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Neural Correlates of Shape from Shading

Research output: Contribution to journalArticle


P Mamassian, Ines Jentzsch, BA Bacon, SR Schweinberger

School/Research organisations


Psychophysical studies have shown that human observers resolve shape-from-shading ambiguities by assuming that light is coming from above-left. Using event-related potentials (ERPs), we measured the processing time of the perception of an ambiguous shaded pattern. We found that the N2 component followed the change of perceived shape with stimulus orientation. We also found that the PI component in occipital and temporal areas was correlated with the observers' idiosyncratic bias for light source position. The precocity of the correlated ERP components suggests that the light source is represented early in the visual system. Altogether, our results indicate that shape-from-shading is a mostly bottom-up mechanism.



Original languageEnglish
Pages (from-to)971-975
Number of pages5
Issue number7
Publication statusPublished - 23 May 2003

    Research areas

  • ambiguous perception, brain potential correlates, depth perception, event-related potentials, monocular vision, prior knowledge, shapefrom-shading, SURFACE-ORIENTATION, PERCEPTION, AREAS

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