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The effect of distraction on acute schizophrenics' visual tracking
Biological Psychiatry
|October 1, 1978
Summary
Schizophrenia patients exhibit more smooth pursuit eye movement (SPEM) impairments, specifically velocity arrests, compared to controls. While auditory-visual distraction had minimal impact, dichotic listening worsened SPEM in both groups, particularly in schizophrenic patients.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Psychology
Background:
- Smooth pursuit eye movement (SPEM) is often impaired in schizophrenia.
- The specific nature of this impairment and its susceptibility to distraction remain areas of investigation.
Purpose of the Study:
- To investigate the characteristics of impaired SPEM in acute-phase schizophrenia.
- To determine the differential effects of auditory-visual and dichotic listening distractions on SPEM in schizophrenia.
Main Methods:
- Studied 16 hospitalized schizophrenic patients and 16 nonpsychotic controls.
- Assessed SPEM during five 30-second phases: baseline, auditory-visual distraction, middle baseline, dichotic listening, and final baseline.
- Quantified SPEM using velocity arrests as a primary measure.
Main Results:
- Schizophrenic patients showed significantly more velocity arrests across all experimental phases.
- Auditory-visual distraction did not significantly impair SPEM in either group compared to baseline.
- Dichotic listening significantly increased velocity arrests in both groups, with a trend toward greater impairment in schizophrenics.
Conclusions:
- SPEM impairment in schizophrenia is characterized by increased velocity arrests.
- Inattentiveness alone does not fully explain SPEM deficits in schizophrenia.
- More demanding cognitive tasks, like dichotic listening, reveal greater SPEM impairments in schizophrenic individuals.