bibliography. (2010). http://science.jrank.org / pages/7857/Meditation-Eastern.html.
Many religious traditions have practices that could possibly be labeled meditation. In Judaism, Christianity, and Islam, these practices are usually associated with prayer, contemplation, or recitation of sacred texts. In the religious traditions of the Native Americans, Australian aboriginals, Siberian peoples, and many others, what could be identified as meditation techniques are incorporated within the larger rubric of shamanism. It is, however, in the religions of Asia that meditation has been most developed as a religious method.
Meditation has played an important role in the ancient yogic traditions of Hinduism and also in more recent Hindu-based new religious movements such as Maharishi Mahesh Yogi's Transcendental Meditation program. But it is most especially in the monastic or "elite" forms of the various traditions of Buddhism (Theravada, Tibetan/Vajrayana, and Ch'an/Zen) that meditation techniques have taken center stage and have been developed to the highest degree of sophistication and complexity.
Short-Term Effects of Meditation vs. Relaxation on Cognitive Functioning. Contributors: Gillian King - author, Jeffrey Coney - author. Journal Title: Journal of Transpersonal Psychology. Volume: 38. Issue: 2. Publication Year: 2006. Page Number: 200+.
Authors cite the lack of relevant studies concerning the effect, if any, of meditation on short-term improvements in cognitive performance. The results of this study clearly showed that meditation, per se, does not produce a short-term improvement in cognitive performance compared to other relaxation techniques.