Saccadic preparation at the experimental scheme with distractors during stimulation of leading and unleading eyeстатьяТезисы
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 9 марта 2017 г.
Аннотация:For successful goal-directed behaviour, it’s crucial to attend
relevant stimuli in the visual field while ignoring distractor elements.
The oculomotor system is a good model for the study of this
competition between different elements. The goal of this research
was to analyse spatial-temporal parameters of saccades and
presaccadic EEG-potentials at the simultaneous presentation of the
target and distracting stimuli to the leading and unleading eye. The
complex of the positive and negative potentials was revealed in the
saccade latent period. Latency of all components was shorter upon
presentation of stimuli to the left, unleading eye, that may indicate
the earlier saccade preparation. At the same time LP saccades were
longer in this conditions (p b 0.05). The results show that early
potentials N1 and P1 were higher in amplitude and dominated in the
contralateral parietal-occipital areas. It can be reflection of visual sensory processing. The amplitude of the later negative potential N2
at the stimulation of the right eye increased in the case when target
stimulus was at the same location than at the previous realisation.
It’s possible that N2 component is connected with processes of
preliminary extracting of motor program from memory together
with attention processes. N2 amplitude was higher when the
distance between target and distracting stimuli was 15 degrees in
comparison with the minimal distance 5 degrees. It’s corresponded
with LP data. The findings show an active role of attention and
decision-making processes in saccade programing. The study has
been funded by the Russian Academic Excellence Project '5-100' and
partially supported by RFBR (the projects № 12-04-00719).