Fig. 8.

Dissociation of information for decisions and information for confidence. A: schematic representation of the task used to dissociate the information that will lead to a decision from the information leading to a report of confidence. Positive evidence (PE) is the motion direction corresponding to the correct decision (response congruent evidence) whereas negative evidence (NE) corresponds to the opposite motion direction (response incongruent evidence). B: using isoluminant displays, the relative amount of positive and negative motion evidence can remain constant while the PE varies. We refer to these stimuli as d′ or Sensitivity-Matched stimuli. C: d′ is plotted for low-positive evidence (LPE) and high-positive evidence (HPE) for all data sets from both monkeys. Dark circles show trials from monkey P, and light gray circles show trials from monkey H. Total trial n = 26,668, 23 sessions. There were no significant differences in d′ between the HPE and LPE conditions (P > 0.05). D: proportion of trials in which monkeys chose the opt-out (OO) for the LPE and HPE conditions for the same data set shown in C. *P < 0.0001. Bars in C and D show SE.