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Steph Acaster

Steph Acaster

Behavioural and electrophysiological indices of the perceptual phenomena of contrast and assimilation


Discipline/professional area

Outline of research project

This research aims to provide further insight into the apparently opposite perceptual phenomena of colour contrast and assimilation, using electrophysiological measures alongside behavioural measures. Simple visual stimuli will be used to explore the event-related potentials (ERPs) associated with contrast and assimilation, in order to identify similarities and differences between the two phenomena, revealing more information about how, when and why contrast and assimilation occur. By varying physical attributes of the stimuli such as size, spatial frequency, and depth, a more detailed account of context-dependent changes in the visual perception of lightness will emerge.

Key references

McCourt, M. E., and Foxe, J. J. (2004). Brightening prospects for early cortical coding of perceived luminance: a high-density electrical mapping study. Neuroreport, 15(1), 49-56.

Soranzo A., Galmonte A. and Agostini T. (2010). von Bezold effect reverses under stereoscopic conditions. Perception, 39.

Director of studies
Dr Naira Taroyan

Dr John Reidy
Dr Alessandro Soranzo

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