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Evoked potentials of the cerebral cortex during the comparison of visual stimuli

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Abstract

Visual evoked potentials (EP) were recorded when the test subjects accomplished the tasks of a comparison of a current stimulus with the previous one, the stimuli being presented in a continuous sequence. In the first task, rare repetition of two stimuli (Russian letters) in the continuously changing flow of stimuli was relevant, and the test subject had to press the button when it happened; in the second task, the relevant stimulus was a rare change in the flow of stimuli. The influence of the stimulus repetition/change factor on EP was analyzed. The processes related to the comparison of the current and previous stimuli were most manifest in four time intervals: 120–140, 180–210, 260–280, and 350–370 ms. The occipito-temporal component of EP revealed in the interval of 180–210 ms, which we denoted as the negative component of visual mismatch (NCVM), proved a special component, differing in its functional and temporal characteristics from theN 2b component. WhereasN 2b is modulated by the factor of stimulus probability, the NCVM by that of stimulus repetition/change.

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Authors and Affiliations

  1. Institute of the Human Brain, Russian Academy of Sciences, ul. Akademika Pavlova 9, 197022, St. Petersburg, Russia

    V. B. Nechaev, V. A. Klyucharev, Yu. D. Kropotov & V. A. Ponomarev

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  1. V. B. Nechaev
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  2. V. A. Klyucharev
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  3. Yu. D. Kropotov
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  4. V. A. Ponomarev
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Nechaev, V.B., Klyucharev, V.A., Kropotov, Y.D. et al. Evoked potentials of the cerebral cortex during the comparison of visual stimuli. Hum Physiol 26, 136–141 (2000). https://doi.org/10.1007/BF02760083

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  • DOI: https://doi.org/10.1007/BF02760083

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