Patients with schizophrenia demonstrate reduced cortical sensitivity to auditory oddball regularities

Area of Science:

• Neuroscience
• Cognitive Psychology
• Psychiatry

Background:

• Schizophrenia is associated with impaired context processing.
• Auditory event-related potential (ERP) responses are affected by preceding non-target tones.
• Previous research links ERP deficits to the number of preceding non-targets.

Purpose of the Study:

• To investigate if schizophrenia patients show reduced sensitivity to subtle auditory context.
• To quantify auditory context using Itti and Baldi's Bayesian prediction error model.
• To compare sensitivity to context and non-target count between schizophrenia patients and controls.

Main Methods:

• Measured cortical responses (ERPs) to auditory oddball tones in 59 schizophrenia patients (SZ) and 59 controls (HC).
• Estimated individual trial amplitudes using group independent component analysis (ICA).
• Quantified auditory context with a Bayesian prediction error model and analyzed ERP sensitivity.

Main Results:

• Schizophrenia patients showed reduced ERP amplitudes to targets (244-412 ms post-onset).
• Control group ERP amplitudes were more sensitive to modeled prediction error than schizophrenia patients.
• ERP sensitivity to the number of preceding non-targets showed a trend towards significance.

Conclusions:

• Schizophrenia patients exhibit diminished perceptual sensitivity to auditory context.
• Findings highlight differences in attentional and perceptual processing of environmental regularities.