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Visual masking as a probe for abnormal gamma range activity in schizophrenia
Michael Foster Green1, Jim Mintz, Dustin Salveson
1Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, Los Angeles, California 90024-1759, USA.
Biological Psychiatry
|June 20, 2003
Summary
Schizophrenia patients show abnormal gamma range oscillations during visual masking tasks, unlike healthy individuals. This suggests visual perception deficits in schizophrenia may stem from aberrant gamma activity.
Area of Science:
- Neuroscience
- Psychiatry
- Visual Perception
Background:
- Visual masking tasks assess early visual perception stages.
- Schizophrenia patients exhibit consistent deficits in visual masking.
- These deficits may indicate vulnerability to schizophrenia.
Purpose of the Study:
- To investigate if visual masking can reveal abnormalities in gamma range oscillations in schizophrenia.
- To explore the relationship between visual masking performance and gamma activity in schizophrenia.
Main Methods:
- Nonlinear modeling of visual masking performance data from 89 schizophrenia patients and 20 controls.
- Electrophysiological recordings of event-related gamma activity during a visual masking task in a subset of patients and controls.
Main Results:
- Nonlinear modeling showed gamma oscillations (30-35 Hz) in controls, but not in schizophrenia patients.
- Controls, unlike patients, exhibited a significant burst of gamma activity (200-400 ms) post-target presentation (p <.05).
Conclusions:
- Visual masking can identify aberrant gamma range activity in schizophrenia.
- Perceptual difficulties in schizophrenia may be linked to impaired gamma oscillation generation or maintenance.