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Investigating the Status of Biological Stimuli as Objects of Attention in Multiple Object Tracking

de-Wit, LH; Lefevre, CE; Kentridge, RW; Rees, G; Saygin, AP; (2011) Investigating the Status of Biological Stimuli as Objects of Attention in Multiple Object Tracking. PLOS ONE , 6 (3) , Article e16232. 10.1371/journal.pone.0016232. Green open access

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Abstract

Background: Humans are able to track multiple simultaneously moving objects. A number of factors have been identified that can influence the ease with which objects can be attended and tracked. Here, we explored the possibility that object tracking abilities may be specialized for tracking biological targets such as people.Methodology/Principal Findings: We used the Multiple Object Tracking (MOT) paradigm to explore whether the high-level biological status of the targets affects the efficiency of attentional selection and tracking. In Experiment 1, we assessed the tracking of point-light biological motion figures. As controls, we used either the same stimuli or point-light letters, presented in upright, inverted or scrambled configurations. While scrambling significantly affected performance for both letters and point-light figures, there was an effect of inversion restricted to biological motion, inverted figures being harder to track. In Experiment 2, we found that tracking performance was equivalent for natural point-light walkers and 'moon-walkers', whose implied direction was incongruent with their actual direction of motion. In Experiment 3, we found higher tracking accuracy for inverted faces compared with upright faces. Thus, there was a double dissociation between inversion effects for biological motion and faces, with no inversion effect for our non-biological stimuli (letters, houses).Conclusions/Significance: MOT is sensitive to some, but not all naturalistic aspects of biological stimuli. There does not appear to be a highly specialized role for tracking people. However, MOT appears constrained by principles of object segmentation and grouping, where effectively grouped, coherent objects, but not necessarily biological objects, are tracked most successfully.

Type: Article
Title: Investigating the Status of Biological Stimuli as Objects of Attention in Multiple Object Tracking
Open access status: An open access version is available from UCL Discovery
DOI: 10.1371/journal.pone.0016232
Publisher version: http://dx.doi.org/10.1371/journal.pone.0016232
Language: English
Additional information: © 2011 de-Wit et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This work was supported by an Experimental Psychology Society study visit grant (LHD), an Economic and Social Research Council 1+3 studentship (LHD), a European Commission Marie-Curie Fellowship (APS), the Wellcome Trust (GR) and a Methusalem grant (METH/08/02) from the Flemish government. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
Keywords: MOTION PERCEPTION, VISUAL-ATTENTION, NEURAL MECHANISMS, FACE-INVERSION, PARIETAL, CORTEX, ORIENTATION, VISION, SHAPE
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences > Clinical, Edu and Hlth Psychology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1305343
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