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Subcortical encoding of speech cues in children with congenital blindness

Zahra Jafari1,2,3, Saeed Malayeri4

  • 1Rehabilitation Research Center (RRC), Iran University of Medical Sciences (IUMS), Tehran, Iran.

Restorative Neurology and Neuroscience
|September 3, 2016
PubMed

Insights

Congenital blindness enhances subcortical auditory processing and musical abilities in children. This neuroplasticity, evident in auditory brainstem responses, improves speech and music skills.

Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Developmental Neuroscience

Background:

  • Congenital visual deprivation drives neural plasticity, offering insights into the brain's adaptive capabilities.
  • Studying neuroplasticity in congenitally blind (CB) individuals reveals how other senses compensate for vision loss.

Purpose of the Study:

  • To investigate the impact of congenital blindness on subcortical auditory processing in children.
  • To compare electrophysiological and behavioral auditory performance between congenitally blind and normal-sighted children.

Main Methods:

  • Utilized auditory brainstem response (ABR) testing with click and speech stimuli in 22 congenitally blind and 25 normal-sighted children (ages 8-12).
  • Assessed speech recognition and musical abilities using standardized behavioral tests.

Main Results:

  • Congenitally blind children exhibited significant differences in speech ABR wave characteristics (latencies, amplitude) compared to controls.
  • CB children demonstrated superior musical abilities and enhanced performance on a nonsense syllable test in noise.
  • Correlations between music scores, speech processing, and ABR measures were observed in CB children.

Conclusions:

  • Congenital blindness induces measurable subcortical neuroplasticity affecting auditory temporal, musical, and speech processing.
  • Findings support models of plasticity and highlight the role of corticofugal modulation in auditory processing.
Abstract

Keywords:
Congenitally-blindauditory brainstem responsecorticofugal modulationspeech

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