Spatiotemporal properties of saccades elicited by two-dimensional target positionстатья
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Дата последнего поиска статьи во внешних источниках: 25 сентября 2013 г.
Аннотация:The spatial nonuniformity of saccadic properties was studied in macaque monkeys by measuring eye position with a magnetic search coil. Monkeys were trained to perform visually guided saccades by being required to detect the dimming of a small target (0.2 deg in size). The gap-overlap paradigm was used to elicit the saccades in single-step trials. Saccades were made from a central fixation point to a peripheral target at one of 34 possible locations (-19.5/+19.5 deg on the horizontal axes and -13/+13 deg on the vertical axis, at 6.5 deg spacing on both axes). The dependence of reaction time to visually guided, and the amplitudes of corrective and antici- patory saccades on peripheral target position was analyzed. The results revealed the presence of focuses of short-latency and long-latency saccades. These focuses were asymmetrically positioned in the visual field along both horizontal and vertical axes. The direction and amplitude of anticipatory saccades were asymmetrically distributed on the visual-field plane. It was shown that there are zones of more or less precise formation of visually-guided saccades. The present results point to the existence of a complicated asymmetry of oculomotor reactions in the visual field.