Supporting Information

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Fig. 5. Percent signal change for three key brain regions exhibiting choice-related responses (see Table 1), as in Fig. 3. Graphs display the average signal change relative to correct reject trials (reported fear absent during the presentation of neutral trials). For each subject and region, signals were obtained from the voxel with the peak choice probability value. Note that the responses evoked during reported fear-present trials (hits and false alarms) were similar to and greater than responses evoked during reported fear-absent trials (misses and correct rejects); responses to misses and correct rejects were also similar to each other. Error bars represent the standard error of the mean. L, left; R, right; CR, correct reject; FA, false alarm; and PCC, posterior cingulate cortex.

Fig. 6. Performance-related activity as obtained by the contrast of correct and incorrect trials. (Upper) Bilateral anterior fusiform gyrus (FG). (Lower) Right amygdala (Amyg)/entorhinal area (EA).

Fig. 7. Choice responses for constant physical stimuli. Group choice probability maps generated for fear-containing stimuli only. The general pattern of activation is similar to the one shown in Fig. 2.

Fig. 8. Group choice probability map with reversed hand-response mapping. An additional set of five participants was tested exactly as before aside from the reversed hand-response mapping. The pattern of choice-related activations was very similar to the one obtained before. In particular, right IFG voxels still reliably predicted behavioral choice when the response "fear" was indicated with the left hand. Note that choice-related signals were observed at sites slightly inferior to those observed before, although they were still lateralized to the right.

L, left; R, right; pos, posterior; ant, anterior.