The reference frame of figure-ground assignment.
Figure-ground assignment involves determining which visual regions are foreground figures and which are backgrounds. Although figure-ground processes provide important inputs to high-level vision, little is known about the reference frame in which the figure's features and parts are defined. Computational approaches have suggested a retinally based, viewer-centered reference frame for figure-ground assignment, but figural assignment could also be computed on the basis of environmental regularities in an environmental reference frame. The present research used a newly discovered cue, lower region, to examine the reference frame of figure-ground assignment. Possible reference frames were misaligned by changing the orientation of viewers by having them tilt their heads (Experiments 1 and 2) or turn them upside down (Experiment 3). The results of these experiments indicated that figure-ground perception followed the orientation of the viewer, suggesting a viewer-centered reference frame for figure-ground assignment.
Vecera
Shaun P
SP
Department of Psychology, University of Iowa, Iowa City, IA 52242-1407, USA. shaun-vecera@uiowa.edu
D004777:Environment; D006801:Humans; D010364:Pattern Recognition, Visual; D011930:Reaction Time; D014796:Visual Perception
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