Sing-Hang Cheung

Contact: sing{at}umn.edu

My brain

Where am I?

• Location

  Minnesota Laboratory for Low-Vision Research
  Department of Psychology, University of Minnesota, Twin Cities
  75 East River Road, Minneapolis, MN 55455
  1 (612) 625-4516
  

• Academic career

  Fifth-year (hopefully, final-year) PhD student of Prof. Gordon Legge

  In the last couple years, Prof. Sheng He has also been acting like an "adopted" advisor to me.

Research Interests

Up till now, all of my research can be traced back to one single motivation: to help building up our understanding of low vision. Methodology involved in my research includes psychophysics and functional magnetic resonance imaging (fMRI).

• Effects of a limited field of view on object recognition

  People with low vision often rely on using magnifiers for different visual tasks. However, the usage of magnifiers results in a limited field of view (a.k.a. window size). This project investigates human performance in an object recognition task using different window sizes.

• Perceptual learning in peripheral vision

  People with central vision loss (e.g. from age-related macular degeneration) need to use their peripheral vision in different visual tasks, e.g., reading. Reading with peripheral vision has been shown to be difficult. Can perceptual learning of a simple letter-recognition task benefit reading in peripheral vision?

• Retinotopic reorganization in central vision loss

  Research has shown that the brain is plastic and is capable of reorganization under certain circumstances. While the visual cortex has a retinotopic organization, what happens in the visual cortex among those with central vision loss?

• Cortical reorganization resulting in a multimodal visual cortex

  The visual cortex in blind people is employed for Braille reading and other tactile tasks. What will happen in the visual cortex of someone who reads Braille, due to severe vision loss, but has functional residual vision at the same time?

Publications

1. Cheung, S.-H., Legge, G. E., & He, S. (in preparation). Retinotopically specific reorganization of visual cortex for reading Braille and print.

2. Cheung, S.-H., & Legge, G. E. (2005). Functional and cortical adaptations to central vision loss. Visual Neuroscience 22, 187-201. [ PubMed ]

3. Legge, G. E., & Cheung, S.-H. (2004). Psychophysics of reading: Implications for displaying text. SID Symposium Digest of Technical Papers 35, 1359-1361. [ Abstract ]

4. Chung, S. T. L., Legge, G. E., & Cheung, S.-H. (2004). Letter-recognition and reading speed in peripheral vision benefit from perceptual learning. Vision Research 44, 695-709. [ PubMed ]

Conference Presentations

1. Cheung, S.-H., Schuchard, R. A., He, S., Tai, Y., Legge, G. E., & Hu, X. P. (2005, May). Limited retinotopic reorganization in age-related macular degeneration. Poster presented at the Fifth Annual Meeting of the Vision Sciences Society, Sarasota, Florida.

2. Yu, D., Cheung, S.-H., Legge, G. E., & Chung, S. T. L. (2005, May). Changes in the visual span may explain the effect of letter spacing on reading speed. Poster presented at the Fifth Annual Meeting of the Vision Sciences Society, Sarasota, Florida.

3. Cheung, S.-H., McHugh, K., & Legge, G. E. (2005, May). Size and location of the physiological blind spot: Effects of age and target size. Paper presented at the 2005 Annual Meeting of the Association for Research in Vision and Ophthalmology, Ft. Lauderdale, Florida.

4. Kallie, C. S., Cheung, S.-H., Legge, G. E., Owsley, C., & McGwin, G. (2005, May). Nonlinear mixed effects modeling as an estimation procedure for sparse MNREAD data. Poster presented at the 2005 Annual Meeting of the Association for Research in Vision and Ophthalmology, Ft. Lauderdale, Florida.

5. Cheung, S.-H., Legge, G. E., & He, S. (2005, April). Visual cortex reorganization in low vision: A case study. Paper presented at the Vision 2005: the 8th International Conference on Low Vision Activity and Participation, London, United Kingdom.

6. Yu, D., Cheung, S.-H., Legge, G. E., & Chung, S. T. L. (2005, April). Does perceptual learning improve reading speed in peripheral vision of normally sighted older adults? Poster presented at the Vision 2005: the 8th International Conference on Low Vision Activity and Participation, London, United Kingdom.

7. Cheung, S.-H., He, S., Carlson, T., Legge, G. E., & Hu, X. (2003, May). Estimating retinal fixation location using fMRI. Poster presented at the Third Annual Meeting of the Vision Sciences Society, Sarasota, Florida. [ Abstract ]

8. Cheung, S.-H., & Legge, G. E. (2002, July). A new visual field test for estimating non-foveal fixation location and accuracy. Poster presented at the Vision 2002: the 7th International Conference on Low Vision Activity and Participation, Goteborg, Sweden. [ Abstract ]

9. Chung, S. T. L., Legge, G. E., & Cheung, S.-H. (2002, July). Retention of improved letter-recognition accuracy and reading speed in peripheral vision following perceptual learning. Paper presented at the Vision 2002: the 7th International Conference on Low Vision Activity and Participation, Goteborg, Sweden.

10. Cheung, S.-H., & Legge, G. E. (2002, May). Lack of benefit from information across spatial scales in an object recognition task. Poster presented at the Second Annual Meeting of the Vision Sciences Society, Sarasota, Florida. [ Abstract ]

11. Legge, G. E., Lee, H.-W., Owens, D., Cheung, S.-H., & Chung, S. T. L. (2002, May). Visual span: A sensory bottleneck on reading speed. Paper presented at the Third Annual Meeting of the Vision Sciences Society, Sarasota, Florida. [ Abstract ]

12. Cheung, S.-H., & Legge, G. E. (2001, May). Face recognition and object recognition: Different dependence on window size. Poster presented at the 2001 Annual Meeting of the Association for Research in Vision and Ophthalmology (ARVO), Ft. Lauderdale, Florida.

13. Chung, S. T. L., Legge, G. E., & Cheung, S.-H. (2001, May). Letter recognition accuracy and reading speed in peripheral vision benefit from perceptual learning. Paper presented at the 2001 Annual Meeting of the Association for Research in Vision and Ophthalmology (ARVO), Ft. Lauderdale, Florida.

14. Cheung, S.-H., & Legge, G. E. (2000, May). Object recognition: Effects of window size. Poster presented at the 2000 Annual Meeting of the Association for Research in Vision and Ophthalmology (ARVO), Ft. Lauderdale, Florida. *Award-winning

Links

• Research tools

  • Search engine:
    Google Scholar
    PubMed
    Wikipedia, the free encyclopedia

  • Computation:
    MATLAB

    • psignifit Toolbox
    • Psychtoolbox

    Octave

  • Statistics:
    R

  • fMRI data analysis:
    AFNI - Analyses of Functional Neuroimages
    BrainVoyager
    FreeSurfer
    mrGray
    SPM - Statistical Parametric Mapping

• Some useful links

  • Style guide for scientific manuscripts from Denis Pelli

  • Useful numbers in vision science from Brian Wandell

• Collaborators

  • Susana Chung @ University of Houston

  • Sheng He @ University of Minnesota

  • Chris Kallie @ University of Minnesota

  • Gordon Legge @ University of Minnesota

• Photography

  • Pictures taken in Goteborg, Sweden