Stuart graduated with a BSc (Hons) in Psychology in 1987 at Birmingham University. He then spent several years in the Civil Service, working for the Lord Chancellor's Department. Desiring a change of career, he completed a 2nd undergraduate degree, and graduated with a first class BSc (Hons) in Optometry at Aston University in 2005. He then completed a PhD in Vision Science under the supervision of Professor Mark Georgeson, at Aston University. His thesis was submitted in 2009 and was on 'Low level feature detection in human vision'. He was then employed as the named post-doctoral researcher on BBSRC grant number BBH00159X1, working on binocular fusion and diplopia in human vision. Stuart then worked as a Sessional Lecturer, teaching Research Methods and Statistics, and Auditory Perception, followed by a year as a Research Fellow on the ARCHA ExtraCare project
. Current employment is as a Research Fellow on a 2-year project that aims to improve the reading ability of a cohort of Macular Degeneration patients.
Learning & Teaching Champion for the School of Life & Health Sciences, 2011-2012
Sessional lecturer for the following modules:
- Research Methods - 2nd year MSc, 2012-13
- Vision & Visual Perception - 1st year BSc, 2011-12
- Research methods and statistics - 2nd year BSc, 2008-2012
- Auditory perception - 2nd year BSc, 2008-2012
- Auditory perception - 2nd year Foundation Degree, 2008-2013
- Dissertation (statistics, SPSS, research methods) - 4th year BSc, 2009-2013
Georgeson, M.A. & Wallis, S.A. (2014) Binocular fusion, suppression and diplopia for blurred edges. Ophthalmic and Physiological Optics
, 34 163-185. doi: 10.1111/opo.12108. article
Wallis, S.A., Baker, D.H., Meese, T.S. & Georgeson, M.A. (2013) The slope of the psychometric function and non-stationarity of thresholds in spatiotemporal contrast vision. Vision Research, 76, 1-10. doi: 10.1016/j.visres.2012.09.019. article.
Wallis, S.A. & Georgeson, M.A. (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)10.1167/.12.13.18. pdf.
Baker, D.H., Wallis, S.A., Georgeson, M.A. & Meese, T.S. (2012) The effect of interocular phase difference on perceived contrast. PLoS ONE, 7(4): e34696. doi:10.1371/journal.pone.0034696.
Baker, D.H., Wallis, S.A., Georgeson, M.A. & Meese, T.S. (2012) Nonlinearities in the binocular combination of luminance and contrast. Vision Research, 56, 1-9. AURA pdf
Wallis, S. A. & Georgeson, M. A. (2009) Mach edges: Local features predicted by 3rd derivative spatial filtering, Vision Research
49, 1886-1893. AURA pdf
Meese, T. S., Summers, R. J., Holmes, D. J., & Wallis, S. A. (2007). Contextual modulation involves suppression and facilitation from the center and the surround. Journal of Vision, 7(4):7, 1-21, http://journalofvision.org/7/4/7/, doi:10.1167/7.4.7.
Published conference abstracts
Georgeson, M., Meese, T., Baker, D. & Wallis, S. (2014). Binocular summation: what is the fate of monocular signals? Perception 43 (10), 1117.
Georgeson, M. & Wallis, S. (2012) Mach bands and models of spatial vision: the role of 1st, 2nd and 3rd derivative operators in encoding edges and bars. Journal of Vision, 12(9), 319. doi: 10.1167/12.9.319
Georgeson, M.A. & Wallis, S.A. (2012). Nonlinear binocular summation and interocular suppression implement binocular fusion: a unification of two models, Perception 41 (Supplement), 116.
Wallis, S. & Georgeson, M. (2012) What is binocular fusion? Multiplicative combination of luminance gradients via the geometric mean. Journal of Vision, 12(9), 47. doi: 10.1167/12.9.47
Wallis S. & Georgeson M. (2012). What is binocular fusion? i-Perception 3 (4), 220.
Wallis, S. & Georgeson, M. (2012) Binocular fusion, suppression and diplopia: scale invariance and the influence of a contrast imbalance between the eyes. Ophthalmic and Physiological Optics, 32 (2). 171-172.
Baker, D., Wallis, S., Georgeson, M. & Meese, T. (2012). Interocular phase difference does affect perceived contrast. Perception 41 (3), 366.
Wallis, S.A. & Georgeson, M.A. (2011). The scale dependence of binocular fusion, suppression and diplopia, Perception 40 (1), 115.
Baker, D.H., Georgeson, M.A., Wallis, S.A. & Meese, T.S. (2010). Difference between target and background luminance determines the rule for binocular combination, Perception
39 (8), 1149.
Wallis, S.A. & Georgeson, M.A. (2010). Mach Bands: multi-scale spatial filtering and co-operative coding of edges and bars, Perception
39 (2), 272.
Georgeson, M., & Wallis, S. (2008). Seeing light vs dark lines: psychophysical performance is based on separate channels, limited by noise and uncertainty. Journal of Vision
, 8(6):821, 821a, http://journalofvision.org/8/6/821/, doi:10.1167/8.6.821
Wallis, S.A. & Georgeson, M.A. (2008). Seeing light vs dark lines: Psychophysical performance is based on separate channels, limited by noise and uncertainty, Perception 37 (2), 315.
Wallis, S.A. & Georgeson, M.A. (2007). Third-derivative filters predict edge locations in spatial vision, Perception 36 (Supplement), 43.
Wallis, S.A. & Georgeson, M.A. (2007). Mach edges: A critical test of the nonlinear 3rd derivative model for edge detection, Perception 36 (9), 1409-1410.
Wallis, S.A. & Georgeson, M.A. (2007). Mach Edges: a key role for 3rd derivative filters in spatial vision, Perception 36 (2), 314-315.
Meese, T.S., Holmes, D.J., Summers, R.J. & Wallis, S.A. (2006). Cross-orientation suppression is not scale-invariant in space or time. Perception 35 (3), 417.