Figure 2. Example RF maps. Each of the four images shows a spatiotemporal RF map. The axes are space (degrees), where 0 indicates the position of the fovea, and time (ms), where 0 is the time at which the neural data were recorded. The color represents luminance (z scored) and indicates the strength and sign of the RF. The black borders show the clusters in the space–time RF map that were significant (bootstrap test; see Materials and Methods). A, The spike RF of a single cell recorded in monkey S. B, The spike RF of a single cell from monkey N. C, D, The RF of the LFPs recorded at the same sites as the single cells in A and B, respectively. The black arrows indicate the estimated positions of the RFs. For a full description, see Results.