期刊
NEUROREPORT
卷 11, 期 2, 页码 271-277出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/00001756-200002070-00010
关键词
attentional modulation; fMRI; visual cortex
We have used fMRI to examine the nature of the changes that occur in the human visual cortex when an observer attends to a particular location in the visual image. Previous studies have shown that the magnitude of the response to a visual stimulus is increased when the observer attends to the stimulus. We show that, in addition, attention to a particular location results in a widespread suppression of activity levels at all other locations. This suggests that a key mechanism of attentional modulation may be that spontaneous (baseline) levels of neural activity are adjusted in a position-dependent manner across the entire visual field. NeuroReport 11:271-277 (C) 2000 Lippincott Williams & Wilkins.
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