Pulvinar neurons reveal neurobiological evidence of past selection for rapid detection of snakes.

Bibliographic Collection: 
Publication Type: Journal Article
Authors: Van Le, Quan; Isbell, Lynne A; Matsumoto, Jumpei; Nguyen, Minh; Hori, Etsuro; Maior, Rafael S; Tomaz, Carlos; Tran, Anh Hai; Ono, Taketoshi; Nishijo, Hisao
Year of Publication: 2013
Journal: Proc Natl Acad Sci U S A
Volume: 110
Issue: 47
Pagination: 19000-5
Date Published: 2013 Nov 19
Publication Language: eng
ISSN: 1091-6490
Keywords: Adaptation, Biological, Analysis of Variance, Animals, Biological Evolution, Macaca, Models, Biological, Neurons, Photic Stimulation, Pulvinar, Reaction Time, Recognition (Psychology), Snakes, Visual perception

Snakes and their relationships with humans and other primates have attracted broad attention from multiple fields of study, but not, surprisingly, from neuroscience, despite the involvement of the visual system and strong behavioral and physiological evidence that humans and other primates can detect snakes faster than innocuous objects. Here, we report the existence of neurons in the primate medial and dorsolateral pulvinar that respond selectively to visual images of snakes. Compared with three other categories of stimuli (monkey faces, monkey hands, and geometrical shapes), snakes elicited the strongest, fastest responses, and the responses were not reduced by low spatial filtering. These findings integrate neuroscience with evolutionary biology, anthropology, psychology, herpetology, and primatology by identifying a neurobiological basis for primates' heightened visual sensitivity to snakes, and adding a crucial component to the growing evolutionary perspective that snakes have long shaped our primate lineage.

DOI: 10.1073/pnas.1312648110
Alternate Journal: Proc. Natl. Acad. Sci. U.S.A.