title: Transient pupil response is modulated by contrast-based saliency.
abstract: The sudden appearance of a novel stimulus in the environment initiates a series of orienting responses that include coordinated shifts of gaze and attention, and also transient changes in pupil size. Although numerous studies have identified a significant effect of stimulus saliency on shifts of gaze and attention, saliency effects on pupil size are less understood. To examine salience-evoked pupil responses, we presented visual, auditory, or audiovisual stimuli while monkeys fixated a central visual spot. Transient pupil dilation was elicited after visual stimulus presentation regardless of target luminance relative to background, and auditory stimuli also evoked similar pupil responses. Importantly, the evoked pupil response was modulated by contrast-based saliency, with faster and larger pupil responses following the presentation of more salient stimuli. The initial transient component of pupil dilation was qualitatively similar to that evoked by weak microstimulation of the midbrain superior colliculus. The pupil responses elicited by audiovisual stimuli were well predicted by a linear summation of each modality response. Together, the results suggest that the transient pupil response, as one component of orienting, is modulated by contrast-based saliency, and the superior colliculus is likely involved in its coordination.
authors.affiliation: Centre for Neuroscience Studies, Queen's University, Kingston, Ontario K7L 3N6, Canada, and Department of Computer Science, University of Southern California, Los Angeles, California 90089-0781.
authors.forename: Chin-An
authors.initials: CA
authors.lastname: Wang
authors.forename: Susan E
authors.initials: SE
authors.lastname: Boehnke
authors.forename: Laurent
authors.initials: L
authors.lastname: Itti
authors.forename: Douglas P
authors.initials: DP
authors.lastname: Munoz
mesh_terms: D000161:Acoustic Stimulation; D000818:Animals; D008253:Macaca mulatta; D008297:Male; D009949:Orientation / Q000502:physiology*; D010775:Photic Stimulation; D011680:Pupil / Q000502:physiology*; D013477:Superior Colliculi / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*
keywords: microstimulation; orienting; pupil response; saliency; stimulus contrast; superior colliculus