The pupil responds spontaneously to perceived numerosity

File psych.cvs: contains the perceptual biases for the two connectedness conditions and experiments. File pupil_mean1to6.cvs: contains the pupil difference in the interval 1-6 secs after stimulus onset measured for the four conditions tested in the two experiments. File pupil_beta_sust.cvs: contains the beta values (sustained component) estimated by the fitting procedure for the four conditions tested in the two experiments. File BCEA.cvs: contains gaze deviations quantified by the bivariate confidence interval area (BCEA) for the four conditions tested in the two experiments. File Brightness.cvs: contains data from brightness matching experiment