The case study, reported in the October issue of Cognitive Neuropsychology, shows how some people can experience colours in response to people they know or words that evoke emotions a condition known as emotion-colour synaesthesia.
Dr Jamie Ward, author of the study, says: "A popular notion is that some people have a magical ability to detect the hidden emotions of others by seeing a colourful 'aura' or energy field that they give off. Our study suggests a different interpretation. These colours do not reflect hidden energies being given off by other people, rather they are created entirely in the brain of the beholder."
In the study, Dr Ward of UCL's Psychology Department documented a woman known as GW who could see colours like purple and blue in response to people she knew or their names when read to her. Words triggered a colour which spread across her whole field of vision, whilst people themselves appeared to have coloured 'auras' projected around them. For example, "James" triggered pink, "Thomas" black and "Hannah" blue.
A similar test using 100 words rated on a scale of 1 to 7 for their emotional impact showed that highly emotive words such as fear or hate also triggered colours. Words associated with positive emotions tended to elicit pink, orange, yellow, and green, whereas words associated with negative emotions triggered brown, grey, and black.
Whilst it is quite common to describe people or emotions metaphorically in terms of colours, GW actually reported vividly seeing them. Indeed, when "James" (a pink word) was written in the wrong colour (e.g. blue), her reaction times were slowed.