Perception of Small Frequency Differences in Children with Auditory Processing Disorder or Specific Language...

Area of Science:

• Auditory Perception
• Developmental Psychology
• Speech and Language Pathology

Background:

• Frequency discrimination is often impaired in children with atypical language development, but findings on detecting small frequency changes are conflicting.
• Previous studies often excluded children with auditory deficits, leaving a gap in understanding suprathreshold frequency discrimination in those with both auditory processing and language skills.

Purpose of the Study:

• To examine frequency difference perception in children with auditory processing disorder (APD) and/or specific language impairment (SLI).
• To identify differences in behavioral responses to frequency changes between children with APD and SLI.
• To explore the auditory perceptual overlap between pediatric APD and SLI.

Main Methods:

• An experimental group design using a two-alternative forced-choice procedure.
• Frequency discrimination ability assessed for three magnitudes of frequency change (2%, 5%, 15%) from a 1000-Hz base frequency.
• Sensitivity index d' calculated, with correlations to auditory processing and language skills.

Main Results:

• Typically developing children and those with APD/SLI differed in detecting small frequency changes.
• APD and SLI status uniquely affected behavioral outcomes.
• Auditory processing scores correlated more strongly with small frequency changes, while language scores correlated more with large changes.

Conclusions:

• Children with APD/SLI exhibit frequency discrimination difficulties.
• Impairment may occur at a basic auditory level (APD) or higher language processing level (SLI).
• Labeling demands in discrimination tasks may affect SLI performance.