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Tytuł pozycji:

Representing multiple object weights: competing priors and sensorimotor memories.

Tytuł :
Representing multiple object weights: competing priors and sensorimotor memories.
Autorzy :
Baugh LA; Centre for Neuroscience Studies, Queen's University, Kingston, Ontario, Canada.
Yak A; Centre for Neuroscience Studies, Queen's University, Kingston, Ontario, Canada.
Johansson RS; Physiology Section, Department of Integrative Medical Biology, Umeå University, Umeå, Sweden; and.
Flanagan JR; Centre for Neuroscience Studies, Queen's University, Kingston, Ontario, Canada; Department of Psychology, Queen's University, Kingston, Ontario, Canada .
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Źródło :
Journal of neurophysiology [J Neurophysiol] 2016 Oct 01; Vol. 116 (4), pp. 1615-1625. Date of Electronic Publication: 2016 Jul 06.
Typ publikacji :
Journal Article; Research Support, Non-U.S. Gov't
Język :
Imprint Name(s) :
Publication: Bethesda Md : American Physiological Society
Original Publication: Washington [etc.]
MeSH Terms :
Motor Activity*
Weight Perception*
Analysis of Variance ; Female ; Humans ; Male ; Psychological Tests ; Young Adult
References :
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Grant Information :
International Canadian Institutes of Health Research
Contributed Indexing :
Keywords: object lifting*; sensorimotor integration*; sensorimotor memory*; weight prediction*
Entry Date(s) :
Date Created: 20160708 Date Completed: 20170905 Latest Revision: 20181113
Update Code :
PubMed Central ID :
Czasopismo naukowe
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.
(Copyright © 2016 the American Physiological Society.)

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