MEDITATION is fast becoming a fashionable tool for improving your mind. With mounting scientific evidence that the practice can enhance creativity, memory and scores on standardized intelligence tests, interest in its practical benefits is growing. A number of “mindfulness” training programs, like that developed by the engineer Chade-Meng Tan at Google, and conferences like Wisdom 2.0 for business and tech leaders, promise attendees insight into how meditation can be used to augment individual performance, leadership and productivity.