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Slow Cortical Potentials Preceeding Visually Guided Saccades in Schizophrenics

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Abstract

The parameters of saccades and presaccadic slow potentials were studied in right-handed men with a dominant right eye, including 19 schizophrenics and 12 healthy subjects. For visual stimulation, three light-emitting diodes were used, which were located in the center of the visual field (the central fixation stimulus) and 10° to the right and left of it (peripheral stimuli). Two stimulation protocols were used: with a simultaneous switching off of the central fixation stimulus and switching on of the peripheral stimuli (test 1) and with an interstimulus gap of 200 ms (test 2). According to the latency, saccades were divided into anticipatory, express, and regular. Slow EEG potentials preceding regular saccades were analyzed. It was found that the proportion of anticipatory saccades is considerably higher than the normal value in schizophrenia. The analysis of the presaccadic potentials demonstrated a significant decrease in the amplitude of negative potentials in the vertex region at early stages of presaccadic preparation and its increase in the occipital region at late stages. Test 2 in the patients demonstrated an increase in the positivity focus in the frontal region of the right hemisphere. It was assumed that the alterations found in schizophrenia result from the deficit of frontal cortical fields.

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Translated from Fiziologiya Cheloveka, Vol. 31, No. 5, 2005, pp. 58–67.

Original Russian Text Copyright © 2005 by Slavutskaya, Kirenskaya, Novototskii-Vlasov, Shul'govskii, Kozlovskaya.

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Slavutskaya, M.V., Kirenskaya, A.V., Novototskii-Vlasov, V.Y. et al. Slow Cortical Potentials Preceeding Visually Guided Saccades in Schizophrenics. Hum Physiol 31, 545–553 (2005). https://doi.org/10.1007/s10747-005-0095-z

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