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Participants were instructed to fixate the centre of adapting images throughout their presentation. After the adaptation period there was a 500?ms inter-stimulus-interval, during which a central fixation point was presented, followed by a test image presentation of 500?ms. Participants then completed a ternary classification task. During a run of trials each of seven test images was presented 20 times in a pseudo-random order according to the method of constant stimuli, yielding a total of 140 individual trials. Each run of trials provided a distribution of apparent image identity as a function of test image value. Logistic functions were fitted to ��lower�� and ��upper�� category responses using psignifit toolbox version 2.5.6 for Matlab (Wichmann & Hill, 2001), and 50% points were taken as estimates of the two category boundaries, at which an image was equally likely to be classified as belonging to that category, or to the mid-category. A point of subjective equality (PSE), which can be regarded as an estimate of the perceptual midpoint for the tested dimension, was estimated by taking the midpoint between the two category boundaries. Aftereffect magnitudes were calculated by taking the difference between PSE estimates from targeted baseline and adaptation runs of trials. Raw response data for each participant in each condition are shown in Fig. 3?and?Fig. 4 (facial configuration and facial gender), along with fitted logistic and Gaussian functions. As depicted in Fig. 5, each of our experimental conditions generated a perceptual aftereffect, as indicated by differences in PSEs from targeted baseline and adaptation runs of trials. In all cases average PSE values after adapting to a magenta coloured patch, to a pinched face, or to a male face were shifted toward the adapted value relative to baseline (colour paired t5?=??7.00, p?=?0.001; facial distortion t5?=??5.27, p?=?0.003; facial gender t5?=??3.11, p?=?0.026). Grey bars in Fig. 6 show the change in the proportion of trials that the adapting image was judged as being in the mid-category after adaptation, relative to baseline. In the colour condition the adaptor was rated as neutral more often after adaptation than before (mean proportion of ��grey�� responses pre-adaptation?=?0.23, ��SEM?=?0.10; post-adaptation?=?0.68?��?0.09, paired t5?=??4.56, p?=?0.006). This was also the case in the configural facial distortion condition (mean proportion of ��undistorted�� responses pre-adaptation?=?0.40, ��0.12; post-adaptation?=?0.69?��?0.11, t5?=??9.10, p?