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Temporal asymmetry and “magnet effect” in similarity and discrimination of prototypical and nonprototypical stimuli: Consequences of differential sensation weighting
Stockholm University, Faculty of Social Sciences, Department of Psychology.
2007 (English)In: Fechner Day 2007: Proceedings of the 23rd Annual Meeting of the International Society for Psychophysics, 2007, 283-288 p.Conference paper (Other academic)
Abstract [en]

The judged similarity between two successive stimuli is higher when the less prototypical stimulus is the first in the pair than when it is the last. Also, the rated similarity between a scalar and a nonscalar melody is greater when the nonscalar melody comes first rather than last in the pair, and a change from a mistuned to a tuned musical interval is harder to detect than when the order is reversed. Such time-order asymmetries can be accounted for by a generalization of Hellström’s sensation-weighting model, with a lower weight for the first stimulus as is usual when two successive stimuli are compared. This would result in assimi-lation of a first-presented nonprototypical stimulus toward the prototype, increasing its similarity to a more prototypical last-presented stimulus. Also, fewer “different” judgments, but not worse discrimination from variants, occur for prototypical than for nonprototypical stimuli; the so-called perceptual magnet effect appears to be a methodology-based artifact.

Place, publisher, year, edition, pages
2007. 283-288 p.
Keyword [en]
magnet effect, differential sensation weighting
National Category
URN: urn:nbn:se:su:diva-11153OAI: diva2:177672
Available from: 2008-01-10 Created: 2008-01-10Bibliographically approved

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Hellström, Åke
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