August 2009
Volume 9, Issue 8
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2009
Rapid estimation of the spatiotemporal contrast sensitivity surface
Author Affiliations
  • Luis Andres Lesmes
    Salk Institute for Biological Studies, La Jolla, USA
  • Sergei Gepshtein
    Salk Institute for Biological Studies, La Jolla, USA, and Brain Science Institute, RIKEN
  • Zhong-Lin Lu
    University of Southern California, Los Angeles, USA
  • Thomas Albright
    Salk Institute for Biological Studies, La Jolla, USA
Journal of Vision August 2009, Vol.9, 696. doi:10.1167/9.8.696
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      Luis Andres Lesmes, Sergei Gepshtein, Zhong-Lin Lu, Thomas Albright; Rapid estimation of the spatiotemporal contrast sensitivity surface. Journal of Vision 2009;9(8):696. doi: 10.1167/9.8.696.

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

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Abstract

Purpose. The spatiotemporal contrast sensitivity surface (CSS) describes visual sensitivity (1/threshold) to moving or flickering gratings as a function of spatial and temporal frequency1. The CSS provides a fundamental characterization of the visual system in both normal and clinical populations. Many neuro-ocular diseases exhibit characteristic frequency-specific deficits on the CSS2. To overcome the long testing times typical needed to measure the CSS, we develop a family of adaptive methods for its rapid estimation.

Method. The CSS is typically studied in orthogonal and diagonal slices through its surface: spatial contrast sensitivity functions (CSFs) at fixed temporal frequencies, temporal CSFs at fixed spatial frequencies, or constant-speed CSFs at co-varied spatial and temporal frequencies. We estimated these contrast sensitivity slices by combining Bayesian adaptive inference with a trial-to-trial information-gain strategy3. To estimate the entire CSS, our novel procedure combined the information gained from adaptive runs dedicated to individual slices. Before each trial, the procedure evaluated expected gain within individual slices (6 spatial, 6 temporal, and 7 speeds) and selected a stimulus maximizing the information gain expected among all the slices. The final CSS estimate combined the surface estimates from all slices. In psychophysical experiments, we measured human sensitivity for motion direction discrimination over a large range of spatial (0.5–8 cycles/deg) and temporal frequencies (0.25–24 Hz).

Results. Simulation and psychophysical results suggest accurate CSS estimates are possible within 300–500 trials (15–25 minutes) with an average precision of 2–3 dB. Monte Carlo sampling of posteriors provides confidence regions for the CSS based on single adaptive runs.

Conclusion. This procedure offers a useful tool for clinical and practical applications that require a rapid but comprehensive evaluation of visual sensitivity.

Lesmes, L.A. Gepshtein, S. Lu, Z.-L. Albright, T. (2009). Rapid estimation of the spatiotemporal contrast sensitivity surface [Abstract]. Journal of Vision, 9(8):696, 696a, http://journalofvision.org/9/8/696/, doi:10.1167/9.8.696. [CrossRef]
Footnotes
1.  Kelly (1979)
Footnotes
2.  Regan (1991)
Footnotes
3.  Lesmes et al. (2008)
Footnotes
 Supported by National Eye Institute, the Japanese Institute of Natural Sciences, and Swartz Foundation.
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