but to visceral response

in several prisons experiments for instance

eye movements)of sexual predators have been recorded with retina scanning measuring devices in hopes of "catching" the moment of "stimuli" to the nanometer(in terms of pupil fluctuation) during the prisoner's viewing of 20 minute video loops of random footage of pedestrians in a public park
beyond the "blink"tests heat sensing patches attached (in the guise of nicotine replacement adhesive) could measure the inmates temperature changes(flushing)in reactive "rebound"to the video...