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Cognitive control of saccade programming in humanтезисы доклада
- Авторы: Slavutskaya M.V., Moiseeva V.V., Kotenev A.V., Karelin S.А., Shulgovskiy V.V.
- Сборник: International conference “Cognitive Control, Communication and Perception. Psychological and neurobiology aspects
- Тезисы
- Год издания: 2014
- Место издания: Moscow
- Первая страница: 47
- Последняя страница: 47
- Аннотация: Saccadic eye movements as an elementary form of goal-directed behavior can serve as a model for studying the mechanisms of saccade programming. In psychophysiology the cognitive function of attention and decision-making considered as the central stage of saccade programming at the latent period that precedes the target localization and saccade initiation. The nature of attention and decision-making processes and its interrelation remains unclear yet. The “double step” experimental scheme can be used to study this problem. Twenty healthy right-handed individuals take part in the experiments. Two short stimuli at the distance of 7 degrees from the central fixation point in one hemifield and 3 degrees from the central fixation point in the opposite one (or vice versa – “pulse-overshoot” scheme) were presented to the subjects on the display. Duration of the first target was set either 150 or 50 ms (50% probability). Duration of the second target ranged from 80 to 120ms. The experiment consisted of 700 -1000 experimental trials depend on subject. Behavioral (RT, % of errors) and ERP correlates of attention and decision making cognitive functions have been investigated during the saccade preparation. The slowing of sensorimotor integration as inhibitory effect of involuntary automatic shift of attention to the second stimulus in the early stages of visual perception was shown. Analysis of saccade latency, parameters and topography of ERP components identified that the pattern of saccade response (two or one saccades) depends on the completeness of attention and decision making stages at the first saccade programming to the moment of second stimulus presentation. Comparison of amplitude and topography of ERP component P100 in the case of double saccade response and P200 in the case of a single saccade to the second stimulus with their premotor analogue P -100, allow us to assess these potentials as a markers of decision making stage in saccade programming. The influence of the motor readiness level and directed attention orientation in the period of eye fixation and stimuli expectation on the “pattern” of saccadic response, regardless of visual targets location, was reflected in the amplitude and topography of slow negative components such as CNV. Obtained data suggest that the cognitive functions of attention and decision making are realized by fronto-parietal cortical neural networks including «top-down» mechanisms of saccade control and also fronto-media-thalamic- and thalami-parietal modulating systems. The pattern of saccade responses in double step scheme may be defined by direction of covert attention in the period of expectation. The study was supported by the RFBR (projects № 12-04-00719 and № 14-04-016341).
- Добавил в систему: Славуцкая Мария Валерьевна