Figure 3:

Application to rat and human data. (a) For this data from [17], a 2AFC delayed response task was used in which the subject experiences an auditory stimulus (Tone A) of a particular amplitude, a delay period, a second auditory stimulus (Tone B) of a different amplitude, and finally the choice to go either left or right. If Tone A was louder than Tone B, then a rightward choice receives a reward, and vice-versa. (b) The psychometric weights recovered from the first 20,000 trials of a rat. Weights in the legend labeled with a “−1” superscript indicate that the weight carries information from the previous trial. The faded vertical gray lines indicate session boundaries. In addition to being fit with its own trial-to-trial volatility hyperparameter σ_k, each weight is also fit with an additional hyperparameter σ_k,day for volatility between sessions. This results in “steps” at the session boundaries for some weights (see Sec. 3.3). Each weight also has a 95% posterior credible interval, indicated by the shaded region of matching color (for derivation refer to Sec. S2). (c) The psychometric weights recovered from a human subject.