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Two-step actions in infancy—the TWAIN model
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology. (Uppsala Child and Baby Lab)ORCID iD: 0000-0001-5497-4001
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology.ORCID iD: 0000-0003-3046-0043
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology.ORCID iD: 0000-0003-1326-6177
2019 (English)In: Experimental Brain Research, ISSN 0014-4819, E-ISSN 1432-1106Article in journal (Refereed) Published
Abstract [en]

In this paper, we propose a novel model—the TWAIN model—to describe the durations of two-step actions in a reach-to-place task in human infants. Previous research demonstrates that infants and adults plan their actions across multiple steps. They adjust, for instance, the velocity of a reaching action depending on what they intend to do with the object once it is grasped. Despite these findings and irrespective of the larger context in which the action occurs, current models (e.g., Fitts’ law) target single, isolated actions, as, for example, pointing to a goal. In the current paper, we develop and empirically test a more ecologically valid model of two-step action planning. More specifically, 61 18-month olds took part in a reach-to-place task and their reaching and placing durations were measured with a motion-capture system. Our model explained the highest amount of variance in placing duration and outperformed six previously suggested models, when using model comparison. We show that including parameters of the first action step, here the duration of the reaching action, can improve the description of the second action step, here the duration of the placing action. This move towards more ecologically valid models of action planning contributes knowledge as well as a framework for assessing human machine interactions. The TWAIN model provides an updated way to quantify motor learning by the time these abilities develop, which might help to assess performance in typically developing human children.

Place, publisher, year, edition, pages
2019.
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Social Sciences Psychology
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URN: urn:nbn:se:uu:diva-390180DOI: 10.1007/s00221-019-05604-0OAI: oai:DiVA.org:uu-390180DiVA, id: diva2:1340901
Funder
EU, European Research Council, ERC-StG CACTUS 312292Swedish Research Council, VR-PG 2017-01504Available from: 2019-08-06 Created: 2019-08-06 Last updated: 2019-08-06

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Gottwald, JannaGredebäck, GustafLindskog, Marcus

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