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Action ability modulates time-to-collision judgments.

Eleonora Vagnoni1,2, Vasiliki Andreanidou3, Stella F Lourenco4

  • 1Department of Psychological Sciences, Birkbeck, University of London, London, UK. e.vagnoni@ucl.ac.uk.

Experimental Brain Research
|June 14, 2017
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Summary
This summary is machine-generated.

Momentary action capability influences time-to-collision (TTC) underestimation, with reduced movement increasing this bias. This effect, however, did not extend to spatial perception tasks like line bisection.

Keywords:
Action abilityEmotionLoomingMotor abilityPeripersonal space representationTime-to-collision

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Factors

Background:

  • Time-to-collision (TTC) underestimation is linked to action preparation and defensive behaviors.
  • Physical fitness influences TTC underestimation; less fit individuals show stronger effects.
  • The role of momentary action capability in TTC bias requires further investigation.

Purpose of the Study:

  • To investigate if momentary action capability influences TTC underestimation.
  • To explore the relationship between action capability, TTC bias, and peripersonal space (PPS).

Main Methods:

  • Experiment 1: Participants estimated TTC of stimuli under conditions of reduced movement (chin rest) versus free standing.
  • Experiment 2: Assessed peripersonal space (PPS) using a line bisection task under the same movement conditions.

Main Results:

  • Reduced movement capability increased TTC underestimation, but not differentially for threatening stimuli.
  • The line bisection task showed a standard spatial attention gradient but no effect of immobilization.
  • Momentary action capability affected TTC estimation but not spatial perception (line bisection).

Conclusions:

  • Momentary action capability influences TTC underestimation, potentially through mechanisms distinct from those governing peripersonal space.
  • The findings suggest that TTC underestimation and PPS may rely on partially separate functional systems.