ABSTRACT: The biological origins of meditation in humans remain underexplored, despite extensive scholarship on its cultural history and health effects. We present a theoretical account that traces the origins of meditation to the evolutionarily conserved repertoire of defensive freezing. We propose that this ancient survival response—characterized by motoric immobility, heightened vigilance...
The purpose of this study was to compare the effects of mephedrone and 3,4-methylenedioxy-methamphetamine (MDMA), as reported by young recreational polydrug users. 152 MDMA users and 81 mephedrone users were recruited through snowballing on social network sites. They completed a standard online questionnaire for either mephedrone or MDMA. The questions covered the average amount taken per...