May 2008
Volume 8, Issue 6
Free
Vision Sciences Society Annual Meeting Abstract  |   May 2008
Visual processing oscillation fossils
Author Affiliations
  • Caroline Blais
    Centre de Recherche en Neuropsychologie et en Cognition, Université de Montréal
  • Martin Arguin
    Centre de Recherche en Neuropsychologie et en Cognition, Université de Montréal
  • Frédéric Gosselin
    Centre de Recherche en Neuropsychologie et en Cognition, Université de Montréal
Journal of Vision May 2008, Vol.8, 369. doi:10.1167/8.6.369
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      Caroline Blais, Martin Arguin, Frédéric Gosselin; Visual processing oscillation fossils. Journal of Vision 2008;8(6):369. doi: 10.1167/8.6.369.

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

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Abstract

When we look at the world surrounding us, we experience a continuous flow of information coming to our eyes. The most intuitive interpretation of this experience of continuity is that the visual system processes information in a continuous manner. In striking contrast with this intuition, a growing body of evidence suggests that we apprehend the world via discrete processing epochs (VanRullen, Reddy & Koch, 2005; 2006; Ward, 2003). However, the exact nature of these oscillations has been derived indirectly via modelization. Here, we investigated the nature of these oscillations using a classification image approach. We asked five subjects to determine if a stimulus, presented during 200 ms, was a face or a house. On every trial, the signal was either a house or a face that dissolved sinusoïdally into a white Gaussian noise field (phase relative to stimulus onset: 0, pi/6, pi/3, pi/2, 2*pi/3, and 5*pi/6; frequencies: 5, 10, 15, and 20 Hz). Performance was maintained at 75% correct by adjusting signal-to-noise ratio with QUEST (Watson & Pelli, 1983). We found a modulation of the performance as a function of the frequency and the phase relative to stimulus onset (peak-to-trough differences ranging from 11.9% and 18.7%, and from 5.9% and 19.0% for the frequency and the phase respectively), further supporting the hypothesis of discrete processing epochs. We have reconstructed the optimal stimulus in the least-mean-square sense for every participant by performing multiple regressions on the stimuli oscillations and performance. We typically found two oscillations in the classification images: one at 5 Hz and the other between 15 and 20 Hz. We believe that we have revealed fossilized oscillations at different stages of visual processing; the fastest oscillation could be the elusive “perceptual moments” and slower ones could be attention-related oscillations (see also VanRullen, Carlson, & Cavanagh, 2007).

Blais, C. Arguin, M. Gosselin, F. (2008). Visual processing oscillation fossils [Abstract]. Journal of Vision, 8(6):369, 369a, http://journalofvision.org/8/6/369/, doi:10.1167/8.6.369. [CrossRef]
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