can Track But Fail to Predict Accelerating Objects.

Philipp Kreyenmeier1,2, Luca Kämmer2, Jolande Fooken2,3

  • 1Graduate Program in Neuroscience, University of British Columbia, British Columbia, Canada, V6T 1Z3 philipp.kreyenmeier@alumni.ubc.ca.

Eneuro
|January 13, 2023
PubMed
Summary
This summary is machine-generated.

Humans track accelerating objects visually but fail to use acceleration for predicting time-to-contact (TTC). Interception timing relies on final velocity, not acceleration, for both eye and hand movements.

Keywords:
accelerationeye-hand coordinationmanual interceptionpredictionsaccadessmooth pursuit

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Area of Science:

  • * Visual perception and oculomotor control
  • * Human motor control and predictive action

Background:

  • * Real-world objects exhibit unpredictable motion, including acceleration.
  • * Accurate prediction of time-to-contact (TTC) is crucial for interceptive actions.

Purpose of the Study:

  • * Investigate human integration of target acceleration in predicting TTC.
  • * Examine how acceleration influences predictive eye (saccade) and hand movements.

Main Methods:

  • * Observers tracked an accelerating visual target and performed interceptive hand movements after occlusion.
  • * Compared three models for TTC prediction: final velocity, average velocity, and velocity plus acceleration.
  • * Analyzed timing of predictive saccades and manual interceptions.

Main Results:

  • * Smooth pursuit eye tracking accurately followed target acceleration.
  • * Predictive saccade and manual interception timing did not account for target acceleration.
  • * Interception timing best fit a model using only the final target velocity before occlusion.

Conclusions:

  • * Human observers fail to integrate target acceleration into TTC predictions for interceptive actions.
  • * Predictive eye and hand movements rely on extrapolating final velocity, ignoring acceleration.
  • * This insensitivity to acceleration impacts both predictive saccades and manual interceptions.