出典:Wikipedia
出典:『Wikipedia』 (2011/07/22 04:27 UTC 版)
Pupillary response or dilation of the pupil is a physiological response that varies the size of the pupil of the eye via the iris dilator muscle. The response can have a variety of causes, from an involuntary reflex reaction to inexposure to light — in low light conditions a dilated pupil lets more light into the eye — or it may indicate interest in the subject of attention or indicate sexual stimulation. The pupils contract immediately before someone falls asleep. A pupillary response can be intentionally conditioned as a Pavlovian response to some stimuli.