Mass Is All That Matters in the Size–Weight Illusion
Identifieur interne : 002214 ( Pmc/Corpus ); précédent : 002213; suivant : 002215Mass Is All That Matters in the Size–Weight Illusion
Auteurs : Myrthe A. Plaisier ; Jeroen B. J. SmeetsSource :
- PLoS ONE [ 1932-6203 ] ; 2012.
Abstract
An object in outer space is weightless due to the absence of gravity, but astronauts can still judge whether one object is heavier than another one by accelerating the object. How heavy an object feels depends on the exploration mode: an object is perceived as heavier when holding it against the pull of gravity than when accelerating it. At the same time, perceiving an object’s size influences the percept: small objects feel heavier than large objects with the same mass (size–weight illusion). Does this effect depend on perception of the pull of gravity? To answer this question, objects were suspended from a long wire and participants were asked to push an object and rate its heaviness. This way the contribution of gravitational forces on the percept was minimised. Our results show that weight is not at all necessary for the illusion because the size–weight illusion occurred without perception of weight. The magnitude of the illusion was independent of whether inertial or gravitational forces were perceived. We conclude that the size–weight illusion does not depend on prior knowledge about
Url:
DOI: 10.1371/journal.pone.0042518
PubMed: 22912704
PubMed Central: 3415412
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