Figure 5.

SI as a metric applied to quantify the scaling of image size tuning. A, The schematic view of the Gauss·DoE function used to explain the response. In this function, the SI was used to denote whether the neuron represents object size or not. With an SI of 0, the cell responds best to a particular retinal image size regardless of the binocular disparity. With an SI of 1, the cell perfectly represents object size by changing its preferred retinal image size depending on the binocular disparity, and shows a tilted response field in the 2D plane of disparity tuning versus size tuning. B, The relationship between the SI and the scaling of the preferred image size with −0.25° binocular disparity when fixating on 57 cm distant plane. C, The distribution of the SIs for 63 V4 neurons. Arrowhead indicates the median SI (1.73). Filled columns represent significant scaling (sequential F test, p < 0.05).