Fig. 2.

Aggregate behavioral performance across subjects. For A–E, performance is shown for 2 conditions. Black data points correspond to the false alarm averse condition, and red data points correspond to the false alarm prone condition. Note that subjects varied in whether they were false alarm prone or averse at baseline, so the categories correspond to a mixture of data from the baseline and instructed sessions. A: the proportion of hit trials plotted as a function of the change (Δ) in stimulus click rate. Non-hit trials consist of both false alarms and misses. B: miss rate plotted as a function of the change in stimulus click rate. Miss rate is defined as the proportion of trials where a stimulus change was present but failed to be detected. Importantly, this does not include false alarm trials in the denominator of the calculation, so changes in miss rate are not confounded with changes in false alarm rate. These definitions explain why miss rate does not equal 1 minus hit rate, and why the sum of hit, miss, and false alarm rates does not equal 1. C: false alarm rate plotted for each condition. False alarms occur before the stimulus change, so they cannot depend on its magnitude. D: correct reject rate for catch trials interleaved in each of the 2 conditions. E: RTs on correct (hit) trials plotted as a function of the change in the stimulus click rate. Larger click rate changes are associated with faster RTs. Error bars indicate SE; n = 7 subjects, 14,243 trials.