August 2016
Volume 16, Issue 12
Open Access
Vision Sciences Society Annual Meeting Abstract  |   September 2016
The temporal frequency tuning of CFS: peak suppression at low frequencies
Author Affiliations
  • Shui'Er Han
    School of Psychology, Brennan MacCallum Building, University of Sydney 2006, New South Wales, Australia
  • Claudia Lunghi
    Department of Translational Research on New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
  • David Alais
    School of Psychology, Brennan MacCallum Building, University of Sydney 2006, New South Wales, Australia
Journal of Vision September 2016, Vol.16, 1217. doi:10.1167/16.12.1217
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      Shui'Er Han, Claudia Lunghi, David Alais; The temporal frequency tuning of CFS: peak suppression at low frequencies . Journal of Vision 2016;16(12):1217. doi: 10.1167/16.12.1217.

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      © 2017 Association for Research in Vision and Ophthalmology.

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Abstract

Continuous flash suppression (CFS) is a psychophysical technique where a rapidly changing Mondrian pattern viewed in one eye suppresses the target in the other eye for several seconds. Despite its widespread use in the study of awareness and unconscious processing, the temporal tuning of CFS remains surprisingly unknown. Previous studies have examined the effect of varying the Mondrian refresh rate, but this is not equivalent to manipulating temporal frequency in a pattern that varies randomly in luminance from frame to frame. In this study, we map the temporal frequency tuning of CFS using temporally narrow, bandpass-filtered noise maskers. Our results show that, contrary to common assumption, slower masker refresh rates (e.g., 0.75-1.5 Hz) supress targets for longer durations compared to faster masker refresh rates (e.g., 10 Hz and above). These results seem to reflect a parvocellular bias in CFS, since the low temporal frequency trend was more pronounced with high spatial frequency targets compared to low spatial frequency targets. In addition, raising masker contrast was found to increase suppression duration, but only if the masker modulated at a low temporal frequency (i.e., 2 Hz).

Meeting abstract presented at VSS 2016

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