POSITRON-EMISSION TOMOGRAPHY STUDIES OF CROSS-MODALITY INHIBITION IN SELECTIVE ATTENTIONAL TASKS - CLOSING THE MINDS EYE
POSITRON-EMISSION TOMOGRAPHY STUDIES OF CROSS-MODALITY INHIBITION IN SELECTIVE ATTENTIONAL TASKS - CLOSING THE MINDS EYE
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DOI：
10.1073/pnas.92.13.5969
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发表时间：
1995-06-20
影响因子：
11.1
通讯作者：
ROLAND, PE
中科院分区：
文献类型：
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作者：
KAWASHIMA, R;OSULLIVAN, BT;ROLAND, PE
这是一个熟悉的经验，我们倾向于闭上我们的眼睛或转移我们的目光集中在认知要求的任务。我们报告了将注意力从潜在竞争的视觉处理转移到另一种感觉模式处理的相关大脑活动。本文报道了在“睁眼”和“闭眼”两种情况下，从事体感任务的人类大脑的一系列正电子发射断层扫描研究的结果。在这些任务中，视觉皮层区域的脑血流量显著减少，无论受试者是被要求闭上眼睛还是被要求睁着眼睛，都会出现这种情况。这些属于非相关感觉模态的关联区域的任务相关失活被解释为由于代谢活性降低。先前的研究已经清楚地表明，选择性激活的皮层区域涉及的注意力要求模式特定的任务；然而，这个故事的另一面似乎是有选择地关闭无人值守的地区。
It is a familiar experience that we tend to close our eyes or divert our gaze when concentrating attention on cognitively demanding tasks. We report on the brain activity correlates of directing attention away from potentially competing visual processing and toward processing in another sensory modality. Results are reported from a series of positron emission tomography studies of the human brain engaged in somatosensory tasks, in both ''eyes open'' and ''eyes closed'' conditions. During these tasks, there was a significant decrease in the regional cerebral blood flow in the visual cortex, which occurred irrespective of whether subjects had to close their eyes or were instructed to keep their eyes open. These task-related deactivations of the association areas belonging to the nonrelevant sensory modality were interpreted as being due to decreased metabolic activity. Previous research has clearly demonstrated selective activation of cortical regions involved in attention demanding modality-specific tasks; however, the other side of this story appears to be one of selective deactivation of unattended areas.