Figure 6.

Empirical test of the predicted variation in nonlinear categorization as a function of visibility. (a) The present framework predicts that the steepness of the sigmoid characterizing discrimination performance as a function of λ should increase with visibility reports. In particular, the discrimination performance of unseen stimuli should follow a quasi-linear trend. (b) The results (n = 17) confirm that (i) stimuli could be identified above chance even at the lowest visibility ratings (ii) discrimination performance correlated with visibility ratings and (iii) increasingly steeper sigmoids indicated that, unlike unseen stimuli, visible stimuli were associated with a nearly all-or-none identification performance.