Stimulus conflation and tuning selectivity in V4 neurons: a model of visual crowding.
Stimulus conflation and tuning selectivity in V4 neurons: a model of visual crowding.
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V4神经元中的刺激融合和调整选择性：视觉拥挤的模型。
DOI：
10.1167/18.1.15
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发表时间：
2018-01-01
影响因子：
1.8
通讯作者：
Motter BC
中科院分区：
文献类型：
--
作者：
Motter BC
视觉拥挤是我们在杂乱环境中识别外围物体的能力的基本限制。本研究提出了一个描述性的模型来理解拥挤的基础上的调谐选择性的刺激内的感受野（RF），并探讨潜在的神经相关的皮层V4区。对于V4神经元，最佳大小的字母样刺激比RF小得多。这使得刺激合并，即将不同的对象融合成一个单一的身份，发生在单个神经元的RF内。发现这些刺激之间的侧翼相互作用仅限于RF。对以神经元RF为中心的最佳刺激的响应被RF内的侧翼刺激的同时呈现所抑制。抑制的程度是神经元的刺激调谐特性和RF内侧翼的位置的函数。单个神经元可能表现出抑制或促进，这取决于详细的刺激条件和与调谐选择性的关系。在一组神经元的活动调整到一个特定的刺激的损失改变了其整体的代表性和潜在的识别，从而形成了视觉拥挤效应的基础。确定合并结果的机制与物体识别有关，而不是其他独立的视觉现象。
Visual crowding is a fundamental constraint on our ability to identify peripheral objects in cluttered environments. This study proposes a descriptive model for understanding crowding based on the tuning selectivity for stimuli within the receptive field (RF) and examines potential neural correlates in cortical area V4. For V4 neurons, optimally sized, letter-like stimuli are much smaller than the RF. This permits stimulus conflation, the fusing of separate objects into a single identity, to occur within the RF of single neurons. Flanking interactions between such stimuli were found to be limited to the RF. The response to an optimal stimulus centered in the neuron's RF, is suppressed by the simultaneous presentation of flanking stimuli within the RF. The degree of suppression is a function of the neuron's stimulus tuning properties and the position of the flanker within the RF. A single neuron may show suppression or facilitation depending on the detailed stimulus conditions and the relationship to tuning selectivity. Loss of activity in the set of neurons tuned to a particular stimulus alters its overall representation and potential identification, thus forming a basis for visual crowding effects. The mechanisms that determine the outcome of conflation are associated with object identification, and are not some other independent visual phenomena.
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