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A–D: internal curvature bias (i.e., the Gaussian mean of the curvature-channel population output) and noise (i.e., the Gaussian standard deviation of the channel-population output) in response to a straight segment estimated from 8-stimulus curvature-absent trials in experiment 2, shown along with the slopes for the correlation between reported curvature and confidence. The formats and labels are identical to those in Fig. 4, which presents similar data from experiment 1.
