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Enhancement of Visual Motion Detection Thresholds in Early Deaf People
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Enhancement of Visual Motion Detection Thresholds in Early Deaf People
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Journal Article
Enhancement of Visual Motion Detection Thresholds in Early Deaf People
2014
Overview
In deaf people, the auditory cortex can reorganize to support visual motion processing. Although this cross-modal reorganization has long been thought to subserve enhanced visual abilities, previous research has been unsuccessful at identifying behavioural enhancements specific to motion processing. Recently, research with congenitally deaf cats has uncovered an enhancement for visual motion detection. Our goal was to test for a similar difference between deaf and hearing people. We tested 16 early and profoundly deaf participants and 20 hearing controls. Participants completed a visual motion detection task, in which they were asked to determine which of two sinusoidal gratings was moving. The speed of the moving grating varied according to an adaptive staircase procedure, allowing us to determine the lowest speed necessary for participants to detect motion. Consistent with previous research in deaf cats, the deaf group had lower motion detection thresholds than the hearing. This finding supports the proposal that cross-modal reorganization after sensory deprivation will occur for supramodal sensory features and preserve the output functions.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Animals
/ Auditory Threshold - physiology
/ Biology
/ Deafness
/ Female
/ Hearing
/ Humans
/ Male
/ Medicine
/ Motion Perception - physiology
/ Music
/ Persons With Hearing Impairments
/ Photic Stimulation - methods
/ Psychomotor Performance - physiology
/ Sensory Deprivation - physiology
/ Social and Behavioral Sciences
/ Sound
/ Studies
