Location of Repository

On the decline of 1st and 2nd order sensitivity with eccentricity

By Robert F. Hess, Daniel H. Baker, Keith A. May and Jian Wang

Abstract

We studied the relationship between the decline in sensitivity that occurs with eccentricity for stimuli of different spatial scale defined by either luminance (LM) or contrast (CM) modulation. We show that the detectability of CM stimuli declines with eccentricity in a spatial frequency-dependent manner, and that the rate of sensitivity decline for CM stimuli is roughly that expected from their 1st order carriers, except, possibly, at finer scales. Using an equivalent noise paradigm, we investigated the possible reasons for why the foveal sensitivity for detecting LM and CM stimuli differs as well as the reason why the detectability of 1st order stimuli declines with eccentricity. We show the former can be modeled by an increase in internal noise whereas the latter involves both an increase in internal noise and a loss of efficiency. To encompass both the threshold and suprathreshold transfer properties of peripheral vision, we propose a model in terms of the contrast gain of the underlying mechanisms

Topics: RE, BF
Year: 2008
OAI identifier: oai:eprints.soton.ac.uk:50126
Provided by: e-Prints Soton

Suggested articles

Preview

Citations

  1. (2006). Contrast-modulated stimuli detection is unaffected by luminance modulated noise [Abstract].
  2. (1994). Human luminance pattern-vision mechanisms: Masking experiments require a new model.
  3. (1997). Image quality and entropy masking.
  4. (1997). Object detection in natural backgrounds predicted by discrimination performance and models.
  5. (1981). Probability summation and regional variation in contrast sensitivity across the visual field.
  6. (2006). Same calculation efficiency but different internal noise for luminanceand contrast-modulated stimuli detection.
  7. (2006). Secondorder spatial frequency and orientation channels in human vision.
  8. (1965). Sequential estimation of points on a psychometric function.
  9. (1979). Size, scatter and coverage of ganglion cell receptive field centres in the cat retina.
  10. (2002). Suppression without inhibition in visual cortex.
  11. (1981). The effects of visual noise. PhD thesis,
  12. (1990). The quantum efficiency of vision. In
  13. (1894). Uber die indirekte Sehscha ¨rfe.
  14. (1985). Uncertainty explains many aspects of visual contrast detection and discrimination.

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.