Fig. 2
Shape-selective V4 neurons are tuned for blur. a–f For each neuron we plot the mean responses (y-axis) to several stimuli as a function of the magnitude of blur factor (x-axis, β). Line color indicates shape identity and is ordered from preferred (red) to non-preferred (blue) stimuli for each neuron based on responses to the sharp versions of each stimulus (β = 0.005). Error bars indicate s.e.m. a Responses of an example V4 neuron that was strongly selective to sharp stimuli, i.e., β = 0.005; responses declined gradually to baseline levels (dashed line) as blur magnitude was increased. b, c Two additional examples that also exhibited a monotonic decrease in responses with increasing blur. Unlike a, these neurons maintained their response level across low blur levels, sharply declining to baseline beyond a critical blur factor (β ≈ 0.16). d–f Example V4 neurons that respond best at intermediate levels of blur; responses for preferred stimuli dramatically increase for intermediate blur factors
