Tracking Multiple Items Through Occlusion: Clues to Visual Objecthood
David Bourget (Western Ontario)
David Chalmers (ANU, NYU)
Rafael De Clercq
Ezio Di Nucci
Jonathan Jenkins Ichikawa
Jack Alan Reynolds
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In three experiments, subjects attempted to track multiple items as they moved independently and unpredictably about a display. Performance was not impaired when the items were briefly (but completely) occluded at various times during their motion, suggesting that occlusion is taken into account when computing enduring perceptual objecthood. Unimpaired performance required the presence of accretion and deletion cues along fixed contours at the occluding boundaries. Performance was impaired when items were present on the visual field at the same times and to the same degrees as in the occlusion conditions, but disappeared and reappeared in ways which did not implicate the presence of occluding surfaces (e.g. by imploding and exploding into and out of existence, instead of accreting and deleting along a fixed contour). Unimpaired performance did not require visible occluders (i.e. Michotte’s tunnel effect) or globally consistent occluder positions. We discuss implications of these results for theories of objecthood in visual attention.
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Stanislas Dehaene, Elizabeth Spelke & Lisa Feigenson (2004). Core Systems of Number. Trends in Cognitive Sciences 8 (7):307-314.
Fernanda Ferreira, Jens Apel & John M. Henderson (2008). Taking a New Look at Looking at Nothing. Trends in Cognitive Sciences 12 (11):405-410.
F. Xu & E. S. Spelke (2000). Large Number Discrimination in 6-Month-Old Infants. Cognition 74 (1):1-11.
Brian Scholl (2001). Objects and Attention: The State of the Art. Cognition 80 (1-2):1-46.
Zenon W. Pylyshyn (2001). Visual Indexes, Preconceptual Objects, and Situated Vision. Cognition 80 (1-2):127-158.
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