title: Pupil dilation reflects perceptual selection and predicts subsequent stability in perceptual rivalry.
abstract: During sustained viewing of an ambiguous stimulus, an individual's perceptual experience will generally switch between the different possible alternatives rather than stay fixed on one interpretation (perceptual rivalry). Here, we measured pupil diameter while subjects viewed different ambiguous visual and auditory stimuli. For all stimuli tested, pupil diameter increased just before the reported perceptual switch and the relative amount of dilation before this switch was a significant predictor of the subsequent duration of perceptual stability. These results could not be explained by blink or eye-movement effects, the motor response or stimulus driven changes in retinal input. Because pupil dilation reflects levels of norepinephrine (NE) released from the locus coeruleus (LC), we interpret these results as suggestive that the LC-NE complex may play the same role in perceptual selection as in behavioral decision making.
authors.affiliation: Division of Biology, California Institute of Technology, Pasadena, CA 91125, USA.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Einhäuser
authors.forename: James
authors.initials: J
authors.lastname: Stout
authors.forename: Christof
authors.initials: C
authors.lastname: Koch
authors.forename: Olivia
authors.initials: O
authors.lastname: Carter
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D008125:Locus Coeruleus / Q000502:physiology*; D008297:Male; D009638:Norepinephrine / Q000378:metabolism; D011680:Pupil / Q000502:physiology*; D015348:Vision, Binocular / Q000502:physiology*; D014796:Visual Perception
chemical_list: D009638:Norepinephrine