Fig. 3.

Example neuron illustrating spiral and FOE tuning of an MSTd neuron. Neural responses were averaged for at least 20 repetitions. The error bar is the standard error of the mean (SEM). Firing rate is measured in spikes per second. A: spiral tuning of the neuron in polar coordinates: average neural responses were plotted as the distance from the center. This neuron is tuned to Exp and counterclockwise (CCW) motion, spiral motion. B: the same neuron's FOE tuning: average neural responses were plotted as a function of FOE. This neuron responds strongly for a rightward FOE, about 30° to the right.