Central auditory processing deficits in schizophrenia: Effects of auditory-based cognitive training

Area of Science:

• Neuroscience
• Psychiatry
• Audiology

Background:

• Schizophrenia (SZ) is associated with sensory processing abnormalities, particularly in speech perception within noisy environments.
• Targeted cognitive training (TCT) is a cognitive remediation strategy aimed at improving low-level auditory information processing.
• The impact of TCT on central auditory processing (CAP) and its relation to verbal learning in SZ remains unclear.

Purpose of the Study:

• To investigate the effects of TCT on behavioral measures of CAP in individuals with schizophrenia.
• To determine if CAP function influences verbal learning outcomes following TCT in schizophrenia patients.
• To assess the efficacy of TCT as an intervention for auditory processing deficits in schizophrenia.

Main Methods:

• Schizophrenia (n=42) and healthy control (n=18) subjects underwent auditory and neurocognitive assessments.
• Schizophrenia patients were randomized to receive either treatment-as-usual (TAU) or 30 hours of TCT plus TAU.
• Assessments were repeated after approximately 10-12 weeks to evaluate changes in auditory processing and verbal learning.

Main Results:

• Schizophrenia patients demonstrated deficits in speech recognition tests (Words-in-Noise and Quick Speech-in-Noise).
• The TCT group showed significant improvements in Words-in-Noise performance compared to the TAU group.
• Schizophrenia patients with greater baseline CAP deficits exhibited substantial gains in verbal learning after TCT.

Conclusions:

• Intensive auditory training (TCT) enhances auditory processing fidelity in schizophrenia patients.
• Improvements in CAP were observed, with specific deficits being 'normalized' post-TCT.
• CAP function is predictive of verbal learning gains, suggesting TCT may be most beneficial for individuals with significant CAP impairments.