August 2009
Volume 9, Issue 8
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2009
Effects of orientation specific visual deprivation in adults measured using altered reality
Author Affiliations
  • Stephen Engel
    Department of Psychology, University of Minnesota
  • Peng Zhang
    Department of Psychology, University of Minnesota
  • Min Bao
    Department of Psychology, University of Minnesota
  • Miyoung Kwon
    Department of Psychology, University of Minnesota
  • Sheng He
    Department of Psychology, University of Minnesota
Journal of Vision August 2009, Vol.9, 848. doi:10.1167/9.8.848
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to Subscribers Only
      Sign In or Create an Account ×
    • Get Citation

      Stephen Engel, Peng Zhang, Min Bao, Miyoung Kwon, Sheng He; Effects of orientation specific visual deprivation in adults measured using altered reality. Journal of Vision 2009;9(8):848. doi: 10.1167/9.8.848.

      Download citation file:


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

      ×
  • Supplements
Abstract

Environmental manipulations produce strong cortical plasticity in developing animals (e.g. “stripe-rearing”), but few methods are available to alter the environment of adult humans. We developed novel technology to allow manipulations targeted to known visual mechanisms, and demonstrated it by removing energy from the environment at a specific orientation. Eight subjects viewed the world using an “altered reality” system, comprised of a head mounted gray-scale video camera that fed into a laptop computer that in turn drove a luminance calibrated head-mounted display (HMD). Energy at a narrow range of orientations across all spatial frequencies was removed from the video images prior to their display. This filtering was done in real time on the laptop computer using a simple mask in the Fourier domain. Viewing the filtered video images through the HMD, subjects were able to interact with the world, while being deprived of input at a specified orientation. Prior to and following a four-hour period of deprived visual input, contrast detection thresholds were measured for sinusoidal patterns at the removed orientation and at the orthogonal orientation. Patterns were 6 degrees in size, had a spatial frequency of 1 cycle per degree, and were presented centered 8 degrees in the periphery. Thresholds for the removed and orthogonal patterns were equal prior to the deprivation period. Following deprivation, thresholds for the removed orientation were reliably lower (by 18% on average) than thresholds for the orthogonal orientation. Thus visual sensitivity to the deprived orientation improved, suggesting an increase in the gain of orientation selective mechanisms. The altered reality technology should be able to produce a variety of environmental manipulations useful for studying plasticity in many different visual mechanisms.

Engel, S. Zhang, P. Bao, M. Kwon, M. He, S. (2009). Effects of orientation specific visual deprivation in adults measured using altered reality [Abstract]. Journal of Vision, 9(8):848, 848a, http://journalofvision.org/9/8/848/, doi:10.1167/9.8.848. [CrossRef]
Footnotes
 Supported by UMN Digital Technology Institute
×
×

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.

×