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Harry Orbach

Department of Vision Sciences
Glasgow Caledonian University
Cowcaddens Road
Glasgow, G4 0BA
Scotland, UK
Office phone: +44 (0)141 331 3007
Office fax: +44 (0)141 331 3387

Email: h.orbach@gcal.ac.uk
Home page: http://fhis.gcal.ac.uk/VS/harry.html




Change Detection Research Interests
My research, done in collaboration with Kenneth C. Scott-Brown and Mark R. Baker, has introduced quantitative techniques into the study of change blindness, using simple stimuli to measure our capacity for detecting changes and for isolating the causes of change blindness. Using these techniques, we have found challenges to popular psychological and psychophysical explanations. Our results argue against sparse, abstract, coding as the cause for change blindness but also argue against previously successful spatial attention explanations.. In a later study, we further restricted the possible explanations for change blindness by explicitly investigating the role of memory. By its very name, change blindness suggests a limitation in comparisons made over time which thus suggests explanations due to memory limitations. However, we observed similar limitations in comparing patterns presented simultaneously, within a single fixation, where memory would not be a factor.

Other Research Interests
Pattern vision, motion vision, visual memory and visual cognition


Change Detection Publications
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.

Scott-Brown, K.C., Baker, M.R., and H.S. Orbach (2000) Comparison blindness. Visual Cognition, 7: 254-267.




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