The concept of an "object" in perception and cognition / Robert Schwartz -- Balls of wax and cans of worms : the early history of object perception / Margaret Atherton -- Perceptual unit formation in infancy / Martha E. Arterberry -- Perceptual units and their mapping with language / Barbara Landau -- An object substitution theory of visual masking / James T. Enns and Vincent Di Lollo -- Attention and unit formation : a biased competition account of object-based attention / Shaun P. Vecera and Marlene Behrmann -- Geometric and neural models of object perception / Philip J. Kellman, Sharon E. Guttman, and Thomas D. Wickens -- Varieties of grouping and its role in determining surface layout / Barbara Gillam -- Amodal completion : a case study in grouping / Allison B. Sekuler and Richard F. Murray -- Perceptual organization as generic object recognition / David W. Jacobs -- Simplicity, regularity, and perceptual interpretations : a structural information approach / Rob Van Lier -- Computational neural models of spatial integration in perceptual grouping / Heiko Neumann and Ennio Mingolla -- Part-based representations of visual shape and implications for visual cognition / Manish Singh and Donald D. Hoffman -- Gaze control for face learning and recognition by humans and machines / John Henderson [and others] -- The visual interpretation of object and human movement / Maggie Shiffrar -- Contours from apparent motion : a computational theory / William Prophet, Donald Hoffman, and Carol Cicerone -- Breathing illusions and boundary formation in space-time / Nicola Bruno -- Perception of occluding and occluded objects over time : spatiotemporal segmentation and unit formation / Thomas F. Shipley and Douglas W. Cunningham.