Speech processing disorder in neural hearing loss

Area of Science:

• Neuroscience
• Audiology
• Neurology

Background:

• Central auditory processing deficits are linked to conditions like traumatic brain injury, neurodegenerative diseases, and aging.
• Subtle deficits are also observed in neurodevelopmental disorders, including learning disabilities and attention deficit disorder (ADD).

Purpose of the Study:

• To review illustrative cases demonstrating audiological test batteries for central auditory processing deficits.
• To define the locus of auditory dysfunction using electrophysiological tests.

Main Methods:

• Utilized a comprehensive audiological test battery.
• Employed electrophysiological tests of auditory function.
• Examined patients with auditory neuropathy/dyssynchrony syndrome, inferior colliculi lesions, and temporal lobe lesions.

Main Results:

• Demonstrated the utility of audiological test batteries in diagnosing central auditory processing deficits.
• Identified dysfunction at various neural levels, including the auditory nerve, midbrain, and cortex.

Conclusions:

• Central auditory processing deficits manifest across diverse clinical populations.
• Electrophysiological assessments are crucial for localizing auditory pathway dysfunction.