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首页> 外文期刊>The European Journal of Neuroscience >First- and second-order stimulus length selectivity in New World monkey striate cortex.
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First- and second-order stimulus length selectivity in New World monkey striate cortex.

机译：新大陆猴的纹状皮质中的一阶和二阶刺激长度选择性。

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摘要

Motion is a powerful cue for figure-ground segregation, allowing the recognition of shapes even if the luminance and texture characteristics of the stimulus and background are matched. In order to investigate the neural processes underlying early stages of the cue-invariant processing of form, we compared the responses of neurons in the striate cortex (V1) of anaesthetized marmosets to two types of moving stimuli: bars defined by differences in luminance, and bars defined solely by the coherent motion of random patterns that matched the texture and temporal modulation of the background. A population of form-cue-invariant (FCI) neurons was identified, which demonstrated similar tuning to the length of contours defined by first- and second-order cues. FCI neurons were relatively common in the supragranular layers (where they corresponded to 28% of the recorded units), but were absent from layer 4. Most had complex receptive fields, which were significantly larger than those of other V1 neurons. The majority of FCI neurons demonstrated end-inhibition in response to long first- and second-order bars, and were strongly direction selective. Thus, even at the level of V1 there are cells whose variations in response level appear to be determined by the shape and motion of the entire second-order object, rather than by its parts (i.e. the individual textural components). These results are compatible with the existence of an output channel from V1 to the ventral stream of extrastriate areas, which already encodes the basic building blocks of the image in an invariant manner.
机译：运动是人物与地面分离的有力提示，即使刺激和背景的亮度和纹理特征匹配，也可以识别形状。为了研究形式不变处理的早期阶段的神经过程，我们比较了麻醉的mos猴的纹状皮质（V1）中的神经元对两种类型的移动刺激的响应：由亮度差异定义的条形;以及条形图仅由与背景的纹理和时间调制相匹配的随机图案的相干运动定义。确定了一组形式不变的（FCI）神经元，这些神经元显示出对由一阶和二阶线索定义的轮廓长度的相似调整。 FCI神经元在颗粒上层相对较常见（它们对应于所记录单位的28％），但在第4层却不存在。大多数具有复杂的感受野，比其他V1神经元明显大。大多数FCI神经元对长的一阶和二阶条形反应都显示出末端抑制作用，并且具有强烈的方向选择性。因此，即使在V1的水平下，也存在其响应水平的变化似乎由整个二阶物体的形状和运动而不是由其部分（即各个纹理成分）决定的单元。这些结果与存在从V1到外部区域腹侧流的输出通道兼容，该输出通道已经以不变的方式编码了图像的基本构造块。

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