Figure 5.

Responses during every training session for one cohort. Responses plotted for each rat (symbol-color) and each day of training. Session 1 is the second time the rats were placed into the behavioral box, and reward probability was p = 0.5 for each feeder regardless of previous responses or rewards. A, Number of trials completed in each session. Rats were allowed 90 min to complete up to 150 trials in sessions 1–10, and hallways of increasing lengths were introduced in sessions 3–8. B–D, Plot of the probability of responding to the rightward feeder, probability of lose-shift, and probability of win-stay during the first 16 sessions. The majority of rats showed no side bias, strong lose-shift, and very little win-stay in initial trials. Only a few rats showed initial side bias, and therefore little lose-shift and strong win-stay (blue shading in panels B–D). Lose-shift was invariant over training, whereas win-stay increased (see text). Dark lines indicate median across all subjects for each day.