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Education
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Ph.D. Computer Science, University of Minnesota, 1/1997
Academic Appointment, Affiliation, and Employment History
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Assistant Professor, University of Southern California, 1/1/2001-
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Research Associate, NEC Research Institute, 9/1/1998-1/1/2000
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Post-Doctoral Research Fellow, Max-Planck Institute for Biological Cybernetics, Germany, 1/1/1997-8/31/1998
Description of Research
Summary Statement of Research Interests
Professor Tjan studies the human visual system by exploring neural computations that underlie the perception of form, a domain that includes object recognition, scene perception, and reading. He uses a combination of techniques such as computational modeling, psychophysics, and functional Magnetic Resonance Imaging in his research.
On-going research topics (as of 6/2007) include:
- Letter identification and form vision in the peripheral visual fields
- Image enhancement for people with impaired vision
- Indoor navigation aid for the blind and the visually impaired
- Perception of visual speech
- Uncertainty, invariance, and the order of processing in the human visual cortex
- Ocular-motor control during form perception
- Signal-in-noise methods for determining higher-order receptive fields
- Theory of adaptive representation of objects
Affiliations with Research Centers, Labs, and Other Institutions
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Laboratory for Functional and Computational Vision,http://tlab.usc.edu
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Dana and David Dornsife Cognitive Neuroscience Imaging Center,http://brainimaging.usc.edu
Publications
Book Chapter
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Tjan, B. S.
(2002).
Object Recognition. In Arbib M. (Ed.), The Handbook of Brain Theory and Neural Networks. (Vol. 788-792). Object Recognition. In Arbib M. (Ed.), The Handbook of Brain Theory and Neural Networks/Cambridge: MIT Press..
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Klitz, T. S., Legge, G. E., Tjan, B. S.
(2000).
Saccade planning in reading with central scotomas: comparison of human and ideal performance. Reading as a perceptual process./Elsevier.
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Tjan, B. S.
(1996).
Ideal observer analysis of object recognition. Doctoral Thesis. Minneapolis,MN: Ideal observer analysis of object recognition./University of Minnesota.
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Tjan, B. S., Gardiner, D., Slagle, J. R.
(1992).
Representing and reasoning with set referents and numerical quantifiers. Conceptual Structures – current research and practice./Ellis Horwood.
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Gardiner, D., Tjan, B. S., Slagle, J. R.
(1992).
Extending Conceptual Structures: Representation Issues and Reasoning Operations. Conceptual Structures – current research and practice./Ellis Horwood.
Journal Article
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Nandy, A. S., Tjan, B. S.
(2007).
The nature of letter crowding as revealed by first- and second-order classification images. Journal of Vision.
Vol. 7(2), pp. 5, 1–26.
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Huang, X., Lu, H., Tjan, B. S., Zhou, Y., Liu, Z.
(2007).
Motion perceptual learning: When only task-relevant information is learned. J Vis.
Vol. 7, pp. 14 1-10.
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Chung, S. T., Tjan, B. S.
(2007).
Shift in spatial scale in identifying crowded letters. Vision Res.
Vol. 47, pp. 437-51.
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Yue, X., Tjan, B. S., Biederman, I.
(2006).
What makes faces special?. Vision Res.
Vol. 46, pp. 3802-11.
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Tjan, B. S., Nandy, A. S.
(2006).
Classification images with uncertainty. J Vis.
Vol. 6, pp. 387-413.
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Tjan, B. S., Lestou, V., Kourtzi, Z.
(2006).
Uncertainty and invariance in the human visual cortex. J Neurophysiol.
Vol. 96, pp. 1556-68.
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Lu, H., Tjan, B. S., Liu, Z.
(2006).
Shape recognition alters sensitivity in stereoscopic depth discrimination. J Vis.
Vol. 6, pp. 75-86.
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Tjan, B. S., Liu, Z.
(2005).
Symmetry impedes symmetry discrimination. J Vis.
Vol. 5, pp. 888-900.
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Chung, S. T., Levi, D. M., Tjan, B. S.
(2005).
Learning letter identification in peripheral vision. Vision Res.
Vol. 45, pp. 1399-412.
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Christou, C. G., Tjan, B. S., Bulthoff, H. H.
(2003).
Extrinsic cues aid shape recognition from novel viewpoints. J Vis.
Vol. 3, pp. 183-98.
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Legge, G. E., Hooven, T. A., Klitz, T. S., Stephen Mansfield, J. S., Tjan, B. S.
(2002).
Mr. Chips 2002: new insights from an ideal-observer model of reading. Vision Res.
Vol. 42, pp. 2219-234.
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Chung, S. T., Legge, G. E., Tjan, B. S.
(2002).
Spatial-frequency characteristics of letter identification in central and peripheral vision. Vision Res.
Vol. 42, pp. 2137-152.
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Chung, S. T., Levi, D. M., Legge, G. E., Tjan, B. S.
(2002).
Spatial-frequency properties of letter identification in amblyopia. Vision Res.
Vol. 42, pp. 1571-81.
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Tjan, B. S.
(2001).
Adaptive object representation with hierarchically-distributed memory sites. Advances in Neural Information Processing Systems.
Vol. 13, pp. 66-72.
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Newell, F. N., Ernst, M. O., Tjan, B. S., Bulthoff, H. H.
(2001).
Viewpoint dependence in visual and haptic object recognition. Psychol Sci.
Vol. 12, pp. 37-42.
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Tjan, B. S., Ruppertsberg, A. I.
(2001).
The pew illusion--a real-world example of misperceived slant. Perception.
Vol. 30, pp. 125-8.
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Tjan, B. S., Legge, G. E.
(1998).
The viewpoint complexity of an object-recognition task. Vision Res.
Vol. 38, pp. 2335-50.
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Legge, G. E., Klitz, T. S., Tjan, B. S.
(1997).
Mr. Chips: an ideal-observer model of reading. Psychol Rev.
Vol. 104, pp. 524-53.
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Dogru, S., Rajan, V., Rieck, k., Slagle, J. R., Tjan, B. S., Wang, Y.
(1996).
A graphical data flow language for retrieval, analysis, and visualization. Journal of Visual Languages and Computing.
Vol. 7, pp. 247-265..
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Tjan, B. S., Braje, W. L., Legge, G. E., Kersten, D.
(1995).
Human efficiency for recognizing 3-D objects in luminance noise. Vision Res.
Vol. 35, pp. 3053-69.
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Braje, W. L., Tjan, B. S., Legge, G. E.
(1995).
Human efficiency for recognizing and detecting low-pass filtered objects. Vision Res.
Vol. 35, pp. 2955-66.
Proceedings
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Tjan, B. S., Beckmann, P., Roy, R., Giudice, N., Legge, G. E.
(2005).
Digital Sign System for indoor wayfinding for the visually impaired. Washington, DC, USA. Digital Sign System for indoor wayfinding for the visually impaired./IEEE Computer Society.
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