Enhanced self-reported affect and prosocial behaviour without differential physiological responses in mirror-sensory synaesthesia. (21st October 2019)

• Record Type: Journal Article
• Authors: Ioumpa, Kalliopi; Graham, Sarah A.; Clausner, Tommy; Fisher, Simon E.; van Lier, Rob; van Leeuwen, Tessa M.
• Is Part Of: Philosophical transactions. Volume 374:Number 1787(2019)
• Publication Date: 2019-10-21
• Subjects: mirror-touch synaesthesia -- mirror-pain synaesthesia -- empathy -- altruism -- stress response -- prosocial behaviour; Biology -- Periodicals; Science -- Periodicals; 570
• DOI: 10.1098/rstb.2019.0395
• Languages: English
• ISSNs: 0962-8436

Abstract

Abstract : Mirror-sensory synaesthetes mirror the pain or touch that they observe in other people on their own bodies. This type of synaesthesia has been associated with enhanced empathy. We investigated whether the enhanced empathy of people with mirror-sensory synesthesia influences the experience of situations involving touch or pain and whether it affects their prosocial decision making. Mirror-sensory synaesthetes ( N = 18, all female), verified with a touch-interference paradigm, were compared with a similar number of age-matched control individuals (all female). Participants viewed arousing images depicting pain or touch; we recorded subjective valence and arousal ratings, and physiological responses, hypothesizing more extreme reactions in synaesthetes. The subjective impact of positive and negative images was stronger in synaesthetes than in control participants; the stronger the reported synaesthesia, the more extreme the picture ratings. However, there was no evidence for differential physiological or hormonal responses to arousing pictures. Prosocial decision making was assessed with an economic game assessing altruism, in which participants had to divide money between themselves and a second player. Mirror-sensory synaesthetes donated more money than non-synaesthetes, showing enhanced prosocial behaviour, and also scored higher on the Interpersonal Reactivity Index as a measure of empathy. Our study demonstrates the subjective impact of mirror-sensory synaesthesia and its stimulating influence on prosocial behaviour. This article is part of the discussion meeting issue 'Bridging senses: novel insights from synaesthesia'.