August 2009
Volume 9, Issue 8
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2009
Illuminating awareness: Investigating the temporal and spatial neural dynamics of metacontrast masking using the event-related optical signal
Author Affiliations
  • Kyle Mathewson
    Beckman Institute, University of Illinois at Urbana-Champaign
  • Diane Beck
    Beckman Institute, University of Illinois at Urbana-Champaign
  • Tony Ro
    Department of Psychology, The City College of the City University of New York
  • Monica Fabiani
    Beckman Institute, University of Illinois at Urbana-Champaign
  • Gabriele Gratton
    Beckman Institute, University of Illinois at Urbana-Champaign
Journal of Vision August 2009, Vol.9, 765. doi:10.1167/9.8.765
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      Kyle Mathewson, Diane Beck, Tony Ro, Monica Fabiani, Gabriele Gratton; Illuminating awareness: Investigating the temporal and spatial neural dynamics of metacontrast masking using the event-related optical signal. Journal of Vision 2009;9(8):765. doi: 10.1167/9.8.765.

      Download citation file:


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

      ×
  • Supplements
Abstract

It has been proposed that in order for a stimulus to reach consciousness, visual information that is relayed to higher brain areas must also be fed back to the early visual areas for a reverberatory strengthening of the representation. This theory further proposes that when these feedback signals from higher brain areas encounter new activity elicited by a different stimulus, this reactivation, and thus the conscious perception of the original target, is inhibited. The present study measured the neural correlates of conscious perception in a backwards metacontrast masking paradigm, in which the detection of a target is inhibited by a subsequent mask. After a fixation cue in the current experiment, target and mask pairs were presented at a constant SOA such that participants detected roughly half of the targets. Using the event related optical signal (EROS), a brain imaging technique with high spatial and temporal resolution, we examined not only the differential activity elicited by detected and undetected targets, but also preparatory activity prior to the target onset that might predict subsequent target detection. Preliminary analyses revealed a parietal area more active before detected targets, preceding an observed reduction in parietal alpha power measured with simultaneous EEG recording. Furthermore, the largest difference in activity in primary visual areas between detected and undetected targets occurred relativity late (+ 150 ms), after the initial feed forward processing, consistent with the dependence of visual awareness on re-entrant reverberations.

Mathewson, K. Beck, D. Ro, T. Fabiani, M. Gratton, G. (2009). Illuminating awareness: Investigating the temporal and spatial neural dynamics of metacontrast masking using the event-related optical signal [Abstract]. Journal of Vision, 9(8):765, 765a, http://journalofvision.org/9/8/765/, doi:10.1167/9.8.765. [CrossRef]
×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×