Figure 2
From: Adaptation to numerosity affects the pupillary light response

Results of the pupillometry and psychophysical experiments. (A) Average peak constriction in the 1 s time window around the peak for each test numerosity. Symbols represent average constriction across participants and error bars represent ± 1 SEM. (B) Perceived numerosity is plotted as a function of physical numerosity after adaptation to high (red curves and symbols) and low (blue curves and symbols) numerosities. Symbols represent average perceived numerosity across participants and error bars represent ± 1 SEM. (C) The difference between pupil traces during the two conditions (high and low) correlates significantly with the magnitude of individual perceptual adaptation.