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Pattern recognition using a device substituting audition for vision in blindfolded sighted subjects.

C Poirier1, A De Volder, D Tranduy

  • 1Neural Rehabilitation Engineering Laboratory, Université Catholique de Louvain, Brussels, Belgium.

Neuropsychologia
|November 23, 2006
PubMed
Summary

Sensory substitution devices may create visual-like perceptions. This study found increased visual brain area activity after training, suggesting visual imagery plays a role in pattern recognition using sound-based visual substitution.

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Area of Science:

  • Neuroscience
  • Sensory Perception
  • Cognitive Science

Background:

  • Sensory substitution (SS) explores how the brain adapts to receiving information through non-native senses.
  • Understanding the perceptual experience generated by SS devices is a key research question.

Purpose of the Study:

  • To investigate the neural mechanisms underlying pattern recognition using an auditory-visual sensory substitution device.
  • To examine how brain activity changes with training in blindfolded sighted individuals.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to monitor brain activity.
  • Participants performed pattern recognition tasks using an auditory-visual SS device.
  • Brain activity was assessed before and after a short training period.

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Main Results:

  • Initially, pattern recognition engaged dorsal and ventral extra-striate visual areas.
  • Following training, there was a significant increase in the recruitment of these visual areas.
  • This suggests enhanced processing within the visual cortex.

Conclusions:

  • Perception through auditory-visual SS devices might be inherently visual-like.
  • Visual imagery processes are likely involved in pattern recognition via SS.
  • The brain demonstrates plasticity in adapting visual areas for non-visual sensory input.