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Preparation for grasping an object: A developmental study.
¨Psykologiska institutionen, Uppsala universitet.
Umeå University, Faculty of Social Sciences, Department of Psychology.
1988 (English)In: Journal of Experimental Psychology: Human Perception and Performance, ISSN 0096-1523, E-ISSN 1939-1277, Vol. 14, no 4, 610-621 p.Article in journal (Refereed) Published
Abstract [en]

An optoelectronic technique (SELSPOT) was used to monitor the opening and closing of the hand during reaching actions by measuring the change in the distance between thumb and index finger. Exp 1 established an adult criterion for the development. Adults started closing the hand around the target well before touch, and the timing was dependent on the size of the target. The hand started to close earlier when grasping a small rather than a large target. In addition, the degree of hand opening was also less for a small than for a large target. In Exp 2, infants who were 5–6, 9, and 13 months of age also controlled their grasping actions visually and started closing the hand around the target in anticipation of the encounter rather than as a reaction to the encounter. The strategy of the two younger age groups was different from that of adults. They started closing the hand closer to the time of contact with the target than did the 13-month-olds, who were comparable to adults in this respect. In all age groups, reaching and grasping were most commonly organized in a continuous way; the hand started to close without any interruption in the approach. The opening of the hand was adjusted to target size in the 9- and 13-month-olds but not in the 5–6 month olds.

Place, publisher, year, edition, pages
1988. Vol. 14, no 4, 610-621 p.
National Category
Social Sciences
Research subject
Psychology
Identifiers
URN: urn:nbn:se:umu:diva-63091OAI: oai:DiVA.org:umu-63091DiVA: diva2:581399
Available from: 2013-01-01 Created: 2013-01-01 Last updated: 2017-12-06
In thesis
1. Arm and hand movements in neonates and young infants
Open this publication in new window or tab >>Arm and hand movements in neonates and young infants
1993 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Umeå: Umeå University, 1993. 42 p.
National Category
Psychology
Research subject
Psychology
Identifiers
urn:nbn:se:umu:diva-63364 (URN)91-7174-839-3 (ISBN)
Public defence
1993-12-04, Department of Psychology, Lecture room Bt 102, Umeå University, Umeå, 10:15
Note

retroaktiv registrering

Available from: 2013-02-06 Created: 2013-01-02 Last updated: 2013-02-06Bibliographically approved

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