Additive Effects of 3,4-Methylenedioxymethamphetamine (MDMA) and Compassionate Imagery on Self-Compassion in Recreational Users of Ecstasy

Introduction

Ecstasy (street MDMA) is widely used recreationally and has well-documented prosocial subjective effects, including heightened interpersonal understanding and compassion. Controlled laboratory work with MDMA has reported increases in emotional empathy and reductions in some aspects of cognitive empathy, and a number of neurobiological mechanisms have been proposed to explain these effects, notably MDMA-induced increases in central oxytocin. Behavioural strategies aimed at increasing self-directed affiliation, such as compassionate imagery (CI) drawn from compassion-focused therapy, can produce similar changes in self-attitudes, but individual differences (for example, fear of compassion or insecure attachment) can limit their effectiveness. Kamboj and colleagues note prior naturalistic findings suggesting that ecstasy and CI can both increase state self-compassion and that their effects may summate, but emphasise that earlier work did not chemically verify ecstasy composition and so could have been influenced by adulterants or by uncontrolled aspects of "set and setting". This study set out to replicate and extend previous naturalistic findings while chemically verifying participants' self-sourced ecstasy. The main hypotheses were that recreational MDMA use and CI would each increase state self-compassion and reduce self-criticism, and that combined administration (MDMA + CI) would produce additive effects on these self-attitudes. A secondary prediction was that MDMA would enhance emotional arousal in response to compassionate facial expressions, assessed using an emotional empathy task with both basic (anger, happiness) and complex (criticism, compassion) facial stimuli. The investigators emphasised that confirming MDMA content of participants' tablets would allow clearer attribution of observed effects to MDMA itself.