Figure 2.

Average frequency histograms (bin size, 500 ms) from two units (unit A and unit B); firing in all trials is averaged together, regardless of icon (trial number in parentheses), horizontal (Hori.) or vertical (Vert.) stripes. The locations of the two units are indicated by triangles in brain section diagrams. (A) This unit increases the firing rate when the animal is presented with the visual icons in the cue period, and the tactile objects in the tactile choice period. The two insets show changes in short time scale (bin size, 50 ms). One inset averages discharges around the onset of the visual cue, and the other around the first contact with an object at choice. (B) Increased firing with the presentation of the cue. Firing stays elevated throughout the delay. This unit also responds to object touch.