By Laura Fabri
Egocentric, self-centred, and insensitive to the needs of others: these social problems often arise in people with severe traumatic brain injury (TBI) and have been attributed in part to a loss of emotional empathy, the capacity to recognise and understand the emotions of other people. Given that traumatic brain injuries are becoming more common, and resulting empathy deficits can have negative repercussions on social functioning and quality of life, it is increasingly important to understand the processes that shape emotional empathy. A new study has recently revealed evidence of a relationship between physiological responses to anger and a reduction of emotional empathy post-injury, as reported in the May 2011 issue of Elsevier’s Cortex (http://www.sciencedirect.com/science/journal/00109452).
Researchers from the University of New South Wales, Australia, teamed up to investigate whether physiological responses to emotions correlate with emotional empathy in a group of adults with severe TBI and a group of healthy control participants. After determining the emotional empathy abilities of the participants by questionnaire, the researchers measured activation of their facial muscles and sweat glands, in response to happy and angry facial expressions, using facial electromyography (EMG) and skin conductance. They found that the control group spontaneously mimicked the emotional facial expressions they saw, and also perspired more in response to angry faces. In contrast, those in the TBI group generally scored lower in emotional empathy and were less responsive, specifically to angry faces. Lack of emotional empathy was specifically found to be associated with reduced physiological responses to angry faces.