Representing multiple object weights: competing priors and sensorimotor memories

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Baugh, Lee A. (author)

Representing multiple object weights : competing priors and sensorimotor memories

Article/chapterEnglish2016

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American Physiological Society,2016
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LIBRIS-ID:oai:DiVA.org:umu-128472
https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-128472URI
https://doi.org/10.1152/jn.00282.2016DOI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype

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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.

Subject headings and genre

MEDICIN OCH HÄLSOVETENSKAP Klinisk medicin Neurologi hsv//swe
MEDICAL AND HEALTH SCIENCES Clinical Medicine Neurology hsv//eng
object lifting
sensorimotor integration
sensorimotor memory
weight prediction

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Yak, Amelie (author)
Johansson, Roland S.Umeå universitet,Institutionen för integrativ medicinsk biologi (IMB)(Swepub:umu)rojo0004 (author)
Flanagan, J. Randall (author)
Umeå universitetInstitutionen för integrativ medicinsk biologi (IMB) (creator_code:org_t)

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In:Journal of Neurophysiology: American Physiological Society116:4, s. 1615-16250022-30771522-1598

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MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Clinical Medicin ...; and Neurology

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By the university: Umeå University

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