Figure 11.

MT/V5 neuron (io152_F, eccentricity 5.2°) selective for second-order stimuli. A, Recording site in MT/V5 of monkey M. B, PSTHs plotting average responses to the 18 depth–structure conditions of the main test (2.5°/s, 4° size). C–E, Tuning curves for the different orders of depth structure at preferred (2.5°/s, solid line, same data as in B) and nonpreferred (1.25°/s, dashed line) speeds: main effect of condition, two-way ANOVA, p < 10⁻⁸; interaction between speed and second order, NS (second-order d′ = 1.98; separability index (r²) 3D shape–speed = 0.92). Main effects condition of other orders NS. Same conventions as in Figures 1 and 2.