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Auditory hallucinations inhibit exogenous activation of auditory association cortex
A S David1, P W Woodruff, R Howard
1Department of Psychological Medicine, King's College School of Medicine and Dentistry, London, UK.
Neuroreport
|March 22, 1996
Summary
Hallucinations in schizophrenia correlate with reduced temporal cortex response to external speech, regardless of medication. This suggests hallucinations involve maximal activation of sensory cortex specific to the experience.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Science
Background:
- Hallucinations, perceptions without external stimuli, offer insights into conscious perception.
- Functional magnetic resonance imaging (fMRI) detects brain activity via blood oxygenation changes.
Observation:
- fMRI studied a schizophrenia patient during auditory hallucinations and hallucination-free states.
- Cortical activation was assessed using auditory and visual stimuli, with and without antipsychotic medication.
Findings:
- Auditory hallucinations coincided with markedly reduced temporal cortex response to external speech.
- Visual cortical activation remained normal during visual stimulation, irrespective of medication status.
Implications:
- Hallucinations may involve maximal activation of modality-specific sensory and association cortex.
- Understanding neural correlates of hallucinations can inform treatment strategies for schizophrenia.