David Bourget (Western Ontario)
David Chalmers (ANU, NYU)
Rafael De Clercq
Jack Alan Reynolds
Learn more about PhilPapers
Cognition 80 (1-2):159-177 (2001)
The notion that visual attention can operate over visual objects in addition to spatial locations has recently received much empirical support, but there has been relatively little empirical consideration of what can count as an `object' in the ®rst place. We have investi- gated this question in the context of the multiple object tracking paradigm, in which subjects must track a number of independently and unpredictably moving identical items in a ®eld of identical distractors. What types of feature clusters can be tracked in this manner? In other words, what counts as an `object' in this task? We investigated this question with a technique we call target merging: we alter tracking displays so that distinct target and distractor loca- tions appear perceptually to be parts of the same object by merging pairs of items (one target with one distractor) in various ways ± for example, by connecting item locations with a simple line segment, by drawing the convex hull of the two items, and so forth. The data show that target merging makes the tracking task far more dif®cult to varying degrees depending on exactly how the items are merged. The effect is perceptually salient, involving in some conditions a total destruction of subjects' capacity to track multiple items. These studies provide strong evidence for the object-based nature of tracking, con®rming that in some contexts attention must be allocated to objects rather than arbitrary collections of features. In addition, the results begin to reveal the types of spatially organized scene components that can be independently attended as a function of properties such as connectedness, part struc- ture, and other types of perceptual grouping. q 2001 Elsevier Science B.V. All rights reserved
|Keywords||No keywords specified (fix it)|
|Categories||categorize this paper)|
Setup an account with your affiliations in order to access resources via your University's proxy server
Configure custom proxy (use this if your affiliation does not provide a proxy)
|Through your library|
References found in this work BETA
No references found.
Citations of this work BETA
No citations found.
Similar books and articles
Zenon W. Pylyshyn (2001). Visual Indexes, Preconceptual Objects, and Situated Vision. Cognition 80 (1-2):127-158.
Brian J. Scholl & Zenon W. Pylyshyn, Tracking Multiple Items Through Occlusion: Clues to Visual Objecthood.
Zenon W. Pylyshyn, Charles E. King & James E. Reilly, Selective Nontarget Inhibition in Multiple Object Tracking (MOT).
Zenon Pylyshyn, Some Puzzling Findings in Multiple Object Tracking (MOT): II. Inhibition of Moving Nontargets.
Zenon Pylyshyn, Some Puzzling Findings in Multiple Object Tracking: I. Tracking Without Keeping Track of Object Identities.
Glyn W. Humphreys & M. Jane Riddoch (2007). How to Define an Object: Evidence From the Effects of Action on Perception and Attention. Mind and Language 22 (5):534–547.
Brian J. Scholla (2001). What is a Visual Object? Evidence From Target Merging in Multiple Object Tracking. Cognition 80 (1-2):159-177.
Added to index2009-01-28
Total downloads19 ( #95,967 of 1,139,970 )
Recent downloads (6 months)1 ( #157,515 of 1,139,970 )
How can I increase my downloads?