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Alterations in cerebral laterality during acute psychotic illness
Summary
Perceptual asymmetry (PA) in patients recovering from psychosis unexpectedly decreased on a word test, while other tests showed no change. These findings challenge generalized hemisphere dysfunction theories in psychiatric illness.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Psychology
Background:
- Perceptual asymmetry (PA) is studied in psychiatric disorders.
- Previous research suggested generalized hemisphere dysfunction in major psychiatric illness.
Purpose of the Study:
- To monitor changes in PA during recovery from acute psychotic episodes.
- To investigate the specificity of PA changes across different sensory modalities.
Main Methods:
- A novel dichotic listening test using fused rhymed words was employed.
- Additional tests included dichotic nonsense syllables, dichotic tones, and visual field dot localization.
- PA was assessed in patients during recovery from acute psychotic episodes.
Main Results:
- Contrary to expectations, PA on the fused rhymed words test significantly decreased with recovery.
- Asymmetry on the dichotic nonsense syllables, dichotic tone, and dot localization tests remained unchanged.
- Observed changes were independent of diagnosis, medication, and overall performance improvements.
Conclusions:
- Generalized single hemisphere dysfunction models are inadequate to explain PA changes in major psychiatric illness.
- More specific hypotheses are required to understand the neurocognitive underpinnings of recovery from psychosis.
- Sensory modality-specific alterations in PA may occur during recovery from psychotic episodes.