Shape Tuning in Macaque Inferior Temporal Cortex
Shape Tuning in Macaque Inferior Temporal Cortex
复制标题
猕猴下颞叶皮层的形状调节
作者：
G. Kayaert;I. Biederman;R. Vogels
猕猴的下颞叶皮层（IT）中的神经元对某些形状的反应比其他形状更强烈，但人们对如何更普遍地表征这种形状调节知之甚少，因为大多数先前的研究都是在刺激中使用一些任意的变化，变化幅度不详。本研究研究了IT细胞对非偶然属性（NAP，即深度方向不变）和度量属性（MP，即深度依赖）广义锥（一种用于表征假设介导物体识别的形状的一般形式）尺寸变化的调制。NAP的变化比MP的同样大的像素变化（包括由深度旋转组成的变化）导致更大的神经元调制。也有精确和高度系统的神经元调整，以定量变化的MPs沿着特定的维度，神经元是敏感的。NAP的优势与物体是由单一部分组成还是由两个部分组成无关。这些发现表明，定性的形状变化（如nap）有助于解释IT形状敏感性的剩余量，而这些变化不能仅根据度量或基于像素的变化来解释。这种NAP的优势可能为NAP在人类心理物理中比MP的变化更容易被检测提供了神经基础。
Neurons in the inferior temporal cortex (IT) of the macaque fire more strongly to some shapes than others, but little is known about how to characterize this shape tuning more generally, because most previous studies have used somewhat arbitrary variations in the stimuli with unspecified magnitudes of the changes. The present investigation studied the modulation of IT cells to nonaccidental property (NAP, i.e., invariant to orientations in depth) and metric property (MP, i.e., depth dependent) variations of dimensions of generalized cones (a general formalism for characterizing shapes hypothesized to mediate object recognition). Changes in an NAP resulted in greater neuronal modulation than equally large pixel-wise changes in an MP (including those consisting of a rotation in depth). There was also precise and highly systematic neuronal tuning to the quantitative variations of MPs along specific dimensions to which a neuron was sensitive. The NAP advantage was independent of whether the object was composed of only a single part or had two parts. These findings indicate that qualitative shape changes such as NAPs help explain the surplus amount of IT shape sensitivity that cannot be accounted for on the basis of metric or pixel-based changes alone. This NAP advantage may provide the neural basis for the greater detectability of NAP compared with MP changes in human psychophysics.
登录
查看更多内容
影响因子：
2.5
作者：
Jagadeesh, B;Chelazzi, L;Desimone, R
通讯作者：
Desimone, R
影响因子：
2.5
作者：
Gallant, JL;Connor, CE;VanEssen, DC
通讯作者：
VanEssen, DC
基于视图的 3D 对象识别模型：成像变换的不变性。
DOI：
10.1093/cercor/5.3.261
发表时间：
1995
期刊：
Cerebral cortex (New York, N.Y. : 1991)
影响因子：
--
作者：
Vetter,T;Hurlbert,A;Poggio,T
通讯作者：
Poggio,T
三维形状视觉表示中独立维度的经验证据。
DOI：
--
发表时间：
2002
期刊：
Journal of experimental psychology. Human perception and performance.
影响因子：
--
作者：
Stankiewicz,BrianJ
通讯作者：
Stankiewicz,BrianJ