Figure 5

Superior colliculus neurons display a high degree of angular selectivity. A: To determine angular selectivity, vibrissae were deflected in eight directions. ON responses in each direction were used to compute the selectivity index (SI) and create the polar tuning curve (center). Distance from the center in the polar tuning curve represents the magnitude of the response for deflections in that direction. Octagon radii represent one spike/stimulus. B: A well-tuned neuron (SI = 5). C: A poorly tuned neuron (SI = 1). Histograms in D and E depict the SIs for all neurons tested, either considering only responses to the vibrissa evoking the largest response in each neuron (D); or considering all vibrissa-neuron pairs (E).