Neural correlates of 3D structure-from-motion. a, Visual stimuli used in the experiments; b, relationship between spike rates of MT neurons and the monkeys' perceptual decisions on ambiguous trials. Distribution of choice probabilities from 93 MT neurons selective for direction of disparity-defined rotating cylinder. Filled bars, Neurons with a choice probability significantly different from 0.5 (40 of 93 neurons). [Dodd et al. (2001), their Figs. 1, 5, reproduced with permission.] −ve, Negative; +ve, positive; CW, clockwise; CCW, counterclockwise.