These conclusions were gathered from a self-reported study of what people think are 'restful activities'. I would hardly consider the title an accurate conclus

These conclusions were gathered from a self-reported study of what people think are 'restful activities'. I would hardly consider the title an accurate conclusion to make. It is entirely possible that extroverts (or anyone in the survey, for that matter) picked activities that are seen as peaceful or calming by society as a whole.