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Size aftereffect is non-local

Ecem Altan, Huseyin Boyaci
doi: https://doi.org/10.1101/2020.03.19.998161
Ecem Altan
aA.S. Brain Research Center & National Magnetic Resonance Research Center (UMRAM), Bilkent University, Ankara, Turkey
bSchool of Optometry and Vision Science, The University of Auckland, Auckland, New Zealand
cDepartment of Psychology, Bilkent University, Ankara, Turkey
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  • For correspondence: altan.ecem@hotmail.com
Huseyin Boyaci
aA.S. Brain Research Center & National Magnetic Resonance Research Center (UMRAM), Bilkent University, Ankara, Turkey
cDepartment of Psychology, Bilkent University, Ankara, Turkey
dDepartment of Psychology, JL Gießen University, Gießen, Germany
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Abstract

It is well known that prolonged exposure to a certain size stimulus alters the perceived size of a subsequently presented stimulus at the same location. How the rest of the visual space is affected by this size adaptation, however, has not been systematically studied before. Here, to fill this gap in literature, we tested size adaptation at the adapter location as well as the rest of the visual space. We used peripherally presented solid discs (Experiment 1) and rings (Experiment 2) as adapter and target (test) stimuli. Observers adapted to a mid-sized stimulus and judged the size of the subsequently presented smaller or larger target stimuli. Results showed that the perceived sizes of target stimuli were repelled away from the adapter size, not only at the adapter location but also at distant locations. These findings demonstrate that size adaptation causes widespread distortion of the visual space and alters perceived size. We discuss possible computational models that may underpin the perceptual effect.

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Posted March 20, 2020.
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Size aftereffect is non-local
Ecem Altan, Huseyin Boyaci
bioRxiv 2020.03.19.998161; doi: https://doi.org/10.1101/2020.03.19.998161
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Size aftereffect is non-local
Ecem Altan, Huseyin Boyaci
bioRxiv 2020.03.19.998161; doi: https://doi.org/10.1101/2020.03.19.998161

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