Performance as a function of size set in a change-detection task. A, Experimental scheme of a change-detection task. In each trial, network views a cue array (with 2, 4, 6 or 8 colors) and a test array (with the same set size as the cue), separated by a 1 s delay, and identifies whether they are the same. In half of the trials, the test arrays are identical to the cue arrays, namely same trials, where the amplitude of change is 0°, while in the other half of the trials, one color in the cue array is changed to a color with an amplitude from 10° to 90° away from its value, namely diff trials. B, A downstream match-nonmatch neural circuit underlies the probability of responding to same. C, Hit rate decreases and false-alarm rate increases as a function of set size. D, Psychometric curves show the probability to respond to different as a function of the amplitude of change, |θ_in − θ_test|, for different set sizes. E, Performance curve from CDT mimics that from DRT, showing that the change-detection performance (the probability of correct response) would decrease when the set size increases.