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Related Experiment Videos

A motor signal and "visual" size perception

D P Carey1, K Allan

  • 1School of Psychology, University of St. Andrews, Fife, Scotland, UK. d.carey@abdn.ac.uk

Experimental Brain Research
|August 1, 1996
PubMed
Summary
This summary is machine-generated.

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Motor signals related to arm position influence visual size perception. This study found that proprioceptive feedback alone can create an afterimage size illusion, suggesting spatial registration is key.

Area of Science:

  • Neuroscience
  • Visual Perception
  • Motor Control

Background:

  • Primate visual system models propose separate streams for perception and visuomotor control.
  • A perceptual illusion reveals motor signals influencing visual size perception.
  • This illusion involves illusory size changes in hand afterimages during arm movement.

Purpose of the Study:

  • To investigate the source of motor signals (feedforward vs. feedback) driving the afterimage size illusion.
  • To determine if active (self-generated) or passive (experimenter-controlled) arm movements elicit the illusion.
  • To understand the role of proprioception and kinesthesis in visual size perception.

Main Methods:

  • Subjects experienced an afterimage of their hand.
  • Illusion magnitude was measured during active arm movements (self-controlled).

Related Experiment Videos

  • Illusion magnitude was measured during passive arm movements (experimenter-controlled).
  • The illusion was tested when the afterimage was created before movement of a different limb.

    • Main Results:

    • Active and passive arm movements produced equivalent illusory size changes in hand afterimages.
    • The illusion was absent when the afterimage was generated prior to movement of a different limb.
    • Proprioceptive/kinesthetic feedback was sufficient to drive the illusion.

    Conclusions:

    • Proprioceptive/kinesthetic feedback, not feedforward signals, is sufficient to cause the afterimage size illusion.
    • The illusion requires specific three-dimensional spatial registration between proprioceptive input and the initial afterimage.
    • Motor signals contribute to visual perception, challenging strict functional stream separation.