title: Abnormalities in central auditory maturation in children with language-based learning problems.
abstract: OBJECTIVE
  To examine maturation of the central auditory pathways in children with language-based learning problems (LP).
  
  
  METHODS
  Cortical auditory evoked potentials (CAEPs) recorded from 26 children with LP were compared to CAEPs recorded from 38 typical children. CAEP responses were recorded in response to a speech sound, /uh/, which was presented in a stimulus train with decreasing inter-stimulus intervals (ISIs) of 2000, 1000, 560, and 360 ms.
  
  
  RESULTS
  We identified three atypical morphological categories of CAEP responses in the LP group. Category 1 responses revealed delayed P1 latencies and absent N1/P2 components. Category 2 responses revealed typical P1 responses, but delayed N1 and P2 responses. Category 3 responses revealed generally low-amplitude CAEP responses. A fourth sub-group of LP children had normal CAEP responses.
  
  
  CONCLUSIONS
  Overall, the majority of children with LP had abnormal CAEP responses. These children fell into distinct categories based on the abnormalities in maturational patterns of their CAEP responses.
  
  
  CONCLUSIONS
  We describe a rate sensitive stimulation paradigm which may be used to identify and categorize LP children who exhibit abnormal patterns of central auditory maturation.
authors.affiliation: The University of Texas at Dallas, School of Behavioral and Brain Sciences, Callier Advanced Hearing Research Center, 1966 Inwood Rd., Dallas, TX 75206, USA. pgilley@utdallas.edu
authors.forename: Phillip M
authors.initials: PM
authors.lastname: Gilley
authors.forename: Anu
authors.initials: A
authors.lastname: Sharma
authors.forename: Michael
authors.initials: M
authors.lastname: Dorman
authors.forename: Kathryn
authors.initials: K
authors.lastname: Martin
mesh_terms: D000161:Acoustic Stimulation / Q000379:methods; D000293:Adolescent; D000367:Age Factors; D001303:Auditory Cortex / Q000502:physiology*; D002648:Child; D002657:Child Development / Q000502:physiology*; D004569:Electroencephalography / Q000379:methods; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D005260:Female; D006801:Humans; D007806:Language Disorders / Q000503:physiopathology*; D007859:Learning Disabilities / Q000503:physiopathology*; D008297:Male; D013997:Time Factors