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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Editor: Steven A. Burns
  • Vol. 24, Iss. 9 — Sep. 1, 2007
  • pp: 2499–2504

Orientation variance discrimination in amblyopia

Behzad Mansouri, Robert F. Hess, and Harriet A. Allen  »View Author Affiliations

JOSA A, Vol. 24, Issue 9, pp. 2499-2504 (2007)

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Our previous results showed that while amblyopes can efficiently integrate visual signals, they are poor at segregating signals in noise. This could be either because integration detectors have broader bandwidths or because of a selective extrastriate segregation anomaly. One consequence of the former would be poorer variance discrimination. Using a two-alternative forced-choice paradigm, observers were asked to judge the orientational variance for arrays of 16 Gabors. All observers, be they normal or amblyopic, could perform the task similarly, although at high spatial frequencies, amblyopic eyes needed slightly more incremental variance than the normal eyes. We conclude that normals and amblyopes integrate signals in a similar way.

© 2007 Optical Society of America

OCIS Codes
(330.5510) Vision, color, and visual optics : Psychophysics
(330.7310) Vision, color, and visual optics : Vision

ToC Category:
Vision, color, and visual optics

Original Manuscript: February 16, 2007
Revised Manuscript: April 5, 2007
Manuscript Accepted: April 20, 2007
Published: July 6, 2007

Virtual Issues
Vol. 2, Iss. 10 Virtual Journal for Biomedical Optics

Behzad Mansouri, Robert F. Hess, and Harriet A. Allen, "Orientation variance discrimination in amblyopia," J. Opt. Soc. Am. A 24, 2499-2504 (2007)

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  1. A. J. Simmers, T. Ledgeway, R. F. Hess, and P. V. McGraw, "Deficits to global motion processing in human amblyopia," Vision Res. 43, 729-738 (2003). [CrossRef] [PubMed]
  2. A. J. Simmers, T. Ledgeway, and R. F. Hess, "The influences of visibility and anomalous integration processes on the perception of global spatial form versus motion in human amblyopia," Vision Res. 45, 449-460 (2005). [CrossRef]
  3. B. Mansouri and R. F. Hess, "The global processing deficit in amblyopia involves noise segregation," Vision Res. 46, 4104-4117 (2006). [CrossRef] [PubMed]
  4. B. Mansouri, H. A. Allen, R. F. Hess, S. C. Dakin, and O. Ehrt, "Integration of orientation information in amblyopia," Vision Res. 44, 2955-2969 (2004). [CrossRef] [PubMed]
  5. R. F. Hess, B. Mansouri, S. C. Dakin, and H. A. Allen, "Integration of local motion is normal in amblyopia," J. Opt. Soc. Am. A 23, 986-992 (2006). [CrossRef]
  6. J. A. Movshon, E. H. Adelson, M. S. Gizzi, and W. T. Newsome, "The analysis of moving visual patterns," in Pattern Recognition Mechanisms, C.Chagas, R.Gattass, and C.Gross, eds. (Vatican Press, 1985), pp. 117-151.
  7. W. T. Newsome and E. B. Pare, "A selective impairment of motion perception following lesions of the middle temporal visual area (MT)," J. Neurosci. 8, 2201-2211 (1988). [PubMed]
  8. C. L. Baker, Jr., R. F. Hess, and J. Zihl, "Residual motion perception in a "motion-blind" patient, assessed with limited-lifetime random dot stimuli," J. Neurosci. 11, 454-461 (1991). [PubMed]
  9. D. H. Brainard, "The Psychophysics Toolbox," Spatial Vis. 10, 433-436 (1997). [CrossRef]
  10. D. G. Pelli, "The Video Toolbox software for visual psychophysics: transforming numbers into movies," Spatial Vis. 10, 437-442 (1997). [CrossRef]
  11. D. G. Pelli and L. Zhang, "Accurate control of contrast on microcomputer displays," Vision Res. 31, 1337-1350 (1991). [CrossRef] [PubMed]
  12. R. F. Hess and A. Bradley, "Contrast coding in amblyopia is only minimally impaired above threshold," Nature 287, 463-464 (1980). [CrossRef] [PubMed]
  13. R. J. Watt and D. Andrews, "APE: adaptive probit estimation of psychometric functions," Cur. Psychol. Rev. 1, 205-214 (1981).
  14. D. H. Foster and W. F. Bischof, "Bootstrap variance estimators for the parameters of small-sample sensory-performance functions," Biol. Cybern. 57, 341-347 (1987). [CrossRef] [PubMed]
  15. R. F. Hess and E. R. Howell, "The threshold contrast sensitivity function in strabismic amblyopia: evidence for a two type classification," Vision Res. 17, 1049-1055 (1977). [CrossRef] [PubMed]
  16. R. F. Hess, T. Ledgeway, and S. Dakin, "Impoverished second-order input to global linking in human vision," Vision Res. 40, 3309-3318 (2000). [CrossRef] [PubMed]
  17. D. Regan, Human Perception of Objects (Sinauer Associates Inc., 2000).
  18. D. M. Levi, R. S. Harwerth, and E. L. Smith, "Binocular interactions in normal and anomalous binocular vision," Doc. Ophthalmol. 49, 303-324 (1980). [CrossRef] [PubMed]
  19. L. Kiorpes, "Visual processing in amblyopia: animal studies," Strabismus 14, 3-10 (2006). [CrossRef] [PubMed]
  20. L. Kiorpes, D. C. Kiper, L. P. O'Keefe, J. R. Cavanaugh, and J. A. Movshon, "Neuronal correlates of amblyopia in the visual cortex of macaque monkeys with experimental strabismus and anisometropia," J. Neurosci. 18, 6411-6424 (1998). [PubMed]
  21. B. C. Skottun, A. Bradley, and R. D. Freeman, "Orientation discrimination in amblyopia," Invest. Ophthalmol. Visual Sci. 27, 532-537 (1986).
  22. I. Rentschler and R. Hilz, "Abnormal orientation selectivity in both eyes of strabismic amblyopes," Exp. Brain Res. 37, 187-191 (1979). [CrossRef] [PubMed]
  23. E. Vandenbussche, R. Vogels, and G. A. Orban, "Human orientation discrimination: changes with eccentricity in normal and amblyopic vision," Invest. Ophthalmol. Visual Sci. 27, 237-245 (1986).
  24. R. Demanins, R. F. Hess, C. B. Williams, and D. R. Keeble, "The orientation discrimination deficit in strabismic amblyopia depends upon stimulus bandwidth," Vision Res. 39, 4018-4031 (1999). [CrossRef]
  25. B. T. Barrett, I. E. Pacey, A. Bradley, L. N. Thibos, and P. Morrill, "Nonveridical visual perception in human amblyopia," Invest. Ophthalmol. Visual Sci. 44, 1555-1567 (2003). [CrossRef]
  26. R. F. Hess, F. W. Campbell, and T. Greenhalgh, "On the nature of the neural abnormality in human amblyopia; neural aberrations and neural sensitivity loss," Pfluegers Arch. Eur. J. Physiol. 377, 201-207 (1978).

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