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Brainstem timing: implications for cortical processing and literacy.

Karen Banai1, Trent Nicol, Steven G Zecker

  • 1Auditory Neuroscience Laboratory, Northwestern University, Evanston, Illinois 60208, USA. k-banai@northwestern.edu

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|October 28, 2005
PubMed
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Abnormal brainstem timing in children with learning disabilities is linked to reduced auditory processing and poorer literacy skills. This neural timing issue may serve as a biological marker for a learning disability subgroup.

Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Speech and Hearing Science

Background:

  • Language-based learning disabilities (LLDs) lack a definitive biological marker.
  • Auditory processing deficits are common in LLDs at perceptual and physiological levels.

Purpose of the Study:

  • To investigate the relationship between brainstem timing, cortical auditory processing, and literacy skills in children.
  • To identify potential biological markers for LLDs.

Main Methods:

  • Measured brainstem timing and mismatch negativity (MMN) in children with LLDs and typically developing children.
  • Subdivided the LLD group based on normal versus abnormal brainstem timing.
  • Compared MMN, literacy, and cognitive abilities across the three groups.

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Main Results:

  • Children with LLDs and abnormal brainstem timing showed reduced cortical processing of acoustic change (lower MMN).
  • This subgroup also exhibited more severe LLDs, including poorer reading, listening comprehension, and cognitive abilities.
  • Abnormal brainstem timing correlated with reduced cortical sensitivity and deficient literacy skills.

Conclusions:

  • Abnormal brainstem timing is associated with impaired cortical auditory processing and literacy deficits in a subgroup of children with LLDs.
  • Faulty neural timing mechanisms at the brainstem may underlie LLDs in this group.
  • Abnormal brainstem timing could serve as a reliable biological marker for identifying this LLD subgroup.