SHIFTER CIRCUITS - A COMPUTATIONAL STRATEGY FOR DYNAMIC ASPECTS OF VISUAL PROCESSING
SHIFTER CIRCUITS - A COMPUTATIONAL STRATEGY FOR DYNAMIC ASPECTS OF VISUAL PROCESSING
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DOI：
10.1073/pnas.84.17.6297
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发表时间：
1987-09-01
影响因子：
11.1
通讯作者：
VANESSEN, DC
中科院分区：
文献类型：
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作者：
ANDERSON, CH;VANESSEN, DC
我们提出了一个总体战略，在不同层次的视觉通路的神经元阵列之间的信息流的动态控制，开始在外侧膝状体核和geniculorecipient层的皮质区VI。该策略可用于解决立体视觉、定向视觉注意和运动图像感知领域中的计算问题。在这些情况中的每一种情况下，动态控制视网膜输出如何映射到更高级别目标的一些手段是为了实现双眼融合，以允许注意力焦点的转移，并防止运动图像的模糊。desirable.sbd.in所提出的解决方案涉及我们所谓的“移位器电路”，它允许动态移位的输入和输出阵列的相对对齐，而不会损失本地空间关系。这些变化是沿着一系列由不同的兴奋性输入连接的继电器级以沿着的方式产生的。转移的方向在每个阶段都由抑制性神经元控制，这些神经元选择性地抑制适当的上行输入。移位假说与灵长类动物视觉通路组织的解剖学和生理学证据相一致，它为各种其他令人困惑的事实提供了合理的解释，例如VI的geniculoreceptors层中的细胞过多。
We propose a general strategy for dynamic control of information flow between arrays of neurons at different levels of the visual pathway, starting in the lateral geniculate nucleus and the geniculorecipient layers of cortical area VI. This strategy can be used for resolving computational problems arising in the domains of stereopsis, directed visual attention, and the perception of moving images. In each of these situations, some means of dynamically controlling how retinal outputs map onto higher-level targets is desirable.sbd.in order to achieve binocular fusion, to allow shifts of the focus of attention, and to prevent blurring of moving images. The proposed solution involves what we term "shifter circuits", which allow for dynamic shifts in the relative alignment of input and output arrays without loss of local spatial relationships. The shifts are produced in increments along a succession of relay stages that are linked by diverging excitatory inputs. The direction of shift is controlled at each stage by inhibitory neurons that selectively suppress appropriate sets of ascending inputs. The shifter hypothesis is consistent with available anatomical and physiological evidence on the organization of the primate visual pathway, and it offers a sensible explanation for a variety of otherwise puzzling facts such as the plethora of cells in the geniculorecipient layers of VI.