Figure 9.

Serial and direct tracks diverge early after holding chamber. Tracks until the first entry shown for different compartments (a, e, C1; b, d, f, C2; c, C5) in direct (blue) and serial (red) trials. a–c, Non-overlapping tracks, whereas d–f show overlapping tracks for both direct and serial trials. First entries in direct trials are to the correct odor compartment, whereas first entries in the serial trials are to the incorrect compartment. Each panel shows tracks from a single session of an example rat as indicated in the plot. g, Deviation from odor plume (cm) as a function of distance from first entered compartment (cm) averaged over all rats, shown for both direct (blue) and serial (red) trials. h, Example data from two rats showing deviation from odor plume in the initial 20 cm from holding chamber. Rat B shows divergence of deviation for direct and serial trials after the 70 cm mark, where as all other rats show divergence from the beginning of the holding chamber (100 cm). i, Instantaneous speed averaged over all rats for every 1 cm toward first compartment entered. Higher speed at 110 cm indicates turning of the animals from water port. At ∼70 cm, the direct and serial speeds begin to diverge from each other.