The physiological basis of attentional modulation in extrastriate visual areas
The physiological basis of attentional modulation in extrastriate visual areas
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DOI：
10.1038/10230
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发表时间：
1999-07-01
影响因子：
25
通讯作者：
Friston, KJ
中科院分区：
文献类型：
--
作者：
Chawla, D;Rees, G;Friston, KJ
对颜色或运动的选择性注意会增强纹外皮层特定区域的活动，但注意力调节机制仍不清楚。通过将视觉诱发的瞬时活动的调节与特定注意力组的基线分离，人类功能神经成像被用来研究这种效应的生理基础。即使没有移动或颜色刺激，通过选择性注意这些属性，也可以增强纹外皮层运动和颜色敏感区域的基线活动。此外，视觉诱发反应随着基线活动的增加而增加。这些结果与注意力通过改变背景活动来调节神经元群体对输入的敏感性的假设是一致的。
Selective attention to color or motion enhances activity in specialized areas of extrastriate cortex, but mechanisms of attentional modulation remain unclear. By dissociating modulation of visually evoked transient activity from the baseline for a particular attentional set, human functional neuroimaging was used to investigate the physiological basis of such effects. Baseline activity in motion- and color-sensitive areas of extrastriate cortex was enhanced by selective attention to these attributes, even without moving or colored stimuli. Further, visually evoked responses increased along with baseline activity. These results are consistent with the hypothesis that attention modulates sensitivity of neuronal populations to inputs by changing background activity.