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Duplicated Heschl's gyrus associations with phonological decoding.

Mark A Eckert1

  • 1Department of Otolaryngology - Head and Neck Surgery, Medical University of South Carolina, Charleston, SC, 29425, USA. eckert@musc.edu.

Brain Structure & Function
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Summary
This summary is machine-generated.

Individuals with a duplicated left Heschl

Keywords:
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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Genetics

Background:

  • A complete duplication of the left hemisphere Heschl's gyrus (HG) is observed in individuals with reading disabilities.
  • The underlying reasons for this association and its specificity remain unclear.

Purpose of the Study:

  • To replicate and investigate the association between Heschl's gyrus (HG) morphology and phonological decoding.
  • To test hypotheses regarding the localization of this association within the HG or its relation to other brain regions involved in reading and language.

Main Methods:

  • A multi-site study compared individuals with duplicated left HG (N=96) and single HG (N=96), matched for age, sex, and site.
  • HG morphology templates were used to assess HG size and its relation to phonological decoding within each group.

Main Results:

  • The duplicated HG group exhibited significantly lower phonological decoding compared to the single HG group.
  • Larger HG size, particularly the lateral HG, was associated with lower phonological decoding in the duplicated HG group.
  • Structural covariance with other brain regions did not explain the HG-phonological decoding association.

Conclusions:

  • The presence of a duplicated HG may indicate a risk for lower phonological decoding ability, independent of verbal IQ.
  • The precise mechanisms driving this association require further investigation.