Tracking multiple items through occlusion: clues to visual objecthood

Article Abstract:

Some of the spatiotemporal constraints which the visual system utilizes to recognize enduring visual objecthood are examined. Experiments in which subjects tried to track multiple items as they moved about a display reveal that occlusion is taken into account when computing enduring perceptual objecthood. Impaired performance is related to disappearance and reappearance of items in ways that do not implicate the presence of occluding surfaces. Unimpaired performance is not related to visible occluders, that is, Michotte's tunnel effect.

Cognitive psychology, Space perception

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Perceptual dimensional constraints in response selection processes

Article Abstract:

The assumption that response selection processes are mostly independent from earlier perceptual analysis of information is challenged. It is argued that the interaction between perception and action is much more complex. Five experiments are presented to provide support for this argument and to show that information processing in the perceptual system may influence computations by the response selection system to some extent. The results of the experiments are discussed.

Human information processing, Visual evoked response, Visual evoked potentials

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Volume completion

Article Abstract:

Research was conducted to prove that contour relatability is neither necessary nor sufficient for completion to occur. Thus, an account of completion that is based on the linking of visible contours or surfaces behind an occluder is inadequate. A volume-based account of amodal completion subsumes surface completion as a special case and explains examples that neither a contour- nor a surface-based account has the ability to explain.

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