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EEG-correlates of visual-guided saccade programming in the “double step”paradigmтезисы доклада
- Авторы: Slavutskaya M.V., Moiseeva M.V., Kotenev A.V., Karelin S.A., Shulgovskiy V.V.
- Сборник: X International Congress “ for Medicine and Psychology”
- Тезисы
- Год издания: 2014
- Место издания: Судак. Крым. Россия
- Первая страница: 306
- Последняя страница: 306
- Аннотация: According to modern views the functions of attention and decision making control the saccadic programming. In psychophysiology the double step paradigm was elaborated for investigation of visual-guided saccade programming. We use modification of the double state paradigm in which two shot stimuli succeed presented in the different hemifields (pulse-overshoot scheme). 20 healthy right handed subjects took part in the study. The local EEG potential (P100, N100, P200 and N250) were included in the saccade latent period using the selective method of EEG averaging prior to saccade with mean latency (M±20ms). Parameters and topography of positive P100 и P200 components of evoked potential and their premotor analogs (P -100 или P -200) were studied depending on the response pattern (two saccade to each of the stimuli or only single saccade to the second stimulus). Obtained data allow us to suggest that the P100 component in the case of the double saccade response and P200 component in the case of the single saccade response may be EEG correlates of decision making stage in saccade programming. The Р100 component in the case of the single saccade response may reflect the stage of the first stimulus evaluation as the saccade target in the process of decision making. The P100 amplitude decrease in the case of the single saccade response may reflect the negative value of the first stimulus as saccade target and cancellation of the decision to initiate the first saccade in favor of the second stimulus. The space-temporal dynamic of the Р100 and Р200 components shows activation of divided fronto-parietal system of saccade control and the fronto- and parieto-medio-thalamic selective attention systems in decision making stage. Analyses of slow EEG averaging potentials (the CNV type) suggests that the responses pattern in the “double step” paradigm is also caused by the background fluctuation of activation level as well as the expectation and motor preparation processes in the period of eye fixation. The work was supported by the Foundation for Basic Research (projects № 14-04-01634 and №12-04-00719).
- Добавил в систему: Славуцкая Мария Валерьевна