کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6203659 1603220 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dissociation of pursuit target selection from saccade execution
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی سیستم های حسی
پیش نمایش صفحه اول مقاله
Dissociation of pursuit target selection from saccade execution
چکیده انگلیسی

Pursuit and saccades almost always select the same target. Is this the results of a common selection process or does smooth pursuit obligatorily follow the stimulus targeted by saccades? To address this question, we used microstimulation of the primate superior colliculus (SC) to redirect the eyes from a selected pursuit target to a distracter moving in the opposite direction. During each trial, monkeys pursued a horizontally moving array of colored target stimuli. In half of the trials, this target array was accompanied by a distracter array moving horizontally in the opposite direction, offset by the vertical amplitude of the stimulation-evoked saccade. We stimulated the SC during maintained pursuit on half of the trials, and measured pursuit eye velocity during the 50-ms interval immediately following the stimulation-evoked saccade to the distracter array. Saccades evoked by SC stimulation did not alter pursuit target selection. Pursuit velocity on average changed by less than 10% of that expected if the monkey had completely switched targets. Moreover, the same changes in velocity occurred when there was no distracter, indicating that even these small changes in pursuit velocity were a direct effect of the evoked saccade, not partial selection of the distracter. These results show that motor execution of saccades is not sufficient to select a pursuit target, and support the idea that the coordination of pursuit and saccades is accomplished by a shared target selection process.

► We tested whether pursuit eye movements automatically follow the target of saccades. ► Stimulation of the superior colliculus shifted gaze to a distracter during pursuit. ► Pursuit continued to follow the motion of the originally selected stimulus. ► Motor execution of saccades is not sufficient to select a target for pursuit.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vision Research - Volume 74, 1 December 2012, Pages 72-79
نویسندگان
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