Figure 2.

Spatial firing characteristics of a hippocampal PC in a rat performing the pellet chasing task in a uniformly illuminated arena (2 m in diameter) before (A) and after introduction of the zero visibility are zones in the south (B) or west (C). (Lower) The tracks of the animal during 10-min recording sessions. The zero-visibility zones are indicated by dark tracking lines. The median firing rates from yellow to purple are 0.0, 0.2, 0.4, 1.0, 1.3, and 6.0 for A; 0.0, 0.1, 0.3, 0.4, 0.5, and 0.6 for B; and 0.0, 0.1, 0.4, 0.6, 0.8, and 2.9 for C. (See text for a quantitative evaluation of the maps.)