Objective pupillometry shows that perceptual styles covary with autistic-like personality traits

We measured the modulation of pupil size (in constant lighting) elicited by observing transparent surfaces black and white moving dots, perceived as a cylinder rotating about its vertical axis. The direction rotation was swapped periodically flipping stereo-depth two surfaces. Pupil modulated in synchrony with changes front-surface color (dilating when black). magnitude pupillary larger for human participants higher Autism-Spectrum Quotient (AQ), consistent local perceptual style, attention focused on front surface. surface color, correlation AQ, equally strong passively viewed stimulus. No other indicator, including involuntary pursuit eye movements, covaried AQ. These results reinforce our previous report similar bistable stimulus (Turi, Burr, & Binda, 2018), go to show that illusory motion is not necessary effect, or dependence