Thalamic and Cortical Mechanisms of Attention Suggested by Recent Positron Emission Tomographic Experiments
Thalamic and Cortical Mechanisms of Attention Suggested by Recent Positron Emission Tomographic Experiments
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最近的正电子发射断层扫描实验表明丘脑和皮质的注意力机制
DOI：
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发表时间：
1990
影响因子：
3.2
通讯作者：
D. LaBerge
中科院分区：
文献类型：
--
作者：
D. LaBerge
根据最近的PET数据，丘脑枕核中的注意力机制似乎参与了对混乱视野中某个位置的过滤。枕的机制被认为是一种特殊类型的电路，它将丘脑中继细胞与皮质细胞连接起来。这个回路是一般丘脑核的特征，似乎体现了一种算法，该算法增强了目标细胞组中的放电，同时抑制了周围细胞组中的放电。最近的PET研究还发现，当人类期望处理视觉对象的特定方面时，如位置，形状，颜色和运动速度，大脑皮层的特定区域显示出血流增加。对特定特征的期望可以被认为是跨皮层突触空间的峰值活动分布，其增加了该特征和与该特征类似的特征的感知的有效性（准确性和速度）。预期过程被认为是由丘脑增强回路产生的，而丘脑增强回路又是由认知过程驱动的，显然位于皮层的前扣带区。特定认知过程的选择被认为取决于通过与更深的边缘结构的连接而与之相关的瞬时相对动机价值。在通常情况下，具有主要激励价值的程序是被选择的程序。
An attention mechanism in the pulvinar nucleus of the thalamus appears to be involved in the filtering of a location in a cluttered visual field, according to recent PET data. The mechanism in the pulvinar is assumed to be a particular type of circuit that reciprocally connects thalamic relay cells to cortical cells. This circuit, which is characteristic of thalamic nuclei in general, appears to embody an algorithm that enhances firing in a target set of cells while inhibiting firing in the surrounding set of cells. Recent PET studies have also identified specific areas of cortex that show increased blood flow when humans expect to process particular aspects of visual objects, such as location, shape, color, and movement velocity. An expectation for a particular feature can be regarded as a peaked activity distribution across cortical synaptic space that increases the effectiveness (accuracy and speed) of the perception of that feature and features similar to that feature. The expectation process is assumed to be generated by a thalamic enhancement circuit, which in turn is driven by a cognitive procedure, apparently located in the anterior cingulate area of the cortex. The selection of a particular cognitive procedure is assumed to depend on the momentary relative motivational value associated with it by means of connections to deeper limbic structures. Under usual conditions, the procedure having the dominant motivational value is the one selected.
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影响因子：
56.9
作者：
CORBETTA, M;MIEZIN, FM;PETERSEN, SE
通讯作者：
PETERSEN, SE
影响因子：
56.9
作者：
POSNER, MI;PETERSEN, SE;RAICHLE, ME
通讯作者：
RAICHLE, ME
影响因子：
56.9
作者：
ANDERSEN, RA;ESSICK, GK;SIEGEL, RM
通讯作者：
SIEGEL, RM
DOI：
10.1073/pnas.87.1.256
发表时间：
1990-01-01
影响因子：
11.1
作者：
PARDO, JV;PARDO, PJ;RAICHLE, ME
通讯作者：
RAICHLE, ME