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ISSN : 1226-9654

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Vol.9 No.1

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Adaptive gaze control in schizophrenic patients: Accuracy and adaptation speed.

The Korean Journal of Cognitive and Biological Psychology / The Korean Journal of Cognitive and Biological Psychology, (P)1226-9654; (E)2733-466X
1997, v.9 no.1, pp.57-70
Choongkil Lee (Department of Psychology, Seoul National University)
Kyunghan Kim (Department of Psychology, Seoul National University)
Cheuleung Kim (Department of Psychiatry, School of Medicine, Inha University)
Lee, C., Kim, K., & Kim, C. (1997). Adaptive gaze control in schizophrenic patients: Accuracy and adaptation speed.. The Korean Journal of Cognitive and Biological Psychology, 9(1), 57-70.

Abstract

While most neurological models of schizophrenia have focused on cerebral functions, cerebellar atropy, especially in vermis has been repeatedly reported in schizophrenic patients from brain imaging and lesion studies. Cerebellar vermis has been implicated for adaptive control of saccadic eye movements, which has not been studied in schizophrenics to our knowlege. We investigated saccadic adaptation using double-step paradigm in 5 schizophrenic patients and 5 normal control. Gaze and head movements were recorded v/ith scleral search coil method in head-free condition. Time course of adaptation in schizoprenics was similar to that of control, but it never reached to the complete level of adaptation seen in control, and accordingly gaze gain (gaze amplitude/target amplitude) was low even after 600 adaptative trials. Head contribution to gaze saccade was relatively low and time to peak head velocity was longer in schizophrenics suggesting a different strategy of gaze control. Variability across patients iii adaptation parameters need to be further investigated in combination with cerebellar volumetry.

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The Korean Journal of Cognitive and Biological Psychology

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