Figure 2.

Schematic representation of the experimental fMRI design. Trials were announced by three transverse white bars that were presented for 0.5 seconds. Subsequently, GOT‐pens were presented twice, for 2 seconds, with a pause of 2 seconds between. Subjects rated the orientation (lw = lengthwise; cw =crosswise) of a stimulus pair, and immediately thereafter were given 4 seconds to rate their level of confidence associated with the preceding decision (guess; little=little certain; moderate=moderately certain; certain) within 4 seconds. A fixation cross was shown between trials. The long interstimulus intervals were required for technical reasons. Text and symbols are enlarged here for illustration clarity. Reprinted from Neuroimage, 99, Hilgenstock R, Weiss T, Witte OW, you'd better think twice: post‐decision perceptual confidence, 323‐331, Copyright 2014, with permission from Elsevier.