Researchers in Spain have found that many of the individuals claiming to see the aura of people –traditionally called "healers" or "quacks"– actually present the neuropsychological phenomenon known as "synesthesia" (specifically, "emotional synesthesia"). This might be a scientific explanation of their alleged "virtue". In synesthetes, the brain regions responsible for the processing of each type of sensory stimuli are intensely interconnected. This way, synesthetes can see or taste a sound, feel a taste, or associate people with a particular color.
Read here: http://medicalxpress.com/news/2012-05-scientific-evidence-healers-aura-people.html
Troy Robins - Certified Clinical Hypnotherapist based in Oxford & Witney, Oxfordshire in the UK.