A neural model of figure-ground organization
A neural model of figure-ground organization
复制标题
图形-地面组织的神经模型
DOI：
10.1152/jn.00203.2007
复制
发表时间：
2007-06-01
影响因子：
2.5
通讯作者：
von der Heydt, Ruediger
中科院分区：
文献类型：
--
作者：
Craft, Edward;Schuetze, Hartmut;von der Heydt, Ruediger
心理物理学研究表明，图形-背景组织在很大程度上是一个自主的过程，它指导——因而先于——注意力和物体识别的分配。早期视觉皮层单个神经元中边界所有权表征的发现证实了这一观点。最近的理论研究表明，边界所有权分配可以被建模为V2皮层内横向相互作用的自组织过程。然而，提出的机制依赖于信号通过水平纤维的传播，这将导致边界所有权信号随着视觉刺激大小的增加而增加延迟，这与实验结果相矛盾。目前还不清楚由此产生的边界所有权表示将如何与注意力机制相互作用，以指导进一步的处理。在这里，我们提出了一个基于专用神经电路的边界所有权编码模型，用于轮廓分组，产生边界所有权分配，并为选择性注意机制提供处理。结果与神经生理学和心理物理学的发现一致。该模型预测了假设的分组电路和皮层区域之间反馈的作用。
Psychophysical studies suggest that figure-ground organization is a largely autonomous process that guides-and thus precedes-allocation of attention and object recognition. The discovery of border-ownership representation in single neurons of early visual cortex has confirmed this view. Recent theoretical studies have demonstrated that border-ownership assignment can be modeled as a process of self-organization by lateral interactions within V2 cortex. However, the mechanism proposed relies on propagation of signals through horizontal fibers, which would result in increasing delays of the border-ownership signal with increasing size of the visual stimulus, in contradiction with experimental findings. It also remains unclear how the resulting border-ownership representation would interact with attention mechanisms to guide further processing. Here we present a model of border- ownership coding based on dedicated neural circuits for contour grouping that produce border-ownership assignment and also provide handles for mechanisms of selective attention. The results are consistent with neurophysiological and psychophysical findings. The model makes predictions about the hypothetical grouping circuits and the role of feedback between cortical areas.