Dr Stuart Wallis, BSc, PhD, CSci, FHEA

Stuart Wallis image
Dr Stuart Wallis
Research Fellow
School of Life and Health Sciences
Aston University
B4 7ET

Email: s.a.wallis2 [at] aston.ac.uk
Phone: +44 (0)121 204 5171

Career History

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. That contract expired at the end of September 2012. Stuart then worked as a Sessional Lecturer, teaching Research Methods and Statistics, and Auditory Perception. Stuart is now employed as a Research Fellow on the ARCHA ExtraCare project.

Research Interests

  • Spatial vision
  • Binocular vision
  • Psychophysical methods
  • Computational modelling
  • Module design

Teaching responsibilities

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

Published papers

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.

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. pdf.

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. & 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

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.

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.

Last updated: 10 March 2014

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