title: Perceiving depth in point-light actions.
abstract: The present study investigates how observers assign depth in point-light figures, by manipulating spatiotemporal characteristics of the stimuli. Previous research on the perception of point-light walkers revealed bistability (i.e., that a point-light walker is perceived as either facing the viewer or facing away from the viewer) and the presence of a perceptual bias (i.e., a tendency to perceive the figure as facing the viewer). Here, we study the generality of these phenomena by having observers indicate the global depth orientation of different ambiguous point-light actions. Results demonstrate bistability for all actions, but the presence of a preferred interpretation depends strongly on the performed action, showing that the process of depth assignment takes into account the movements the point-light figure performs. Two additional experiments, using unfamiliar movement patterns without strong semantic correlates, show that purely kinematic aspects of a naction also strongly affect d epth assignment. Together, the results reveal the perception of depth in point-light figures to be a flexible processinvolving both bottom-up and top-down components.
authors.affiliation: Katholieke Universiteit Leuven, Leuven, Belgium.
authors.forename: Jan
authors.initials: J
authors.lastname: Vanrie
authors.forename: Karl
authors.initials: K
authors.lastname: Verfaillie
mesh_terms: D003867:Depth Perception; D005121:Extremities / Q000502:physiology; D006801:Humans; D008027:Light; D009039:Motion Perception; D009068:Movement / Q000502:physiology; D014796:Visual Perception