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Object representation and predictive action in infancy
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology.
2000 (English)In: Developmental Science, ISSN 1363-755X, E-ISSN 1467-7687, Vol. 3, no 2, 193-205 p.Article in journal (Refereed) Published
Abstract [en]

Previous research has shown that 6-month-old infants extrapolate object motion on linear paths when they act predictively on fully visible moving objects but not when they observe partly occluded moving objects. The present research probed whether differences in the tasks presented to infants or in the visibility of the objects account for these findings, by investigating infants’ predictive head tracking of a visible object that moves behind a small occluder. Six-month-old infants were presented with an object that moved repeatedly on linear or nonlinear paths, with an occluder covering the place where all the paths intersected. The first time infants viewed an object’s motion, their head movements did not anticipate either linear or nonlinear motion, but they quickly learned to anticipate linear motion on successive trials. Infants also learned to anticipate nonlinear motion, but this learning was slower and less consistent. Learning in all cases concerned the trajectory of the object, not the specific locations at which the object appeared. These findings suggest that infants form object representations that are weakly biased toward inertial motion and that are influenced by learning. The findings accord with the thesis that a single system of representation underlies both predictive action and perception of object motion, and that occlusion reduces the precision of object representations.

Place, publisher, year, edition, pages
2000. Vol. 3, no 2, 193-205 p.
National Category
Psychology
Identifiers
URN: urn:nbn:se:uu:diva-36836DOI: 10.1111/1467-7687.00113OAI: oai:DiVA.org:uu-36836DiVA: diva2:64735
Available from: 2008-06-10 Created: 2008-06-10 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Predictive action in infancy: Evidence of early prospective behavior
Open this publication in new window or tab >>Predictive action in infancy: Evidence of early prospective behavior
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

How do young infants understand and act on their constantly changing environment? An action perspective on motor development was taken into account. The present thesis investigated perception guided predictive action in 6-month-old infants, namely, head tracking and reaching for an object moving on a pre-defined trajectory, linear or nonlinear, fully visible or partially occluded. The motion trials were presented in a randomized order or in a way by using an ABBA block design.

Study I of this thesis began with the exploration of the principles underlying infant predictive action. Infants were presented a fully visible moving object on four trajectories: two linear trajectories that intersected at the center of a display and two non-linear trajectories that contained a sudden turn at the point of intersection. The results supplied evidence that both infants’ head tracking and reaching showed an extrapolation of the object’s motion on linear paths, which was described by the principle of inertia. No learning effect was found in spite of repeated fully visible trials. Previous experiments reported that infants of similar age showed a reduction in reaching when object motion was occluded briefly.

Thus Study II was undertaken, in part, to evaluate whether differences in the tasks resented to infants or differences in the visibility of the objects account for these findings. This was done by investigating infants’ predictive head tracking of an object following the procedure presented in Study I with only one exception: object motion was partially occluded by a small occluder positioned on the motion trajectory. Study II also raised a second question concerning infants’ ability to learn to anticipate upcoming object motions. It was found that infants were able to quickly learn to anticipate either linear or nonlinear motion but with a superior learning effect from linear motion. This pattern suggested a tendency to anticipate the upcoming motion in accord with inertia. Although a capacity to anticipate occluded object motion in accord with inertia was present, it was weak, as infants’ initial reaction to the occluded object motion revealed no such tendency. Learning in all cases was associated with the trajectory of the object, not the specific locations at which the object appeared. It was suggested that infants might form object representations that are influenced by learning and that are just weakly biased toward inertia extrapolation. This finding supported the claims that occlusion reduces the presentation of object representation, as suggested by single system of object representation theory.

Place, publisher, year, edition, pages
Umeå: Institutionen för psykologi, Umeå universitet, 2009. 52 p.
Series
Umeå Psychology Supplement Reports, ISSN 1653-7688 ; 13
National Category
Social Sciences Psychology
Research subject
Psychology
Identifiers
urn:nbn:se:umu:diva-20299 (URN)
Distributor:
Institutionen för psykologi, 90187, Umeå
Presentation
Beteendevetarhuset, Bt 102, Umeå universitet, Umeå (English)
Opponent
Supervisors
Available from: 2009-04-15 Created: 2009-03-18 Last updated: 2011-06-07Bibliographically approved

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von Hofsten, Claes

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