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Volume 17, Number 9, Issue of May 1, 1997 pp. 3201-3214
Copyright ©1997 Society for NeuroscienceSpatial Attention Effects in Macaque Area V4
Received Aug. 2, 1996; revised Dec. 6, 1996; accepted Jan. 22, 1997.
Charles E. Connor, Dean C. Preddie, Jack L. Gallant, and David C. Van Essen Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, Missouri 63110
Focal visual attention typically produces enhanced perceptual processing at the psychological level and relatively stronger neural responses at the physiological level. A longstanding mechanistic question is whether these attentional effects pertain specifically to the attended (target) object or to the region of space it occupies. We show here that attentional response enhancement in macaque area V4 extends to behaviorally irrelevant objects in the vicinity of the target object, indicating that focal attention has a strong spatial component at the physiological level. In addition, we find that spatial attention effects typically show a striking directional asymmetry. The direction of the asymmetry varies between cells, so that some cells respond best when attention is directed to the left of the stimulus, some when attention is directed to the right, etc. Thus, attention involves not only enhanced responses to behavioral targets but also a complex modulation of responses to other stimuli in the surrounding visual space.
Key words: attention; visual; spatial; monkey; cortex; extrastriate; area V4
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