DENNIS MICHAEL LEVI

Summary

Affiliation: University of California
Country: USA

Publications

  1. ncbi request reprint Perceptual learning in adults with amblyopia: a reevaluation of critical periods in human vision
    Dennis M Levi
    School of Optometry and Helen Wills Neuroscience Institute, University of California, Berkeley, Berkeley, CA 94720 2020, USA
    Dev Psychobiol 46:222-32. 2005
  2. doi request reprint The effect of flankers on three tasks in central, peripheral, and amblyopic vision
    Dennis M Levi
    School of Optometry and Helen Wills Neuroscience Institute, UC Berkeley, Berkeley, CA, USA
    J Vis 11:10. 2011
  3. pmc Crowding--an essential bottleneck for object recognition: a mini-review
    Dennis M Levi
    University of California at Berkeley, School of Optometry and The Helen Wills Neuroscience Institute, Berkeley, CA 94720 2020, USA
    Vision Res 48:635-54. 2008
  4. pmc Crowding between first- and second-order letter stimuli in normal foveal and peripheral vision
    Susana T L Chung
    College of Optometry and Center for Neuro Engineering and Cognitive Science, University of Houston, Houston, TX, USA
    J Vis 7:10.1-13. 2007
  5. ncbi request reprint Extended perceptual learning results in substantial recovery of positional acuity and visual acuity in juvenile amblyopia
    Roger W Li
    School of Optometry, University of California Berkeley, Berkeley, CA 94720 2020, USA
    Invest Ophthalmol Vis Sci 48:5046-51. 2007
  6. pmc Training the brain to overcome the effect of aging on the human eye
    Uri Polat
    School of Optometry and Helen Wills Neuroscience Institute, UC Berkeley, Berkeley, CA, USA
    Sci Rep 2:278. 2012
  7. pmc Prentice award lecture 2011: removing the brakes on plasticity in the amblyopic brain
    Dennis M Levi
    School of Optometry and Helen Wills Neuroscience Institute, University of California Berkeley, CA 94720, USA
    Optom Vis Sci 89:827-38. 2012
  8. pmc Improving the performance of the amblyopic visual system
    Dennis M Levi
    School of Optometry and The Helen Wills Neuroscience Institute, University of California, Berkeley, CA 94720 2020, USA
    Philos Trans R Soc Lond B Biol Sci 364:399-407. 2009
  9. doi request reprint What limits performance in the amblyopic visual system: seeing signals in noise with an amblyopic brain
    Dennis M Levi
    School of Optometry and Helen Wills Neuroscience Institute, UC Berkeley, Berkeley, CA 94720 2020, USA
    J Vis 8:1.1-23. 2008
  10. doi request reprint Amblyopic reading is crowded
    Dennis M Levi
    School of Optometry and Helen Wills Neuroscience Institute, UC Berkeley, Berkeley, CA 94720 2020, USA
    J Vis 7:21.1-17. 2007

Detail Information

Publications67

  1. ncbi request reprint Perceptual learning in adults with amblyopia: a reevaluation of critical periods in human vision
    Dennis M Levi
    School of Optometry and Helen Wills Neuroscience Institute, University of California, Berkeley, Berkeley, CA 94720 2020, USA
    Dev Psychobiol 46:222-32. 2005
    ..It is hypothesized that these same mechanisms account for at least some of the improvement that occurs in the treatment of amblyopia...
  2. doi request reprint The effect of flankers on three tasks in central, peripheral, and amblyopic vision
    Dennis M Levi
    School of Optometry and Helen Wills Neuroscience Institute, UC Berkeley, Berkeley, CA, USA
    J Vis 11:10. 2011
    ..On the other hand, in peripheral vision and strabismic amblyopia, the effects of flankers on orientation discrimination and to a lesser extent contrast discrimination cannot be explained by simple masking and are due to crowding...
  3. pmc Crowding--an essential bottleneck for object recognition: a mini-review
    Dennis M Levi
    University of California at Berkeley, School of Optometry and The Helen Wills Neuroscience Institute, Berkeley, CA 94720 2020, USA
    Vision Res 48:635-54. 2008
    ..A full understanding of crowding may allow us to understand this bottleneck to object recognition and the rules that govern the integration of features into objects...
  4. pmc Crowding between first- and second-order letter stimuli in normal foveal and peripheral vision
    Susana T L Chung
    College of Optometry and Center for Neuro Engineering and Cognitive Science, University of Houston, Houston, TX, USA
    J Vis 7:10.1-13. 2007
    ..Our finding of substantial interaction between first- and second-order stimuli suggests that the processing of these stimuli is not independent at the stage of processing at which crowding occurs...
  5. ncbi request reprint Extended perceptual learning results in substantial recovery of positional acuity and visual acuity in juvenile amblyopia
    Roger W Li
    School of Optometry, University of California Berkeley, Berkeley, CA 94720 2020, USA
    Invest Ophthalmol Vis Sci 48:5046-51. 2007
    ..The present study was conducted to determine whether extended training is necessary for optimal treatment of amblyopia...
  6. pmc Training the brain to overcome the effect of aging on the human eye
    Uri Polat
    School of Optometry and Helen Wills Neuroscience Institute, UC Berkeley, Berkeley, CA, USA
    Sci Rep 2:278. 2012
    ..This improvement was achieved without changing the optical characteristics of the eye. The results suggest that the aging brain retains enough plasticity to overcome the natural biological deterioration with age...
  7. pmc Prentice award lecture 2011: removing the brakes on plasticity in the amblyopic brain
    Dennis M Levi
    School of Optometry and Helen Wills Neuroscience Institute, University of California Berkeley, CA 94720, USA
    Optom Vis Sci 89:827-38. 2012
    ..These findings, along with the results of new clinical trials, suggest that it might be time to reconsider our notions about neural plasticity in amblyopia...
  8. pmc Improving the performance of the amblyopic visual system
    Dennis M Levi
    School of Optometry and The Helen Wills Neuroscience Institute, University of California, Berkeley, CA 94720 2020, USA
    Philos Trans R Soc Lond B Biol Sci 364:399-407. 2009
    ..These findings, along with the results of new clinical trials, suggest that it might be time to reconsider our notions about neural plasticity in amblyopia...
  9. doi request reprint What limits performance in the amblyopic visual system: seeing signals in noise with an amblyopic brain
    Dennis M Levi
    School of Optometry and Helen Wills Neuroscience Institute, UC Berkeley, Berkeley, CA 94720 2020, USA
    J Vis 8:1.1-23. 2008
    ..This loss is more or less independent of external noise contrast over a log unit range of external noise...
  10. doi request reprint Amblyopic reading is crowded
    Dennis M Levi
    School of Optometry and Helen Wills Neuroscience Institute, UC Berkeley, Berkeley, CA 94720 2020, USA
    J Vis 7:21.1-17. 2007
    ..The uncrowded-span model of normal reading fits the amblyopic results well, with a roughly fivefold increase in the critical spacing at fixation. Thus, the entire amblyopic reading deficit is accounted for by crowding...
  11. ncbi request reprint "Phase capture" in amblyopia: the influence function for sampled shape
    Dennis M Levi
    University of California, Berkeley, School of Optometry and Helen Wills Neuroscience Institute, Berkeley, CA 94720 2020, USA
    Vision Res 45:1793-805. 2005
    ..We speculate that this may be a consequence of abnormal "crowding" of the inner patches by the outer ones...
  12. ncbi request reprint What is the signal in noise?
    Dennis M Levi
    University of California, Berkeley, School of Optometry and The Helen Wills Neuroscience Institute, Berkeley, CA 94720 2020, USA
    Vision Res 45:1835-46. 2005
    ..Surprisingly, we found that the human template is "adaptive"-- its shape depends on the spatial frequency band of the noise-suggesting that sensitivity to spatial noise is not simply determined via passive filtering...
  13. pmc The response of the amblyopic visual system to noise
    Dennis M Levi
    University of California, Berkeley, School of Optometry and The Helen Wills Neuroscience Institute, Berkeley, CA 94720 2020, USA
    Vision Res 47:2531-42. 2007
    ..However, for the discrimination of suprathreshold white noise contrast, there is surprisingly little additional deficit, after accounting for the visibility of the noise...
  14. pmc Image segregation in strabismic amblyopia
    Dennis M Levi
    School of Optometry and Helen Wills Neuroscience Institute, University of California, Berkeley, CA 94720 2020, USA
    Vision Res 47:1833-8. 2007
    ..I therefore conclude that these deficits are not a consequence of abnormal segregation of figure from background...
  15. pmc Global contour processing in amblyopia
    Dennis M Levi
    School of Optometry and Helen Wills Neuroscience Institute, University of California, Berkeley, CA 94720 2020, USA
    Vision Res 47:512-24. 2007
    ..The residual deficits reported here cannot be simply ascribed to reduced visibility or increased positional uncertainty, and we therefore conclude that these are genuine deficits in global contour segregation and integration...
  16. ncbi request reprint Is the ability to identify deviations in multiple trajectories compromised by amblyopia?
    Dennis M Levi
    School of Optometry and Helen Wills Neuroscience Institute, UC Berkeley, Berkeley, CA 94720 2020, USA
    J Vis 6:1367-79. 2006
    ..We conclude that while amblyopia disrupts static angle discrimination, amblyopic dynamic deviation detection thresholds are normal or very nearly so...
  17. ncbi request reprint Perception of mirror symmetry in amblyopic vision
    Dennis Levi
    School of Optometry, Helen Wills Neuroscience Institute, University of California, Berkeley, CA 94720 2020, USA
    Vision Res 44:2475-82. 2004
    ..Rather, we suggest that this loss may reflect, at least in part, a deficit in the integration of local orientation information...
  18. pmc Perceptual learning as a potential treatment for amblyopia: a mini-review
    Dennis M Levi
    School of Optometry and The Helen Wills Neuroscience Institute, University of California, Berkeley, CA 94720 2020, United States
    Vision Res 49:2535-49. 2009
    ..The success of PL raises the question of whether it should become a standard part of the armamentarium for the clinical treatment of amblyopia, and suggests several important principles for effective perceptual learning in amblyopia...
  19. pmc Visual deficits in anisometropia
    Dennis M Levi
    School of Optometry and Helen Wills Neuroscience Institute, University of California, Berkeley, CA 94720, USA
    Vision Res 51:48-57. 2011
    ..We conclude that even modest interocular differences in refractive error can influence visual function...
  20. doi request reprint Amblyopia masks the scale invariance of normal central vision
    Dennis M Levi
    School of Optometry and Helen Wills Neuroscience Institute, UC Berkeley, Berkeley, CA, USA
    J Vis 9:22.1-11. 2009
    ....
  21. pmc Crowding in peripheral vision: why bigger is better
    Dennis M Levi
    School of Optometry and Helen Wills Neuroscience Institute, University of California, Berkeley, Berkeley, CA 94720 2020, USA
    Curr Biol 19:1988-93. 2009
    ..5x the target eccentricity. These features are then integrated into a texture beyond the stage of feature analysis. We speculate that this process may contribute to the illusion of high resolution across the field of vision...
  22. ncbi request reprint Temporal dynamics of figure-ground segregation in human vision
    Peter Neri
    School of Optometry, University of California at Berkeley, Berkeley, CA, USA
    J Neurophysiol 97:951-7. 2007
    ..Figure enhancement within this narrow temporal window was transient rather than sustained as may be expected from measurements in single neurons. These psychophysical results prompt and guide further electrophysiological studies...
  23. pmc Sensitivity to biological motion drops by approximately 1/2 log-unit with inversion, and is unaffected by amblyopia
    Peter Neri
    School of Optometry, University of California at Berkeley, Berkeley, CA 94720 2020, USA
    Vision Res 47:1209-14. 2007
    ..Our data provide a quantitative estimate of the inversion effect for biological motion, and demonstrate that higher-level processing in the motion hierarchy is not affected by amblyopia...
  24. ncbi request reprint Spatial resolution for feature binding is impaired in peripheral and amblyopic vision
    Peter Neri
    School of Optometry and Helen Wills Neuroscience Institute, University of California, Berkeley, CA 94720 2020, USA
    J Neurophysiol 96:142-53. 2006
    ..Our results in persons with amblyopia indicate that the ability of the fovea to compensate for this poor co-registration is consolidated by visual experience during postnatal development...
  25. ncbi request reprint Spatial interactions reveal inhibitory cortical networks in human amblyopia
    Erwin H Wong
    School of Optometry, University of California, Berkeley, CA 94720, USA
    Vision Res 45:2810-9. 2005
    ..Furthermore, strabismic observers with no loss of visual acuity show a similar pattern of detection suppression. We speculate that amblyopia results in predominantly inhibitory cortical interactions between second-order neurons...
  26. ncbi request reprint Second-order spatial summation in amblyopia
    Erwin H Wong
    School of Optometry, University of California, Berkeley, CA 94720, USA
    Vision Res 45:2799-809. 2005
    ..We conclude that the pooling of second-order contrast across visual space is unaffected by amblyopia...
  27. ncbi request reprint Meaningful interactions can enhance visual discrimination of human agents
    Peter Neri
    School of Optometry, University of California at Berkeley, Berkeley, California 94720 2020, USA
    Nat Neurosci 9:1186-92. 2006
    ..Our results demonstrate that action understanding has a pervasive impact on the human ability to extract visual information from the actions of other humans, providing quantitative evidence of its significance for sensory performance...
  28. ncbi request reprint "Phase capture" in the perception of interpolated shape: cue combination and the influence function
    Dennis M Levi
    School of Optometry, University of California, Berkeley, CA 94720 2020, USA
    Vision Res 43:2233-43. 2003
    ..An ideal observer would weight the cues by the inverse variance of the two cues. The variance in each of these cues predicts the main features of our results quite accurately...
  29. ncbi request reprint Perceptual learning in contrast discrimination and the (minimal) role of context
    Cong Yu
    School of Optometry, University of California, Berkeley, CA, USA
    J Vis 4:169-82. 2004
    ....
  30. pmc Stochastic model for detection of signals in noise
    Stanley A Klein
    School of Optometry, University of California, Berkeley, Berkeley, California 94720, USA
    J Opt Soc Am A Opt Image Sci Vis 26:B110-26. 2009
    ..In addition, we modify present models to better handle detection of signals with both noise and pedestal backgrounds...
  31. pmc Prolonged perceptual learning of positional acuity in adult amblyopia: perceptual template retuning dynamics
    Roger W Li
    School of Optometry and The Helen Wills Neuroscience Institute, University of California, Berkeley, Berkeley, California 94720 2020, USA
    J Neurosci 28:14223-9. 2008
    ..These results show that the mature amblyopic brain is surprisingly malleable, and point to more intensive treatment methods for amblyopia...
  32. doi request reprint Spatiotemporal mechanisms for simple image feature perception in normal and amblyopic vision
    Shuang Song
    Vision Science, University of California, Berkeley, CA, USA
    J Vis 10:21. 2010
    ..Distant flankers induced "anti-crowding" (repulsion) of perceived orientation in both normal and amblyopic vision...
  33. pmc Aging and visual counting
    Roger W Li
    School of Optometry, University of California, Berkeley, California, United States of America
    PLoS ONE 5:e13434. 2010
    ..There is a fundamental question, not yet addressed, of how many visual items the aging visual system can enumerate in a "single glance", without the confounding influence of eye movements...
  34. pmc Learning to identify near-threshold luminance-defined and contrast-defined letters in observers with amblyopia
    Susana T L Chung
    School of Optometry, University of California, 360 Minor Hall, Berkeley, CA 94720 2020, USA
    Vision Res 48:2739-50. 2008
    ..Our findings are consistent with predictions based on the locus of learning for first- and second-order stimuli according to the filter-rectifier-filter model for second-order visual processing...
  35. pmc Collinearity improves alignment in amblyopia as well as in normal vision
    Ariella V Popple
    Optometry, UC Berkeley, CA 94720 2020, USA
    Vision Res 47:1968-73. 2007
    ....
  36. ncbi request reprint The pattern of visual deficits in amblyopia
    Suzanne P McKee
    Smith Kettlewell Institute of Visual Sciences, San Francisco, CA, USA
    J Vis 3:380-405. 2003
    ..Despite their superior contrast sensitivity, non-binocular observers typically have poorer optotype acuity and Vernier acuity, at a given level of grating acuity, than those with residual binocular function...
  37. pmc Attentional blinks as errors in temporal binding
    Ariella V Popple
    School of Optometry and Helen Wills Neuroscience Institute, University of California Berkeley, Berkeley, CA 94720 2020, USA
    Vision Res 47:2973-81. 2007
    ..We suggest that this disruption occurs within a certain time (approximately 0.5 s) after the first target, during which period salient distractors are as likely as the second target to enter working memory...
  38. doi request reprint The attentional blink in amblyopia
    Ariella V Popple
    School of Optometry and Helen Wills Neuroscience Institute, University of California at Berkeley, Berkeley, CA, USA
    J Vis 8:12.1-9. 2008
    ..These findings highlight the role of early (monocular) visual processes in modulating the attentional blink, as well as the role of attention in amblyopic visual deficits...
  39. ncbi request reprint Suppressive and facilitatory spatial interactions in amblyopic vision
    Dennis M Levi
    School of Optometry, University of California, Berkeley, CA 94720, USA
    Vision Res 42:1379-94. 2002
    ..In amblyopic vision, this pooling takes place over a large spatial distance...
  40. ncbi request reprint Characterizing the mechanisms of improvement for position discrimination in adult amblyopia
    Roger W Li
    School of Optometry and Helen Wills Neuroscience Institute, University of California, Berkeley, CA, USA
    J Vis 4:476-87. 2004
    ..Our results reveal the mechanisms underlying perceptual learning in amblyopic vision, and may provide a basis for developing more effective and efficient strategies for the treatment of amblyopia...
  41. ncbi request reprint Cross- and iso- oriented surrounds modulate the contrast response function: the effect of surround contrast
    Cong Yu
    School of Optometry, University of California at Berkeley, Berkeley, CA, USA
    J Vis 3:527-40. 2003
    ..Iso-surround modulation on the other hand is more complicated, probably reflecting more than one surround process as determined by the relative contrast...
  42. ncbi request reprint Noise provides some new signals about the spatial vision of amblyopes
    Dennis M Levi
    University of California at Berkeley, School of Optometry and Helen Wills Neuroscience Institute, Berkeley, California 94720 2020, USA
    J Neurosci 23:2522-6. 2003
    ..We conclude that the loss of efficiency in amblyopia is attributable in part to a poorly matched template, but to a greater degree, to a high fraction of internal (relative to external) noise...
  43. ncbi request reprint The perception of spatial order at a glance
    Ariella V Popple
    School of Optometry and Helen Wills Neuroscience Institute, Berkeley, University of California at Berkeley, Gayley Road, Berkeley, CA 94720 2020, USA
    Vision Res 45:1085-90. 2005
    ..Regardless of spacing and set-size, confusions between neighbors were unexpectedly frequent, suggesting there is positional as well as object uncertainty...
  44. ncbi request reprint Classification images for detection and position discrimination in the fovea and parafovea
    Dennis M Levi
    School of Optometry, University of California, Berkeley, CA, USA
    J Vis 2:46-65. 2002
    ..e., square root of efficiency) and the coarse classification images for peripheral position discrimination. The peripheral position template is a low spatial frequency template...
  45. ncbi request reprint Suppressive and facilitatory spatial interactions in peripheral vision: peripheral crowding is neither size invariant nor simple contrast masking
    Dennis M Levi
    School of Optometry, University of California, Berkeley, CA, USA
    J Vis 2:167-77. 2002
    ..Thus, we speculate that peripheral crowding occurs because the target and flanks are combined or pooled at a second stage, following the stage of feature extraction. In peripheral vision, this pooling takes place over a large distance...
  46. ncbi request reprint Suppressive and facilitatory spatial interactions in foveal vision: foveal crowding is simple contrast masking
    Dennis M Levi
    School of Optometry, University of California, Berkeley, CA, USA
    J Vis 2:140-66. 2002
    ..We suggest that facilitation of detection by remote flanks may be, at least in part, a consequence of uncertainty reduction...
  47. ncbi request reprint Location coding by the human visual system: multiple topological adaptations in a case of strabismic amblyopia
    Ariella V Popple
    School of Optometry, University of California at Berkeley, Berkeley, CA 94720 2020, USA
    Perception 34:87-107. 2005
    ..Instead, the observed behavior suggests that multiple adaptations of the underlying cortical topology are possible simultaneously in different parts of the visual field...
  48. ncbi request reprint Facilitation of contrast detection by cross-oriented surround stimuli and its psychophysical mechanisms
    Cong Yu
    School of Optometry, University of California, Berkeley, CA, USA
    J Vis 2:243-55. 2002
    ..The converging evidence suggests that cross surround facilitation of contrast detection is mainly a result of low-level signal-to-noise enhancement, and is little affected by uncertainty change...
  49. ncbi request reprint The receptive field and internal noise for position acuity change with feature separation
    Roger W Li
    School of Optometry and Helen Wills Neuroscience Institute, University of California, Berkeley, CA 94720, USA
    J Vis 6:311-21. 2006
    ..Although systematic internal noise is thought to be one of the important components limiting detection thresholds, we found that systematic noise is negligible in our position task...
  50. ncbi request reprint Visual processing in amblyopia: human studies
    Dennis M Levi
    University of California at Berkeley, School of Optometry, Berkeley, CA 94720, USA
    Strabismus 14:11-9. 2006
    ..3) There appears to be substantial neural plasticity in the amblyopic brain beyond the "critical period."..
  51. ncbi request reprint Two sources of error in pop-out localization
    Ariella V Popple
    School of Optometry, Helen Wills Neuroscience Institute, UC Berkeley, CA 94720 2020, USA
    Vision Res 46:293-8. 2006
    ....
  52. ncbi request reprint Perceptual learning improves visual performance in juvenile amblyopia
    Roger W Li
    School of Optometry and Helen Wills Neuroscience Institute, University of California Berkeley, Berkeley, CA 94720 2020, USA
    Invest Ophthalmol Vis Sci 46:3161-8. 2005
    ..To determine whether practicing a position-discrimination task improves visual performance in children with amblyopia and to determine the mechanism(s) of improvement...
  53. ncbi request reprint Combining cues in contour orientation discrimination
    Ariella V Popple
    School of Optometry, Minor Hall, University of California at Berkeley, Berkeley, CA 94720 2020, USA
    Vision Res 44:3081-90. 2004
    ..In a series of three experiments, we investigated how these three cues were combined. The data are consistent with weighted cue combination...
  54. ncbi request reprint Spatial-frequency properties of letter identification in amblyopia
    Susana T L Chung
    School of Optometry, Indiana University, Bloomington, IN 47405, USA
    Vision Res 42:1571-81. 2002
    ..Rather, it is a consequence of the difference in the resolution limit between the amblyopic and the non-amblyopic eyes...
  55. ncbi request reprint Receptive versus perceptive fields from the reverse-correlation viewpoint
    Peter Neri
    School of Optometry, University of California, 360 Minor Hall, Berkeley, CA 94720 2020, USA
    Vision Res 46:2465-74. 2006
    ....
  56. ncbi request reprint Perceptual learning improves efficiency by re-tuning the decision 'template' for position discrimination
    Roger W Li
    School of Optometry and Helen Wills Neuroscience Institute, University of California, Berkeley, Berkeley, California 94720 2020, USA
    Nat Neurosci 7:178-83. 2004
    ....
  57. ncbi request reprint Collinearity improves alignment. Response to Keeble and Hess (1998)
    Ariella V Popple
    Vision Res 42:1431-3; author reply 1435-6. 2002
  58. pmc Using visual noise to characterize amblyopic letter identification
    Denis G Pelli
    Psychology and Neural Science, New York University, New York, NY, USA
    J Vis 4:904-20. 2004
    ..Finally, based on these results, we introduce a new "Dual Acuity" chart that promises to be a quick diagnostic test for amblyopia...
  59. pmc Learning to identify contrast-defined letters in peripheral vision
    Susana T L Chung
    College of Optometry and Center for Neuro Engineering and Cognitive Science, University of Houston, Houston, TX, USA
    Vision Res 46:1038-47. 2006
    ..The complete interocular transfer, and the retinotopic (retinal location) and size specificity of the learning effect are consistent with the properties of neurons in early visual area V2...
  60. pmc Learning letter identification in peripheral vision
    Susana T L Chung
    College of Optometry and Center for Neuro Engineering and Cognitive Science, University of Houston, 505 J Davis Armistead Bldg, Houston, TX 77204 2020, USA
    Vision Res 45:1399-412. 2005
    ..Results from both the PTM analysis and the double-pass experiment imply that the stimulus-dependent component of the internal noise does not change with learning...
  61. pmc Crowding between first- and second-order letters in amblyopia
    Susana T L Chung
    College of Optometry and Center for Neuro Engineering and Cognitive Science, University of Houston, Houston, TX, USA
    Vision Res 48:788-98. 2008
    ..Our findings are consistent with the hypothesis that crowding results from an abnormal integration of target and flankers beyond the stage of feature detection, which takes place over a large distance in amblyopic vision...
  62. pmc Integration across Time Determines Path Deviation Discrimination for Moving Objects
    David Whitaker
    Department of Optometry, University of Bradford, Bradford, United Kingdom
    PLoS ONE 3:e1930. 2008
    ..In this study we characterize our ability to judge changes in the direction of motion of objects-a common task which can allow us either to intercept moving objects, or else avoid them if they pose a threat...
  63. doi request reprint On the effective number of tracked trajectories in amblyopic human vision
    Srimant P Tripathy
    Division of Optometry, School of Life Sciences, University of Bradford, Bradford, United Kingdom
    J Vis 8:8.1-22. 2008
    ..A comparison with data previously published for normal eyes failed to reveal any deficit in the effective number of trajectories tracked by the non-amblyopic eyes of amblyopic observers for the current task...
  64. pmc Identification of contrast-defined letters benefits from perceptual learning in adults with amblyopia
    Susana T L Chung
    College of Optometry and Center for Neuro Engineering and Cognitive Science, University of Houston, Houston, TX, USA
    Vision Res 46:3853-61. 2006
    ....
  65. ncbi request reprint "Crowding" in normal and amblyopic vision assessed with Gaussian and Gabor C's
    Srividhya Hariharan
    College of Optometry, University of Houston, Houston, TX 77204 6052, USA
    Vision Res 45:617-33. 2005
    ..Instead we suggest that crowding in amblyopic and peripheral vision is a result of extended pooling at a stage following the stage of feature detection...
  66. ncbi request reprint The essential role of stimulus temporal patterning in enabling perceptual learning
    Shu Guang Kuai
    Institute of Neuroscience, Chinese Academy of Sciences, Shanghai 200031, China
    Nat Neurosci 8:1497-9. 2005
    ..This temporal patterning does not facilitate learning by reducing stimulus uncertainty; further, learning enabled by temporal patterning can later generalize to randomly presented stimuli...
  67. pmc Stimulus coding rules for perceptual learning
    Jun Yun Zhang
    State Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University, Beijing, China
    PLoS Biol 6:e197. 2008
    ..Stimulus temporal patterning assists in tagging stimuli and switching attention through its rhythmic stimulus sequence...

Research Grants11

  1. LIMITING FACTORS IN NORMAL AND AMBLYOPIC SPATIAL VISION
    DENNIS MICHAEL LEVI; Fiscal Year: 2011
    ..abstract_text> ..
  2. LIMITING FACTORS IN NORMAL AND AMBLYOPIC SPATIAL VISION
    DENNIS MICHAEL LEVI; Fiscal Year: 2010
    ..abstract_text> ..
  3. LIMITING FACTORS IN NORMAL AND AMBLYOPIC SPATIAL VISION
    Dennis Levi; Fiscal Year: 2007
    ....
  4. LIMITING FACTORS IN NORMAL AND AMBLYOPIC SPATIAL VISION
    Dennis Levi; Fiscal Year: 2006
    ....
  5. LIMITING FACTORS IN NORMAL AND AMBLYOPIC SPATIAL VISION
    Dennis Levi; Fiscal Year: 2005
    ....
  6. LIMITING FACTORS IN NORMAL AND AMBLYOPIC SPATIAL VISION
    Dennis Levi; Fiscal Year: 2003
    ....
  7. LIMITING FACTORS IN NORMAL AND AMBLYOPIC SPATIAL VISION
    Dennis Levi; Fiscal Year: 2004
    ....
  8. LIMITING FACTORS IN NORMAL AND AMBLYOPIC SPATIAL VISION
    Dennis Levi; Fiscal Year: 2009
    ..abstract_text> ..
  9. A new approach to restoring visual acuity and stereopsis in adults and children w
    DENNIS MICHAEL LEVI; Fiscal Year: 2010
    ..The relevance of this project is in developing new, effective interventions for restoring visual acuity and stereopsis in adults and children with amblyopia. ..
  10. LIMITING FACTORS IN NORMAL AND AMBLYOPIC SPATIAL VISION
    Dennis Levi; Fiscal Year: 2002
    ....