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Exploring Amodal Completion: Perception and Recognition of Shape in Occlusion

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This research, led by Walter Gerbino at the University of Trieste, examines the phenomena of recognition and perception of shapes despite missing optic information due to occlusion. Key findings reveal that identity perception in shapes remains robust through amodal completion, allowing perceived shapes to maintain their identity even when partially obscured. The study emphasizes the paradox of "less is more," highlighting how occlusion impacts perceived rounding and 3D curvature. The interplay between local and global completion factors is crucial for understanding visual effects and perceptual preferences.

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Exploring Amodal Completion: Perception and Recognition of Shape in Occlusion

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  1. BEHIND SEEING Walter Gerbino Department of Life Sciences - Psychology Unit Gaetano Kanizsa and B.R.A.I.N. Center for Neuroscience, University of Trieste

  2. recognition despite occlusion • optic information isoftenmissing • recognitionisnormallyunaffected

  3. identity

  4. perception is robust • perceivedshapestend to keeptheiridentitythanks to amodalcompletion

  5. however… • a new shape can emerge • paradoxically, less is more

  6. perceived rounding of amodal angles

  7. amodalrounding • the amount of occlusionaffects the amount of perceivedrounding

  8. the eccentricsquare

  9. an instantaneous compromise betweenlocalcompletionfactors time

  10. regularity

  11. regular hexagon

  12. regular hexagon

  13. distorted hexagon

  14. distortion by good continuation • local extrapolations along straight trajectories disrupt global regularity

  15. same pieces different shapes

  16. completioncost

  17. short modalcontours short amodalcontours long amodalcontours long modalcontours

  18. perceived 3D curvature thin frame in front (explicit information) thin frame behind (perceptual preference)

  19. perceived 3D curvature

  20. amodal completion affects modal parts

  21. perceived amount of black • less black in a(constant width frame) than b (superposed squares)

  22. TedAdelson Paolo Bozzi Walter Gerbino Gaetano Kanizsa Jean Lorenceau JoshMcDermott Guido Petter Maggie Shiffrar Yair Weiss visual effectsby

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