Fig. 1.
Psychometric functions of nose poke rates over 10 different train durations (100–1000 ms in 100 ms increments). Each train duration was given for 30 s in randomized order. A Weibull function was fitted to the nose poke responses. (A) Example of a psychometric function from a single subject. (B) Average psychometric function from the last session of all experimental subjects prior to training.