Magnification, receptive-field area, and "hypercolumn" size in areas 3b and 1 of somatosensory cortex in owl monkeys.
Magnification, receptive-field area, and "hypercolumn" size in areas 3b and 1 of somatosensory cortex in owl monkeys.
复制标题
猫头鹰猴体感皮层 3b 和 1 区的放大倍数、感受野面积和“超柱”大小。
DOI：
10.1152/jn.1980.44.2.295
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发表时间：
1980
影响因子：
2.5
通讯作者：
J. Kaas
中科院分区：
文献类型：
--
作者：
M. Sur;M. Merzenich;J. Kaas
1. 定量研究了鸮猴体感皮层3b区和1区对侧体表完整和独立表征的若干特征。2. 得到了两种表征中不同身体区域的面积放大因子。研究发现，无毛的手和脚区域每单位体表面积所占的皮质组织比躯干或上臂多近100倍。3. 在手部数字的表示中，反向放大倍数与到手指尖端的距离成线性关系。4. 接受场的大小被发现与整个体表的反比放大成正比，也与无毛手指的局部区域成正比。接收场大小与反放大倍数呈线性关系；对其中一个的说明将在一个区域的表示上指定另一个。5. 通过将接受野重叠与距离分离的记录位点联系起来，得到了假定接收来自任何给定接受野的所有纤维的皮层区域，并发现该区域独立于所代表的体表。这样的体感皮层区域，直径约为11.5毫米，可能类似于初级视觉皮层的“超柱”(6)。
1. Several features of the two complete and separate representations of the contralateral body surface in cortical areas 3b and 1 of somatosensory cortex in owl monkeys were quantitatively studied. 2. Area1 magnification factors for different body regions in the two representations were obtained. The glabrous hand and foot regions were found to occupy nearly 100 times more cortical tissue per unit body-surface area than the trunk or upper arm. 3. In the representations of the hand digits, inverse magnification was linearly related to distance from the digit tips. 4. Receptive-field size was found to be proportional to inverse magnification over the entire body-surface representation as well as over the local region of the glabrous hand digits. The relation between receptive-field size and inverse magnification appears to be linear; specification of one would specify the other over the representation in one area. 5. By relating receptive-field overlap to distance separating recording sites, the area of cortex presumed to receive all fibers from any given receptive field was obtained and found to be independent of the body surface represented. Such an area of somatosensory cortex, about l1.5 mm in diameter, may be akin to the “hypercolumn” proposed for primary visual cortex (6).