Spirituality underlies scientific researches form the side of neurology which measured changes of brain(better: head-skin)-waves during meditations and breath-exercises. At the same time, of course, spirituality was 'scientific' reduced to a neural level. So exercises of spirituality were abused for modern life to reduce stress.
The TM-Meditation is a simple Mantra-Meditation. The connection of alpha-waves and coherence of brainwaves with samadhi is unproven and not probable. The flying-siddhis were never proven.== Literature ==