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Speechreading circuits in people born deaf.

Mairéad MacSweeney1, Gemma A Calvert, Ruth Campbell

  • 1BBSU, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, UK. m.macsweeney@ich.ucl.ac.uk

Neuropsychologia
|March 20, 2002
PubMed
Summary

Silent speechreading activates different brain areas in deaf individuals compared to hearing individuals. Acoustic experience influences how the brain processes visual speech cues.

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Neuroimaging

Background:

  • Silent speechreading in hearing individuals activates superior temporal regions, crucial for auditory speech perception.
  • Understanding how the deaf brain processes visual speech is essential for understanding sensory substitution and neural plasticity.

Purpose of the Study:

  • To investigate brain activation patterns during silent speechreading in deaf versus hearing individuals.
  • To determine if acoustic experience shapes the neural circuits involved in speech perception.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to collect brain data.
  • Participants included deaf and hearing volunteers.
  • Tasks involved silent speechreading of numbers and a control task of counting mouth movements (gurns).

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Main Results:

  • Deaf participants showed speechreading-specific activation in the posterior cingulate cortex and hippocampal/lingual gyri.
  • Hearing participants exhibited activation in superior temporal regions, as expected.
  • Deaf participants lacked speechreading-specific activation in left lateral temporal regions, unlike hearing individuals.

Conclusions:

  • Acoustic experience significantly shapes the functional neural circuits for analyzing speech.
  • The posterior cingulate gyrus may play a crucial role in speechreading for the profoundly congenitally deaf.
  • These findings highlight the brain's adaptability in response to sensory experience.