title: A case of a dual frame of reference.
abstract: It is demonstrated that observers may relate to two parts of the same object by using two different frames of reference. Subjects were asked to indicate directions within a model of a hallway in which signs were posted on a single prism. The majority of subjects interpreted a sign frontally facing them as indicating the direction which is ahead of them, yet they interpreted an adjacent sign that was slanted with respect to the frontal plane as indicating a direction which is at the same side of the line of sight as the sign is. This manifests a mixture of an egocentric and an object-centred frame of reference, that is reminiscent of the mixture of local spatial interpretations in impossible pictures. It is suggested that frames of reference are not necessarily unique in a given percept, and that they are not derived from a global computation.
authors.affiliation: Department of Psychology, University of Haifa, Israel.
authors.forename: D
authors.initials: D
authors.lastname: Navon
mesh_terms: D003071:Cognition; D005260:Female; D005556:Form Perception; D006801:Humans; D008297:Male; D009903:Optical Illusions; D009949:Orientation; D013028:Space Perception