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In the introduction, we derived one general prediction for beginning and intermediate practitioners of meditation from both the Hindu and Buddhist approaches (meditation yields generally positive psychological effects), but we did not deal with predictions that refer to advanced or final stages in the meditation practice. Here is such a prediction. Both Hindu and Buddhist approaches hold that practitioners of meditation might develop a kind of supercognition, special abilities (siddhis) that exceed our normal abilities. Buddhist theory predicts that six kinds of siddhis might arise.… Notably, the least spectacular one, destruction of the defiling impulses, is seen as the most significant. The others are psychokinesis, clairaudience, telepathic knowledge, retrocognitive knowledge …, and clairvoyance. The Yoga Sutras report more of these siddhis as a result of extended yoga practice. In both the Hindu and Buddhist approaches, siddhis are not regarded as very important, and the Buddha, as well as famous yogis, has warned of the dangers inherent in the siddhis.… Nonetheless, a theory about the effects of meditation would not be complete without consideration of these altered states of consciousness. There is some evidence that such states can occur spontaneously …, but the effects found in meta-analyses are usually quite small.… To the best of our knowledge, nobody has yet examined whether the respective effects are more pronounced for experienced practitioners of meditation, as both the Hindu and Buddhist approaches would predict
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Dean Radin (Supernormal: Science, Yoga and the Evidence for Extraordinary Psychic Abilities)