Basic auditory processing is related to familial risk, not to reading fluency: an ERP study.

Area of Science:

• Neuroscience
• Auditory Neuroscience
• Developmental Neuroscience

Background:

• Basic auditory processing deficits are linked to dyslexia.
• The relationship between familial risk for reading problems and auditory processing proficiency remains unclear.

Purpose of the Study:

• To investigate auditory processing of amplitude rise time (ART), intensity, and frequency differences in children with and without familial risk for dyslexia.
• To determine if auditory processing differences are correlates of familial risk or directly cause dyslexia.

Main Methods:

• Utilized event-related potentials (ERPs) to measure auditory change detection.
• Analyzed mismatch negativity (MMN) and late discriminative negativity (LDN) components.
• Compared ERPs across fluent readers at risk for dyslexia, poor readers at risk for dyslexia, and fluent reading controls.

Main Results:

• All groups exhibited MMN for ART and frequency changes, but not intensity.
• LDN was observed for ART and frequency changes in all groups, with differential scalp activation for frequency in familial risk children.
• Only controls showed an LDN for intensity changes, suggesting diminished sensitivity in familial risk groups.

Conclusions:

• Auditory processing of ART and frequency are not directly related to reading fluency.
• Diminished intensity sensitivity and altered frequency processing lateralization are correlates of familial risk for dyslexia.
• These auditory differences do not appear to directly cause dyslexia but are associated with familial risk.