Journal of Neurophysiology, Vol 75, Issue 1 454-468, Copyright © 1996 by APS

ARTICLES

Positron emission tomography study of voluntary saccadic eye movements and spatial working memory

J. A. Sweeney, M. A. Mintun, S. Kwee, M. B. Wiseman, D. L. Brown, D. R. Rosenberg and J. R. Carl
Department of Psychiatry, University of Pittsburgh School of Medicine, Pennsylvania 15213, USA.

1. The purpose of this study is to define the cortical regions that subserve voluntary saccadic eye movements and spatial working memory in humans. 2. Regional cerebral blood flow (rCBF) during performance of oculomotor tasks was measured with [15O]-H2O positron emission tomography (PET). Eleven well-trained, healthy young adults performed the following tasks: visual fixation, visually guided saccades, antisaccades (a task in which subjects made saccades away from rather than toward peripheral targets), and either an oculomotor delayed response (ODR, a task requiring memory-guided saccades after a delay period) or a conditional antisaccade task (a task in which the color of the peripheral target determined whether a saccade toward or away from the target was required). An additional six subjects performed a sequential hand movement task to compare localization of hand-related motor cortex and the frontal eye fields (FEFs) and of the hand- and eye-movement-related regions of the supplementary motor area (SMA). 3. Friston's statistical parametric mapping (SPM) method was used to identify significant changes in rCBF associated with task performance. Because SPM does not take advantage of the anatomic information available in magnetic resonance (MR) scans, each subject's PET scan was registered to that individual's MR scan, after which all PET and MR studies were transformed to conform to a standard reference MR image set. Subtraction images were visually inspected while overlayed on the reference MR scan to which PET images had been aligned, in order to confirm anatomic localization of significant rCBF changes. 4. Compared with visual fixation, performing visually guided saccades led to a significant bilateral activation in FEF, cerebellum, striate cortex, and posterior temporal cortex. Right posterior thalamus activation was also observed. 5. The visually guided saccade task served as the comparison task for the ODR, antisaccade, and conditional antisaccade tasks for identification of task-related changes in rCBF beyond those associated with saccade execution. Performance on the ODR task was associated with a bilateral increase of rCBF in FEFs, SMA, dorsolateral prefrontal cortex (DLPFC), and posterior parietal cortex. The cortical regions of increased regional blood flow during the ODR task also showed increased rCBF during the antisaccade task; however, FEF and SMA activations were significant only in the right hemisphere. These findings closely parallel those of single-cell recording studies with behaving monkeys in indicating that FEF, DLPFC, SMA, and posterior parietal cortex perform computational activity for voluntary purposive saccades. 6. Comparison of PET scans obtained during performance of eye movement and hand movement tasks indicated that peak activations in FEF were located approximately 2 cm lateral and 1 cm anterior to those of hand-related motor cortex. The oculomotor area of SMA, the supplementary eye field (SEF), was located approximately 7-8 mm anterior and superior to the hand-related area of SMA. 7. During performance of antisaccade and ODR tasks, rCBF was significantly lower in ventromedial prefrontal cortex (PFC), along the rectus gyrus, and in ventral anterior cingulate cortex than during the visually guided saccade and fixation tasks. During the antisaccade task, the ventral region of lower rCBF involved medial structures including left ventral striatum and bilateral medial temporal-limbic cortex. During the ODR task, the ventral aspect of the region of lower rCBF extended laterally, rather than medially, to include the temporal poles. The lower blood flow observed in ventromedial PFC during both the antisaccade and ODR tasks, relative to the visually guided saccade and fixation tasks, suggests that modulation of output from ventromedial PFC to limbic cortex and the striatum may play a role in the voluntary control of saccadic eye movements, possibly in the suppression of responses that would interrupt

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