Kemt A. Stevens

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Human vision is adept at inferring surface shape from a projection of curves lying across a surface, particularly from parallel undulating curves. Since the image projection loses 3-D information, the interpretation must be constrained by certain a priori assumptions. A theory of constraint on this problem [Stevens 1981a] proposes three assumptions, namely(More)
Subjective contours, according to one theory, outline surfaces that are apparently interposed between the viewer and background (because of the disruption of background figures, sudden termination of lines, and other interposition 'cues') but are not explicitly outlined by intensity discontinuities. This theory predicts that if the cues are not interpreted(More)
The objective of this study was to determine during rotation the relative importance of a scene in achieving "visual dominance" over non-visual vestibular orientation inputs, e.g., otolith and semicircular canals. Five visual scenes were presented, while rotating the subject (at three angular acceleration rates), to obtain the vestibular and optokinetic(More)
In the work reported in the literature the reduction or decrement in the magnitude of the Müller-Lyer illusion with continued inspection has been typically investigated with the use of the composite illusion form. Three experiments are reported in which the illusion decrement was separately examined in the underestimated (wings-in) and the overestimated(More)
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