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Infants' Evolving Representations of Object Motion During Occlusion: A Longitudinal Study of 6- to 12-Month-Old Infants
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology.
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology.
2004 (English)In: Infancy, ISSN 1525-0008, E-ISSN 1532-7078, Vol. 6, no 2, 165-184 p.Article in journal (Refereed) Published
Abstract [en]

Infants' ability to track temporarily occluded objects that moved on circular trajectories was investigated in 20 infants using a longitudinal design. They were first seen at 6 months and then every 2nd month until the end of their 1st year. Infants were presented with occlusion events covering 20% of the target's trajectory (effective occlusion interval ranged from 500–4,000 msec). Gaze was measured using an ASL 504 infrared eye-tracking system. Results effectively demonstrate that infants from 6 months of age can represent the spatiotemporal dynamics of occluded objects. Infants at all ages tested were able to predict, under certain conditions, when and where the object would reappear after occlusion. They moved gaze accurately to the position where the object was going to reappear and scaled their timing to the current occlusion duration. The average rate of predictive gaze crossings increased with occlusion duration. These results are discussed as a 2-factor process. Successful predictions are dependent on strong representations, themselves dependent on the richness of information available during encoding and graded representations.

Place, publisher, year, edition, pages
2004. Vol. 6, no 2, 165-184 p.
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:uu:diva-91469DOI: 10.1207/s15327078in0602_2OAI: oai:DiVA.org:uu-91469DiVA: diva2:164207
Available from: 2004-03-12 Created: 2004-03-12 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Infants’ Knowledge of Occluded Objects: Evidence of Early Spatiotemporal Representations
Open this publication in new window or tab >>Infants’ Knowledge of Occluded Objects: Evidence of Early Spatiotemporal Representations
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis demonstrates that infants represent temporarily non-visible, or occluded, objects. From 4 months of age, infants could accurately predict the reappearance of a moving object after 660 ms of non visibility; indicating accurate spatiotemporal representations. At this age predictions were dominated by associations between specific events and outcomes (associative rules). Between 6 and 8 months of age predictions became dominated by extrapolations (Study III). From 6 months infants could represent occluded objects for up to 4 seconds. The number of successful predictions decreased, however, if the information contained in the occlusion event diminished (time of accretion and deletion). As infants grew older (up to 12 months) they produced more accurate predictions. (Study II). The similarities between adult and infant performances were numerous (Study I). These conclusion are based on one cross sectional (Study I) and two longitudinal studies (Study II & III) in which an object, a ‘happy face’, moved on circular (Study I, II, & III) and other complex trajectories (Study III). One portion of each trajectory was covered by a screen that blocked the object from sight. In each study participants gaze were recorded with an infrared eye tracking system (ASL 504) and a magnetic head tracker (Flock of Birds). This data was combined with data from the stimulus and stored for of line analysis.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2004. 64 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Social Sciences, ISSN 0282-7492 ; 134
Keyword
Psychology, infants, occlusion, gaze, object representations, temporal, spatial, associative rule, extrapolation, Psykologi
National Category
Psychology
Identifiers
urn:nbn:se:uu:diva-4058 (URN)91-554-5898-X (ISBN)
Public defence
2004-04-14, Sal X, Universitetshuset, Uppsala, 10:15
Opponent
Supervisors
Available from: 2004-03-12 Created: 2004-03-12Bibliographically approved

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Gredebäck, Gustafvon Hofsten, Claes

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