Figure 7.
Comparison of speed tuning for sine-wave gratings and dot textures in V1 and MT neurons. A, Response as a function of stimulus speed for a typical V1 neuron. The gray circles and curve show speed tuning for gratings, estimated by averaging responses across iso-speed lines in the spatiotemporal response fields. The black circles and curve show responses to dot textures moving at different speeds. Curves were obtained by fitting Equation 2 to the data. B, Scatter plot comparing tuning width for gratings and dots in V1 neurons; light and dark gray symbols plot data for simple and complex cells. C, Scatter plot comparing tuning width for dots and gratings in MT neurons. The same analysis methods were used to compute the tuning width for gratings for V1 and MT neurons. In B and C, the oblique dashed line is the unity line.
