Figure 8.

Electrophysiological single-cell recordings from V4 of awake macaques. A–D, Representative orientation tuning curves of neurons in V4 of awake macaques in response to a single luminance-defined moving bar and a single moving illusory contour defined by perpendicular abutting lines. The lengths of the luminance bar and IC were identical. E, An example neuron showing responses to both illusory contour and inducer lines. F, An example neuron responsive to inducer lines only. Error bars in all tuning curves are SEM. The oriented bars below the abscissa represent the orientations of both the bar and IC, and the icons above tuning curves correspond to the actual preferred stimuli for each V4 neuron.