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Pictorial depth cues: A new slant.

Five experiments measured the accuracy of human perception of surface slant from pictorial depth cues (PDCs). Perceived slant was calculated from judgments of the relative lengths of a pair of orthogonal lines embedded in the surface. Slant judgments were accurate to within 3 deg . This level of accuracy was achieved whether the PDCs were luminance differences or equiluminous color differences. No evidence was found of the recession to the frontal plane that has been reported by J. J. Gibson (1950) and others. However, evidence was found suggesting that Ss do not make accurate depth estimates of disconnected surfaces. Findings support a model of perception that involves at least 2 and possibly more representations of space: 1 local veridical representation of surface orientation derived primarily from PDCs and another global representation of observer-centered distance derived primarily from binocular disparity and motion parallax. (PsycINFO Database Record (c) 2007 APA, all rights reserved)



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