Figure 3.

Examples of firing rate changes in individual cells on day 1. (A) A proximal CA1 cell from rat 3 expressing a field on the cue-rich side of the track showed a typical pattern of directionality increase. Many cells (those falling in the category shown in Figure 5B) showed a directionality increase such as this. (B) Some cells expressed fields that started with significant directionality in the first few laps, such as the highlighted field of the intermediate CA1 cell shown here. Like this example, many cells in the category shown in Figure 5C increased their directionality even more after the first few laps. (C) An intermediate CA1 cell from rat 1 expressing a field on the cue-rich part of the track showed a small directionality increase. Many cells remained bi-directional throughout the session. (D) A few cells started directional and became less so, or reversed their preferred direction of firing (cells in the categories in Figure 5E,F). This intermediate CA1 cell from rat 1 didn't start firing until the return (clockwise) direction on the first lap, and then, over the next two laps, increased its firing rate in the counter-clockwise direction, eventually firing more spikes in that direction.