September 2015
Volume 15, Issue 12
Free
Vision Sciences Society Annual Meeting Abstract  |   September 2015
Time compression in an unadapted region after adaptation to a moving surround
Author Affiliations
  • Soki Nakamura
    Department of Psychology, The University of Tokyo
  • Ikuya Murakami
    Department of Psychology, The University of Tokyo
Journal of Vision September 2015, Vol.15, 810. doi:10.1167/15.12.810
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      Soki Nakamura, Ikuya Murakami; Time compression in an unadapted region after adaptation to a moving surround. Journal of Vision 2015;15(12):810. doi: 10.1167/15.12.810.

      Download citation file:


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

      ×
  • Supplements
Abstract

After adaptation to a rapidly moving grating, a drifting grating placed at the adapted region appears to last shorter than its actual duration (“adaptation-based time compression”, Johnston et al 2006). This effect occurs retinotopically (Bruno et al 2010), though there might be some spatiotopic component as well (Burr et al 2007). The spatial tuning of this effect has been reported to have a narrow spatial window (Ayhan et al 2009), such that the effect of adaptation never transfers to unadapted locations in its vicinity. However, previous testing methods of spatial interactions should be revised so as to maximize potential effects of adaptation by overwhelming a test stimulus with a large enough adaptor completely surrounding the test region. To this end, we used a concentric configuration: centered at 8° eccentricity, a rapidly moving (10 Hz) sinusoidal adapting grating that alternated its direction every second occupied the annular region (outer diam 11.4°, inner 7.6°) for 32-s initial and 8-s top-up adaptation periods, each followed by a drifting (10 Hz) sinusoidal grating (diam 5.7°) presented as the test stimulus only within the central region for 0.6 s. In the opposite (left) hemifield, we also presented a reference stimulus, which was also a sinusoidal grating with the same parameters as the test except that the motion direction was opposite and that the duration was variable (0.3–0.9 s). Observers had to judge which stimulus lasted longer. Even though the test stimulus was located at a region with no former adaptation, we found a robust time compression (~10%), which was sometimes as strong as the effect obtained with retinotopic adaptation. Our results indicate some involvement of higher-order motion processing mechanisms that can deal with spatial interactions over a considerable space constant, although our findings do not necessarily refute the hypothesis of the magnocellular pathway’s contribution.

Meeting abstract presented at VSS 2015

×
×

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.

×