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Echo01:06

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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
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The size-weight illusion induced through human echolocation.

Gavin Buckingham1, Jennifer L Milne2, Caitlin M Byrne2

  • 1Department of Psychology, School of Life Sciences, Heriot-Watt University The Brain and Mind Institute, Department of Psychology, University of Western Ontario g.buckingham@hw.ac.uk.

Psychological Science
|December 21, 2014
PubMed
Summary
This summary is machine-generated.

Blind individuals using echolocation can perceive object size through sound echoes. This study shows echolocation-induced size perception influences weight perception, demonstrating cross-sensory effects.

Keywords:
perceptionperceptual motor coordination

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Area of Science:

  • Neuroscience
  • Sensory Perception
  • Human-Computer Interaction

Background:

  • Some blind individuals use echolocation (interpreting self-generated sound echoes) to perceive their environment.
  • The extent to which echolocation influences other sensory modalities is not fully understood.

Purpose of the Study:

  • To investigate if echolocation-induced size representations can affect weight perception.
  • To explore the cross-modal influence of sensory substitution on intact senses.

Main Methods:

  • Expert echolocators produced sounds (tongue clicks, finger snaps) directed at objects.
  • Participants then lifted objects of varying sizes and weights.
  • The size-weight illusion was measured.

Main Results:

  • Echolocators exhibited a significant size-weight illusion.
  • Perceived object size, derived from echolocation, influenced their judgment of object weight.

Conclusions:

  • Sensory substitution via echolocation can impact perception in other senses.
  • This study provides the first evidence of echolocation influencing conscious perception through an intact sense (vision/touch).
  • Findings highlight the brain's plasticity and integration of sensory information.