FIGURE 3. Activity of six neurons.

For each cell, the top panel shows the choice pattern, with the relative value indicated on the top left. The bottom panel shows the activity of the cell. a–c, Responses encoding the chosen value. The response in c is negatively correlated with the chosen value (high activity for low value). d–e, Responses encoding the value of juice A offered (d) and the value of juice B offered (e). We refer to these responses as related to the offer value. f, Response encoding the juice taste. Here we separate trials in which the monkey chose juice A (diamonds) or juice B (circles). The response reflects the chosen juice type independently of the amount. Responses were recorded in the post-offer (a, d, e, blue), pre-juice (b, cyan), and post-juice (c, f, black) time windows. For each cell, the curves in light grey show the activity in the pre-offer time window. Error bars represent s.e.m.