September 2019
Volume 19, Issue 10
Open Access
Vision Sciences Society Annual Meeting Abstract  |   September 2019
How do temporal mechanisms influence numerosity perception?
Author Affiliations & Notes
  • Andromachi Tsouli
    Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht, The Netherlands
  • Maarten J van der Smagt
    Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht, The Netherlands
  • Serge O Dumoulin
    Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht, The Netherlands
    Spinoza Centre for Neuroimaging, Amsterdam, The Netherlands
    Experimental and Applied Psychology, VU University, Amsterdam, The Netherlands
  • Susan F te Pas
    Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht, The Netherlands
Journal of Vision September 2019, Vol.19, 211b. doi:10.1167/19.10.211b
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      Andromachi Tsouli, Maarten J van der Smagt, Serge O Dumoulin, Susan F te Pas; How do temporal mechanisms influence numerosity perception?. Journal of Vision 2019;19(10):211b. doi: 10.1167/19.10.211b.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

We have previously shown that adaptation to visual duration affects numerosity perception, which supports the theory of a common magnitude system underlying numerical and temporal processing. We performed two follow-up experiments to elucidate the nature of the interaction between numerosity and duration. The first experiment tested the effect of adaptation to visual duration on numerosity discrimination, whereas the second experiment tested the combined effect of adaptation to visual duration and numerosity on numerosity discrimination. In both experiments, we manipulated the onset/offset duration of the adapter, the adapter’s total presentation time and the total duration of the adaptation trial. We hypothesized that if the effect of duration on numerosity is driven by adapting duration ‘channels’ tuned to specific durations, then what matters is the onset-offset duration of the adapter, whereas if duration reflects the ‘strength’ of adaptation, then what matters is the total duration of the adaptation trial. We found that the effect of adaptation to duration on numerosity perception is driven by adapting specific duration channels. In contrast, the effect of adaptation to numerosity on numerosity perception is driven by the total duration of the adaptation trial, in accordance with the strength of adaptation hypothesis. We propose that different temporal mechanisms affect numerosity perception.

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