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J Neurophysiol 79: 2218-2221, 1998;
0022-3077/98 $5.00
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The Journal of Neurophysiology Vol. 79 No. 4 April 1998, pp. 2218-2221
Copyright ©1998 The American Physiological Society

RAPID COMMUNICATION


Attention-Regulated Activity in Human Primary Visual Cortex

Takeo Watanabe1, Yuka Sasaki2, Satoru Miyauchi2, Benno Putz2, Norio Fujimaki2, Matthew Nielsen2, Ryosuke Takino3, and Satoshi Miyakawa4

1 Department of Psychology, Boston University, Boston, Massachusetts 02215; 2 Communication Research Laboratory, Tokyo 184; 3 Shiraume Gakuen College 184, Tokyo; and 4 Frontier, Riken Institute, Saitama 351-01, Japan

Watanabe, Takeo, Yuka Sasaki, Satoru Miyauchi, Benno Putz, Norio Fujimaki, Matthew Nielsen, Ryosuke Takino, and Satoshi Miyakawa. Attention-regulated activity in human primary visual cortex. J. Neurophysiol. 79: 2218-2221, 1998. Effects of attention to a local contour of a moving object on the activation of human primary visual cortex (area V1) were examined. Local cerebral oxygenation changes (an index of neuronal activity) in human area V1 were measured with functional magnetic resonance imaging (fMRI) in conditions including the following two: 1) when attention was selectively directed toward one side of a moving wedge (the attention condition) and 2) when the wedges were viewed passively (the passive condition). Activation in area V1 was found to be higher in the attention condition than in the passive condition. To our knowledge, this is the first finding that attention to motion activates as early as area V1. We suggest that attentional activation of area V1 is task dependent.




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