School of Life Sciences


Cognitive Neuroscience Seminar (CNI) - Short science/methods presentations - Lucy Somers

Tuesday 27 October 13:00 until 14:00
Online format, Zoom Link:
Speaker: Lucy Somers
Part of the series: Cognitive Neuroscience and Imaging (CNI)

Abstract: Steady State Visually Evoked Potentials are electrical amplitudes measured from cortical populations responding to a flashing stimulus at a unique frequency. The frequency tagged activity gives an indication of the neural activity involved in stimulus selective networks.
The chromatic pathway of the human visual system involves integrating information from three cone types, long-, medium- and short- wavelength sensitive cones. The blue-sensitive S-cones are outnumbered in the retina 100 to 1 by the L and M cones and it is unclear how they contribute equally to our perception of colour. We compare SSVEP amplitudes measured from the retina with electrodes placed close to the eye, and amplitudes measured from the early visual cortex from occipital electrodes, in order to study how the s-cone signal is scaled at successive stages of visual processing.
This talk will present an introduction and overview of the SSVEP method and discuss ongoing research studying fundamental mechanisms of colour vision in both individuals with normal colour vision and mildly colour-deficient observers.

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By: Chris Racey
Last updated: Thursday, 10 September 2020