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The relationship between smooth pursuit performance, motion perception and sustained visual attention in patients
T A Stuve1, L Friedman, J A Jesberger
1Department of Psychology, Case Western Reserve University, Cleveland, OH, USA.
Background:
In this study, we tested the hypothesis that low smooth pursuit gain in schizophrenia is related to an abnormality in motion perception.
Methods:
The subjects were 19 schizophrenics treated with clozapine and 19 controls. In addition to smooth pursuit and motion perception paradigms, sustained attention was also assessed using a continuous performance task (CPT).
Results:
In the patient group, there was a statistically significant negative correlation between smooth pursuit gain and motion perception threshold (r = -0.60, P < 0.01). This relationship was not secondary to attention deficits as assessed by the CPT.
Conclusions:
Our results are consistent with the notion that the smooth pursuit gain deficit is related to a deficit in motion perception rather than in attention. Brain area V5 (also referred to as "MT' in macaque), located in the parieto-occipital region, is known to be critically important both for motion perception and gain. Thus, our results point to an abnormality in this area in schizophrenia.
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