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Cortical responses of infants with and without a genetic risk for dyslexia: II. Group effects

P H Leppänen1, E Pihko, K M Eklund

  • 1Department of Psychology, University of Jyväskylä, Finland.

Neuroreport
|May 13, 1999
PubMed

Insights

Newborns with a high familial risk for dyslexia show different brain responses to speech sound durations compared to control infants. This suggests early auditory processing differences in infants at risk for developmental dyslexia.

Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Speech and Hearing Science

Background:

  • Infants with a family history of developmental dyslexia have a higher risk of developing the condition.
  • Previous research found no significant differences in event-related potentials (ERPs) between at-risk and control infants until 6 months of age.

Purpose of the Study:

  • To investigate early auditory processing differences in newborns at high risk for dyslexia.
  • To determine if altered speech sound duration processing is present at birth in these infants.

Main Methods:

  • Event-related potentials (ERPs) were recorded in newborns.
  • A slower stimulus presentation rate was used, presenting a short deviant /ka/ and a long standard /kaa/ sound.
  • ERPs were compared between infants with a high familial risk for dyslexia and control infants.

Main Results:

  • Significant differences in ERPs were observed between the short /ka/ and long /kaa/ stimuli in newborns.
  • Clear group differences in ERPs were found between the at-risk and control infant groups.
  • These differences were evident at birth, unlike findings in previous studies at 6 months.

Conclusions:

  • Infants at high familial risk for dyslexia exhibit distinct processing of speech/auditory stimulus durations from birth.
  • Early differences in auditory processing may serve as a potential biomarker for dyslexia risk.
  • The findings highlight the importance of stimulus presentation rate in revealing subtle neurophysiological differences in early development.

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