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Directional shifts in the barber pole illusion: Effects of spatial frequency, spatial adaptation, and lateral masking

Published online by Cambridge University Press:  04 October 2006

CHRISTOPHE LALANNE
Affiliation:
LENA, CNRS UPR 640, Paris, France
JEAN LORENCEAU
Affiliation:
LENA, CNRS UPR 640, Paris, France

Abstract

We report the results of psychophysical experiments with the so-called barber pole stimulus providing new insights on the neuronal processes underlying the analysis of moving features such as terminators or line-endings. In experiment 1, we show that the perceived direction of a barber pole stimulus, induced by line-ending motion, is highly dependent on the spatial frequency and contrast of the grating stimulus: perceived direction is shifted away from the barber pole illusion at high spatial frequency in a contrast dependent way, suggesting that line-ends are not processed at high spatial scales. In subsequent experiments, we use a contrast adaptation paradigm and a masking paradigm in an attempt to assess the spatial structure and location of the receptive fields that process line-endings. We show that the adapting stimulus that weakens most the barber pole illusion is localized within the barber pole stimulus and not at line-endings' locations. Current models of line-endings' motion processing are discussed in the light of these psychophysical results.

Type
Research Article
Copyright
2006 Cambridge University Press

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