Auditory Localization and Spatial Release From Masking in Children With Suspected Auditory Processing Disorder.

Area of Science:

• Audiology and Speech-Language Pathology
• Neuroscience
• Developmental Psychology

Background:

• Auditory Processing Disorder (APD) is characterized by listening difficulties despite normal hearing.
• Sound localization and spatial release from masking are crucial for effective auditory perception in noisy environments.
• The relationship between suspected APD (sAPD) and these auditory spatial abilities in children requires further investigation.

Purpose of the Study:

• To determine if children with suspected APD exhibit deficits in sound localization in noise.
• To assess if children with suspected APD experience reduced benefit from spatial release from masking.
• To compare the auditory spatial performance of children with sAPD to typically developing (TD) children.

Main Methods:

• Forty-seven children (7-17 years) participated: 21 TD children and 26 with sAPD.
• Sound localization ability was measured in quiet, broadband noise, and speech-babble using lateral scatter and front/back accuracy metrics.
• Spatial release from masking was assessed using a modified Hearing in Noise Test (HINT) with varying noise source locations.

Main Results:

• Both groups showed improved localization with increasing signal-to-noise ratio.
• Broadband noise disrupted front/back localization more than lateral scatter compared to speech babble.
• No significant group differences were found in localization metrics (Lscat, FBpc) or spatial release from masking (SRM).

Conclusions:

• Children with suspected APD did not differ significantly from TD children in sound localization or spatial release from masking.
• While some children with listening difficulties may struggle with localization, it does not appear to be a global APD characteristic.
• The heterogeneity of APD suggests future case study designs may offer deeper insights into specific deficits.