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(FRAME-INFO (STRING "Cortical Eye Fields \(highly schematic representations\). Voluntary eye movements require connections between appropriate forebrain and brainstem regions.  The frontal eye field is located in the caudal part of the middle frontal gyrus. Electrical stimulation in this region causes conjugate deviation of the eyes to the opposite side; a lesion here would cause a patient to look toward the side of the lesion.  Additional regions of cortex \(a supplemental field in posterior part of superior frontal gyrus, extending onto the medial surface, and a parietal field in the intraparietal lobule region\) that are interconnected with the frontal field have been described. A poorly localized  parieto-occipital eye field, or center, has been reported in the posterior part of the cortex near the visual areas. It plays a role in the involuntary smooth pursuit movements that occur during visual tracking of a moving object. A lesion of this posterior cortex could impair tracking movement to a specific location, but the individual would still be able to voluntarily look to that location, a function of the frontal cortex center.  Brainstem centers essential for normal vertical and horizontal gaze will be shown in subsequent frames. "))
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