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Experience can chan...
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Flanagan, J Randall
(författare)
Experience can change distinct size-weight priors engaged in lifting objects and judging their weights.
- Artikel/kapitelEngelska2008
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Elsevier BV,2008
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LIBRIS-ID:oai:DiVA.org:umu-19418
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https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-19418URI
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https://doi.org/10.1016/j.cub.2008.09.042DOI
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Språk:engelska
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Sammanfattning på:engelska
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The expectation that object weight increases with size guides the control of manipulatory actions [1-6] and also influences weight perception. Thus, the size-weight illusion, whereby people perceive the smaller of two equally weighted objects to be heavier, is thought to arise because weight is judged relative to expected weight that, for a given family of objects, increases with size [2, 7]. Here, we show that the fundamental expectation that weight increases with size can be altered by experience and neither is hard-wired nor becomes crystallized during development. We demonstrate that multiday practice in lifting a set of blocks whose color and texture are the same and whose weights vary inversely with volume gradually attenuates and ultimately inverts the size-weight illusion tested with similar blocks. We also show that in contrast to this gradual change in the size-weight illusion, the sensorimotor system rapidly learns to predict the inverted object weights, as revealed by lift forces. Thus, our results indicate that distinct adaptive size-weight maps, or priors, underlie weight predictions made in lifting objects and in judging their weights. We suggest that size-weight priors that influence weight perception change slowly because they are based on entire families of objects. Size-weight priors supporting action are more flexible, and adapt more rapidly, because they are tuned to specific objects and their current state.
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Bittner, Jennifer P
(författare)
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Johansson, Roland SUmeå universitet,Fysiologi(Swepub:umu)rojo0004
(författare)
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Umeå universitetFysiologi
(creator_code:org_t)
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Ingår i:Current Biology: Elsevier BV18:22, s. 1742-70960-98221879-0445
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