Figure 4
From: Coding of shape from shading in area V4 of the macaque monkey
Selectivity of 2 V4 neurons to 3D shapes illuminated from different directions. Peristimulus time histograms from two V4 cells in response to the different combinations of 3D shapes and illumination directions. Each row corresponds to a given 3D shape and each column corresponds to a given illumination direction (Below, Left, Right and Above), respectively. Second and third vertical lines on each PSTH represent stimulus on- and offset (250 ms duration). (A) A Neuron which is highly selective for 3D shape but weakly for illumination direction (ANOVA, main effect, 3D shape; p < 0.001, illumination direction; p = 0.046). (B) A Neuron which is highly selective for illumination direction but less for 3D shape (ANOVA, main effect, 3D shape; p = 0.006, illumination direction; p < 0.001).