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猴子颞下皮质中神经元的颜色、形状和图案选择性之间的关系。

Relationships between color, shape, and pattern selectivities of neurons in the inferior temporal cortex of the monkey.

作者信息

Komatsu H, Ideura Y

机构信息

Neuroscience Section, Electrotechnical Laboratory, Ibaraki, Japan.

出版信息

J Neurophysiol. 1993 Aug;70(2):677-94. doi: 10.1152/jn.1993.70.2.677.

Abstract
  1. To examine the way in which information from different visual submodalities is integrated in the inferior temporal (IT) cortex of the monkey, we studied the relationships between the color, shape, and pattern selectivities of individual neurons in IT cortex of two awake macque monkeys. Neurons were recorded while each animal performed a visual fixation task. For each neuron, we analyzed selectivity for the visual submodalities of color, contour shape, and textural pattern using preselected standard sets of visual stimuli, namely colored geometrical shapes with certain patterns. 2. About two thirds (62%) of single neurons whose activities were recorded from the anterior part of IT cortex, which included the ventral bank of the superior temporal sulcus, responded to one or more of the stimuli in the standard sets of stimuli used. An index (stimulus selectivity index) was calculated for each neuron to quantify how well a cell discriminated the preferred stimulus from the least preferred stimulus in each set of stimuli. The stimulus selectivity index, as well as the statistical significance of the variation in the responses to the stimuli within a given set, was used to classify a cell as selective or not selective in a given submodality. Of the neurons whose responses were analyzed quantitatively, 69% were selective for color, 68% were selective for shape, and 82% were selective for pattern. 3. Of the neurons that were tested with respect to the selectivity for color and for shape, 45% were selective both for color and shape, 50% were selective for either color or shape, and only 5% were not selective for color or shape. These frequencies were not significantly different from those predicted from the occurrence of the selective and nonselective neurons in each submodality if the independence of the selectivities for color and shape is assumed. We also found that the color preference of individual neurons does not depend on the shape of the stimulus. These results indicate that there was no overt interaction between the selectivities for color and shape in these IT neurons. 4. Of the neurons that were compared with respect to the selectivity for color and for pattern, 58% were selective both for color and pattern, 38% were selective for either color or pattern, and only 4% were not selective for color or pattern. There was no correlation between the degree of color selectivity and the degree of pattern selectivity of individual neurons.(ABSTRACT TRUNCATED AT 400 WORDS)
摘要
  1. 为了研究来自不同视觉子模态的信息在猴子颞下(IT)皮质中是如何整合的,我们研究了两只清醒猕猴IT皮质中单个神经元的颜色、形状和图案选择性之间的关系。在每只动物执行视觉注视任务时记录神经元活动。对于每个神经元,我们使用预先选定的标准视觉刺激集,即带有特定图案的彩色几何形状,分析其对颜色、轮廓形状和纹理图案等视觉子模态的选择性。2. 从IT皮质前部(包括颞上沟腹侧缘)记录活动的单个神经元中,约三分之二(62%)对所用标准刺激集中的一种或多种刺激有反应。为每个神经元计算一个指数(刺激选择性指数),以量化细胞在每组刺激中区分首选刺激和最不喜欢刺激的程度。刺激选择性指数以及对给定刺激集反应变化的统计显著性,用于将细胞分类为在给定子模态中具有选择性或无选择性。在定量分析反应的神经元中,69%对颜色有选择性,68%对形状有选择性,82%对图案有选择性。3. 在测试了颜色和形状选择性的神经元中,45%对颜色和形状都有选择性,50%对颜色或形状有选择性,只有5%对颜色和形状都无选择性。如果假设颜色和形状选择性相互独立,这些频率与每个子模态中选择性和非选择性神经元出现的预测频率没有显著差异。我们还发现单个神经元的颜色偏好不依赖于刺激的形状。这些结果表明,这些IT神经元中颜色和形状选择性之间没有明显的相互作用。

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