Figure 12.

Simple model to explain the V4 response to the size of a cyclopean figure. A, Two binocular complex cells (excitatory unit and suppressive unit) based on the disparity energy model share their center with the cyclopean disk. The suppressive unit possesses a larger RF than that of the excitatory unit. B, The two units show disparity-tuning curves with slightly different phases and frequencies. These units change their responses according to the size of cyclopean disks but do not show size suppression. The subtraction of the two units generates a size-coding unit that shows size tuning curves with size suppression and a tilted response field similar to those of our recorded V4 neurons.