Dynamic binding of identity and location information: a serial model of multiple identity tracking |
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Authors: | Oksama Lauri Hyönä Jukka |
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Institution: | aDepartment of Behavioral Sciences, National Defence College, University of Turku, FIN-20014 Turku, Finland;bDepartment of Psychology, University of Turku, FIN-20014 Turku, Finland |
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Abstract: | Tracking of multiple moving objects is commonly assumed to be carried out by a fixed-capacity parallel mechanism. The present study proposes a serial model (MOMIT) to explain performance accuracy in the maintenance of multiple moving objects with distinct identities. A serial refresh mechanism is postulated, which makes recourse to continuous attention switching, a capacity-limited episodic buffer for identity-location bindings, indexed location information stored in the visuospatial short-term memory, and an active role of long-term memory. As identity-location bindings are refreshed serially, a location error is inherent for all other targets except the focally attended one. The magnitude of this location error is a key factor in predicting tracking accuracy. MOMIT’s predictions were supported by the data of five experiments: performance accuracy decreased as a function of target set-size, speed, and familiarity. A mathematical version of MOMIT fitted nicely to the observed data with plausible parameter estimates for the binding capacity and refresh time. |
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Keywords: | Multiple identity tracking Dynamic visual scenes Identity-location binding Episodic buffer Visuospatial short-term memory Long-term memory Change detection Multiple object tracking |
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