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Representing multiple object weights: competing priors and sensorimotor memories
Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB).
2016 (English)In: Journal of Neurophysiology, ISSN 0022-3077, E-ISSN 1522-1598, Vol. 116, no 4, 1615-1625 p.Article in journal (Refereed) Published
Abstract [en]

When lifting an object, individuals scale lifting forces based on long-term priors relating external object properties (such as material and size) to object weight. When experiencing objects that are poorly predicted by priors, people rapidly form and update sensorimotor memories that can be used to predict an object's atypical size-weight relation in support of predictively scaling lift forces. With extensive experience in lifting such objects, long-term priors, assessed with weight judgments, are gradually updated. The aim of the present study was to understand the formation and updating of these memory processes. Participants lifted, over multiple days, a set of black cubes with a normal size-weight mapping and green cubes with an inverse size-weight mapping. Sensorimotor memory was assessed with lifting forces, and priors associated with the black and green cubes were assessed with the size-weight illusion (SWI). Interference was observed in terms of adaptation of the SWI, indicating that priors were not independently adjusted. Half of the participants rapidly learned to scale lift forces appropriately, whereas reduced learning was observed in the others, suggesting that individual differences may be affecting sensorimotor memory abilities. A follow-up experiment showed that lifting forces are not accurately scaled to objects when concurrently performing a visuomotor association task, suggesting that sensorimotor memory formation involves cognitive resources to instantiate the mapping between object identity and weight, potentially explaining the results of experiment 1. These results provide novel insight into the formation and updating of sensorimotor memories and provide support for the independent adjustment of sensorimotor memory and priors.

Place, publisher, year, edition, pages
2016. Vol. 116, no 4, 1615-1625 p.
Keyword [en]
object lifting, sensorimotor integration, sensorimotor memory, weight prediction
National Category
Neurology
Identifiers
URN: urn:nbn:se:umu:diva-128472DOI: 10.1152/jn.00282.2016ISI: 000386828400009PubMedID: 27385795OAI: oai:DiVA.org:umu-128472DiVA: diva2:1056636
Available from: 2016-12-15 Created: 2016-12-05 Last updated: 2016-12-15Bibliographically approved

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Johansson, Roland S.
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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf