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The Structural Correlates of Statistical Information Processing during Speech Perception.

Isabelle Deschamps1,2, Uri Hasson3, Pascale Tremblay1,2

  • 1Département de Réadaptation, Université Laval, Québec City, QC, Canada.

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|February 27, 2016
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Summary
This summary is machine-generated.

Sensitivity to statistical structure in speech sounds is linked to brain anatomy. Thicker cortical thickness in specific brain regions correlates positively with better detection of patterns in auditory speech sequences.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Auditory Processing

Background:

  • Auditory perception, especially of complex signals like speech, depends on processing statistical regularities.
  • Transitional probabilities are key statistical cues used in understanding auditory sequences.

Purpose of the Study:

  • To investigate the relationship between sensitivity to regularity in auditory sequences and cortical thickness.
  • To identify specific brain regions involved in processing statistical structures in speech.

Main Methods:

  • Participants completed a regularity-rating task with auditory sequences of Italian syllables and bird songs.
  • Surface-based cortical thickness (CT) was measured and correlated with behavioral performance.
  • Statistical analyses identified correlations between CT variations and sensitivity to regularity.

Main Results:

  • Participants showed better regularity discrimination for syllable sequences than bird songs.
  • Inter-individual differences in speech regularity sensitivity correlated positively with cortical thickness in several brain regions.
  • These regions include the superior temporal sulcus, precentral sulcus, inferior frontal gyrus, insula, superior frontal gyrus/sulcus, and supramarginal gyrus.

Conclusions:

  • Cortical thickness in a distributed network of brain regions predicts the ability to detect statistical structure in auditory speech.
  • This network is involved in statistical structure processing, attention, and memory.
  • Positive correlations suggest that greater cortical thickness is associated with enhanced sensitivity to auditory statistical patterns.