Our group conducts basic research into the mechanisms underlying normal adult human perception. We also seek to explore potential applications of our findings - for example, in developing new display technologies and in understanding limitations of vision in disease.
BA (Hons) PhD
Associate Professor of Experimental Psychology
- Tutorial Fellow, Pembroke College
My research focuses on the neural mechanisms that underlie perception.
I am fascinated by how the eye and brain process visual information. My research addresses this question primarily through psychophysical experiments - inferring the perceptual processes that underly particular patterns of human performance on tasks with carefully selected visual stimuli.
I am particularly interested in the perception of colour. How are the signals from the three classes of cone photoreceptors processed to give rise to our perceptions of hue, saturation and brightness? What are the neural circuits of comparison and combination that permit the efficient transmission of colour information from retina to cortex? How does our perception of colour depend on our ability to identify objects and light sources in the visual scene? I am also interested in the way in which our visual systems process rapid sequences of visual events – a sequence of changes in illumination, a sequence of images from successive fixations, or the complex trajectory of a moving object.
Are hue and saturation carried in different neural channels?
Regan SE. et al, (2018), J opt soc am a opt image sci vis, 35, B299 - B308
Discrimination of spectral reflectance under environmental illumination.
Morimoto T. and Smithson HE., (2018), J opt soc am a opt image sci vis, 35, B244 - B255
Translucence perception is not dependent on cortical areas critical for processing colour or texture.
Chadwick AC. et al, (2017), Neuropsychologia
Motion of glossy objects does not promote separation of lighting and surface colour.
Lee RJ. and Smithson HE., (2017), R soc open sci, 4
Bow-shaped caustics from conical prisms: a 13th-century account of rainbow formation from Robert Grosseteste's De iride.
Harvey JS. et al, (2017), Appl opt, 56, G197 - G204
A major focus of my current research is to develop an adaptive optics enabled ophthalmoscope to capture images of the retina with high fidelity and to present visual stimuli targeted to particular elements of the retinal microstructure. Our aim is to link stimulation, neural activity and perceptual experience to answer such questions as "How do the neural circuits in human retina adapt to maintain sensitivity across the vast range of environmental light levels?"