Fig. 6.

(A) Proportion of choices of the box colour ‘blue’ as a function of the number of red boxes in the array (1–9), in the vmPFC, insular cortex, lesion control and healthy control groups. When blue boxes were in the majority (i.e. number of red boxes was 1–4), subjects in all four groups reliably selected ‘blue’. When red boxes were in the majority (i.e. number of red boxes was 6–9), subjects in all four groups reliably selected ‘red’. Given this intact processing of basic trial-by-trial probabilities, the differences in betting behaviour in the vmPFC and insular cortex groups are assumed to reflect differences in risk processing. (B) Decision latencies (in milliseconds) to select ‘red’ or ‘blue’ as a function of the number of red boxes in the array (1–9).