June 2007
Volume 7, Issue 9
Free
Vision Sciences Society Annual Meeting Abstract  |   June 2007
Percept-dependent modulations of neuronal activity occur earlier for shape than for colour stimuli
Author Affiliations
  • Sandra Veser
    Institute of Psychology I, University of Leipzig, Seeburstr.14-20, 04103 Leipzig, Germany
  • Urte Roeber
    Institute of Psychology I, University of Leipzig, Seeburstr.14-20, 04103 Leipzig, Germany
  • Erich Schröger
    Institute of Psychology I, University of Leipzig, Seeburstr.14-20, 04103 Leipzig, Germany
Journal of Vision June 2007, Vol.7, 371. doi:10.1167/7.9.371
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to Subscribers Only
      Sign In or Create an Account ×
    • Get Citation

      Sandra Veser, Urte Roeber, Erich Schröger; Percept-dependent modulations of neuronal activity occur earlier for shape than for colour stimuli. Journal of Vision 2007;7(9):371. doi: 10.1167/7.9.371.

      Download citation file:


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

      ×
  • Supplements
Abstract

Binocular rivalry occurs when dissimilar images are presented to the two eyes. That is, at one time only a single image is perceived while the other is suppressed. Hierarchical models claim that binocular rivalry can occur at different levels within the visual process. In this study, we compared the time course of percept-dependent neural responses between a condition with stimuli of different colours and a condition with stimuli of different shapes. Equiluminant red/black or green/black radial frequency patterns of different shapes were presented dichoptically. Rivalling stimuli either differed in colour but had the same shape (report-perceived-colour task) or differed in shape but had the same colour (report-perceived-shape task). We measured event-related brain potentials (ERPs) following transitions from rivalling to non-rivalling stimulation. Depending on the prevailing percept reported by the observer, these transitions could concern the eye that was dominant (incompatible change) or suppressed (compatible change). Our results show that the first percept-dependent modulation of the ERP following shape rivalry occurs earlier (around 120 ms, P1-range) than the first percept-dependent modulation following colour rivalry (around 230 ms, N1-range). In both cases, incompatible changes elicited larger amplitudes than compatible changes. In conclusion, stimulus features determine the stage of percept-dependent processing of visual stimuli with shape-based processing being influenced earlier than colour-based processing.

Veser, S. Roeber, U. Schröger, E. (2007). Percept-dependent modulations of neuronal activity occur earlier for shape than for colour stimuli [Abstract]. Journal of Vision, 7(9):371, 371a, http://journalofvision.org/7/9/371/, doi:10.1167/7.9.371. [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.

×