T: +44 141 331 3007
F: +44 (0)141 331 3387
My background includes a doctorate in physics (thesis title: "Frozen and broken color: A matrix Schroedinger equation in the semiclassical limit") and postdocs in neurobiology and psychophysics. My research focus is to use the models and quantitative techniques used in research on "front-end" vision to probe successively higher order sensory and cognitive processes. Immediate general areas of interest include investigating pattern vision, motion vision, and visual memory. I've been particularly interested in phenomena which illuminate the nature of the visual percept (including peripheral pattern perception, change blindness and inattentional blindness) and more general visual tasks, posing fundamental theoretical questions, depending on non-local computations involving more than one feature.
Henderson, R.M., & Orbach, H.S. (2006). Is there a mismatch negativity during change blindness? Neuroreport, 17 (10), 1011-1015.
Kennedy, G.J., Orbach, H.S., & Loffler, G. (2006). Effects of global shape on angle discrimination. Vision Res, 46 (8-9), 1530-1539.
Orbach, H.S. , Jackson, M. R., Henderson, R.M. and O. Kehemetswe (2004) Inattentional blindness for psychophysicists: Orientation discrimination thresholds for miscued heterogeneous patterns. Journal of Vision (in press).
Loffler, G., & Orbach, H.S. (2003). Modeling the integration of motion signals across space. J Opt Soc Am A Opt Image Sci Vis, 20 (8), 1472-1489.
Loffler, G., & Orbach, H.S. (2003). Factors affecting motion integration. J Opt Soc Am A Opt Image Sci Vis, 20 (8), 1461-1471.
Loffler, G. and H.S. Orbach (2003) Modelling the integration of motion signals across space. J. Opt. Soc. America, A, 20: 1472-1489.
Loffler, G. and H.S. Orbach (2003) Factors affecting motion integration. J. Opt. Soc. America, A, 20: 1461-1471.
Orbach, H.S. and R.M. Henderson (2003) Are there event-related potential (ERP) correlates of implicit change detection? A miscuing paradigm. Journal of Vision (3:588a).
Henderson, R.M., Baker, M.R., Manahilov, V., McLachlan, R.C., Grant, N.S.K., Findlay, K., Day, M.McL., Grimstone, L., McCulloch, D.L., and H.S. Orbach, (2002) Are there event-related potentials (ERPs) to change during 'change blindness'? Perception (31:77-78).
Loffler, G, Kennedy, G, Orbach, H.S. and G.G. Gordon, (2003) Properties of static and dynamic angle discrimination are different. Journal of Vision (3:795a)
Orbach, H.S., Henderson, R.M. and M.R. Baker (2002) Signal detection theory and implict representation. Journal of Vision, 2:18a
Loffler, G., & Orbach, H.S. (2001). Anisotropy in judging the absolute direction of motion. Vision Res, 41 (27), 3677-3692.
Scott-Brown, K.C., Baker, M.R., and H.S. Orbach (2000) Comparison blindness. Visual Cognition, 7: 254-267.
McCulloch, D.L., Orbach, H. and B. Skarf (1999) Maturation of the pattern reversal VEP in human infants: a theoretical framework. Vision Research, 39: 3673-3680.
Orbach, H.S. and H.R. Wilson (1999). Factors limiting peripheral pattern discrimination. Spatial Vision, 12:83-106.
Loffler, G. and H.S. Orbach (1999) Computing feature motion without feature detectors: A model for terminator motion without end-stopped cells Vision Research, 39:859-871.
Scott-Brown, K.C. and H.S. Orbach (1998) Contrast discrimination, non-uniform patterns and change blindness. Proceedings of the Royal Society, B, 265:2159-2166.
EPSRC Research Grant
Glasgow Caledonian University £60,000
Glasgow Caledonian Univ. Sustaining Current Initiatives Award
Glasgow Caledonian University £40,000
Wellcome Trust Undergraduate Vacation Fellowship Grants
Glasgow Caledonian University £6,000
Nuffield Foundation Undergraduate Research Bursary
Glasgow Caledonian University £1,000
Carnegie Trust Undergraduate Vacation Fellowship Grant
Glasgow Caledonian University £400
Royal Society Conference Grant
Glasgow Caledonian University £800
Caltech/JPL President's Fund (co-investigator)
California Institute of Technology £35,000
Markey Internal Grant in Developmental Biology (co-investigator)
California Institute of Technology £55,000
Individual National Research Service Award
Yale University and Caltech £15,000