Basic and Applied Neurosciences
Centre for Vision and Hearing Research(CVHR)
Experimental research & computational modelling of the mechanisms and processes of human visual perception, especially spatial vision, binocular vision and motion perception. Previously funded by project grants from the BBSRC and EPSRC (awarded jointly with Prof. Tim Meese), now funded by a Leverhulme Trust Emeritus Fellowship.
Former Committee member & Chair of the Applied Vision Association (AVA), 2002-2013 Editorial boards of Vision Research (2000-2008), Perception (1998-2016) and Journal of Vision (2003-2017).
Leverhulme Trust Emeritus Research Fellow (2017-2019)
Visiting Professor, University of Nottingham (2015 - 2021)
Visiting Senior Research Fellow, University of Plymouth (2018 - 2021)
Formerly Adjunct Professor, Dept. of Ophthalmology, McGill University, Montreal, Canada (2014 - 2017)
Research PublicationsLab Notes & Software for Visual PsychophysicsNews & Views EPSRC grant S07261/01: Final report & manuscripts Vision Science Demos ::: The motion aftereffect without motion 
Mark Georgeson was educated at Preston Catholic College and Cambridge University where he studied Mathematics and Experimental Psychology (B.A. 1970). He worked on a variety of topics in spatial vision at Sussex University (D.Phil. 1975), then took up a lectureship at the University of Bristol (1976), moved on to Aston University (Birmingham, UK) as Reader in Vision Sciences (1991), then to Birmingham University as Professor of Psychology (1995). In 2001, he moved back to Aston as Professor of Vision Sciences. He has published more than 90 papers on research topics in human vision, especially on spatio-temporal filtering operations and coding processes in spatial vision, motion perception and binocular vision. He is co-author (with Bruce & Green) of the widely used textbook Visual Perception: Physiology, Psychology & Ecology (1996, 2003). With Prof. Tim Meese, he was funded by research grants from UK research councils (EPSRC, BBSRC) to study spatial vision and binocular vision, and was previously funded by the Wolfson Foundation and the Wellcome Trust amongst others. He has been an active supporter and promoter of vision research in the UK Applied Vision Association (Chairman 2005-8), and on the editorial boards of Vision Research (2000-2008), Ophthalmic & Physiological Optics (2007-2010), Perception (1998-2016), and Journal of Vision (2003-2017).
Bruce V, Green P R, Georgeson M A (1996) Visual Perception: Physiology, Psychology and Ecology, 3rd edition. Hove & London: Psychology Press. pp.448.
Bruce V, Green P R, Georgeson M A (2003) Visual Perception: Physiology, Psychology and Ecology, 4th edition. Hove & London: Psychology Press.
Four decades of spatial frequency channels: a scale-space view of spatial vision An invited talk to the Craik Club, University of Cambridge, April 2008 http://www.crsltd.com/georgeson
88. Zhou J, Georgeson MA, Hess RF (2014). Linear binocular combination of responses to contrast modulation: contrast-weighted summation in first- and second-order vision. Journal of Vision 14(13):24, 1-19.
83. Wallis SA, Georgeson MA (2012) Mach bands and multiscale models of spatial vision: the role of 1st, 2nd and 3rd derivative operators in encoding bars and edges. Journal of Vision, 12(13):18, 1-25. http://www.journalofvision.org/12/13/18
82. Baker DH, Wallis SA, Georgeson MA, Meese TS (2012). The Effect of Interocular Phase Difference on Perceived Contrast. PloS ONE, 7(4), 1-6. Download PDF
81. Baker DH, Wallis SA, Georgeson MA, Meese TS (2012). Nonlinearities in the binocular combination of luminance and contrast. Vision Research 56, 1-9.
80. Schofield A J, Rock P B,Georgeson M A (2011) Sun and sky: Does human vision assume a mixture of point and diffuse illumination when interpreting shape-from-shading? Vision Research 51, 2317-2330.
79. Elliott SL, Georgeson MA, Webster, MA (2011). Response normalization and blur adaptation: data and multi-scale model. Journal of Vision 11(2):7, 1-18. http://journalofvision.org/11/2/7/
78. Schofield A J, Rock P B, Sun P, Jiang X, Georgeson M A (2010) What is second-order vision for? Discriminating illumination versus material changes. Journal of Vision 10(9):2, 1-18. http://journalofvision.org/10/9/2/
66. Georgeson M A, Lampard J, Georgeson J M (2005) Kits, colours and confusion: a pilot study of vision and football. Perception 34, 633-637. 65. Hesse G S, Georgeson M A (2005) Edges and Bars: where do people see features in 1-D images? Vision Research. 45, 507-525.
64. Cooper ACG, Humphreys GW, Hulleman J, Praamstra P & Georgeson MA (2004) Trans-cranial magnetic stimulation (TMS) to right parietal cortex modifies attentional blink. Experimental Brain Research 155, 24-29.
63. Hammett S T, Georgeson M A, Barbieri-Hesse, GS (2003) Motion, flash and flicker: a unified spatio-temporal model of edge sharpening Perception 32, 1221-1232.
1. Gamma correction and CRT calibration (2006) 2. On making visual noise (1999, 2003) 3. Measuring the crosstalk in stereo goggles (2005)
4. Lecture Notes: Signal Detection Theory - Introduction (1999-2006) 5. Lecture Notes: Signal Detection Theory & Psychophysics (2006)6. Research Seminar: Using psychophysics to study perception (2007) [ A talk on Signal Detection Theory and the single-interval psychometric function] 7. Download Excel file for SDT calculations: Yes-No and 2AFC (2006) Note: This file is supplied 'as is', for information & guidance only. I cannot undertake to support its use, nor can I guarantee that it is appropriate for your application
PsychToolbox - free Matlab software for visual psychophysics on Mac & PC Psignifit - free software for fitting psychometric functions to data CRS Ltd - commercial equipment & software for vision research NIH Image - free software for digital image-processing
1. Perception & Action - You ain't seen nothin' yet (Perception 1997) 2. Visual aftereffects - cortical neurons change their tune (Current Biology 2004)
Final report – Summary of work on the project R1. Depth propagation & Surface contruction: Georgeson et al (2007) R2. Depth facilitation & Uncertainty: Georgeson et al (2007) R3. Is there a sun? Probing the default illuminant for human shape-from-shading: Schofield et al (2007) R4. Analysis of shading versus material changes in images: Schofield et al (2007) R5. Technical Report: Greyscale CRT calibration for psychophysics: Georgeson (2007)
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The motion aftereffect (MAE) is well known. Staring for a few seconds at motion in one direction (eg clockwise) will make a stationary test pattern appear to move the opposite way (eg anti-clockwise). The effect is compelling, and involves a temporary change in the responsiveness of motion-detecting cells in the visual parts of the brain. It is used by vision scientists as a research tool, to study how visual motion perception works. Much less well-known is the finding that adapting to flickering images that are not moving can also produce an MAE - the 'motion aftereffect without motion' (Anstis, 1990, Perception 19, 301-306). Recently I discovered how to generalize this effect to produce motion in any arbitrary test image, in any direction. The effect most probably involves adapting cells in the retina, not the brain, that sense the way local image brightness changes over time. These cells then feed into the computation of motion by the brain. Four videos of this effect are given below. Enjoy!
Instructions for the Demos Click play (>). Fix your gaze steadily & carefully on the central letter (A, becomes T, then B) 1. Adapt for 4 sec; the image is flickering but not moving. 2. Test: stationary patterns; do they seem to move? In what way? 3. Blank frames: there's no test image at all, but do you see moving images? [ If not sure, try again...all four demos are different. Try to keep your gaze fixed on the letter(s) ]
Last update: 24 Jan 2017, 1.42 p.m.
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