Meditation - Scientific Studies

Scientific Studies

Meditation has been linked to a variety of health benefits. A study of college students by Oman et al. (2008) found that meditation may produce physiological benefits by changing neurological processes. This finding was supported by an expert panel at the National Institutes of Health. The practice of meditation has also been linked with various favourable outcomes that include: “effective functioning, including academic performance, concentration, perceptual sensitivity, reaction time, memory, self control, empathy, and self esteem.”(Oman et al., 2008, pg. 570) In their evaluation of the effects of two meditation-based programs they were able to conclude that meditating had stress reducing effects and cogitation, and also increased forgiveness. (Oman et al., 2008)

In a cross-sectional survey research design study lead by Li Chuan Chu (2009), Chu demonstrated that benefits to the psychological state of the participants in the study arose from practicing meditation. Meditation enhances overall psychological health and preserves a positive attitude towards stress. (Chu, 2009)

Mindfulness Meditation has now entered the health care domain because of evidence suggesting a positive correlation between the practice and emotional and physical health. Examples of such benefits include: reduction in stress, anxiety, depression, headaches, pain, elevated blood pressure, etc. Researchers at the University of Massachusetts found that those who meditated approximately half an hour per day during an eight week period reported that at the end of the period, they were better able to act in a state of awareness and observation. Respondents also said they felt non-judgmental. (Harvard’s Women’s Health Watch, 2011)

"Meditation as Medicine" (American Academy of Neurology) cites scientific evidence from various studies which claim that meditation can increase attention span, sharpen focus, improve memory, and dull the perception of pain. The article lists as common types of meditation: Attention Meditation, Mindfulness Meditation, Passage Meditation and Benevolent Meditation.

Over 1,000 publications on meditation have appeared to date. Many of the early studies lack a theoretically unified perspective, often resulting in poor methodological quality, as discussed above in the section Definition and scope.

A review of scientific studies identified relaxation, concentration, an altered state of awareness, a suspension of logical thought and the maintenance of a self-observing attitude as the behavioral components of meditation; it is accompanied by a host of biochemical and physical changes in the body that alter metabolism, heart rate, respiration, blood pressure and brain activation. Meditation has been used in clinical settings as a method of stress and pain reduction. Meditation has also been studied specifically for its effects on stress. Despite the large number of scientific publications on meditation, its measurable effect on brain activity is still not well understood.

In June, 2007 the United States National Center for Complementary and Alternative Medicine published an independent, peer-reviewed, meta-analysis of the state of research on meditation and health outcomes. The report reviewed 813 studies in five broad categories of meditation: mantra meditation, mindfulness meditation, yoga, T'ai chi and Qigong. The result was mixed. The report concluded that "firm conclusions on the effects of meditation practices in healthcare cannot be drawn based on the available evidence. However, the results analyzed from methodologically stronger research include findings sufficiently favorable to emphasize the value of further research in this field." More rigor in future studies was called for.

More recent research suggests that meditation may increase attention spans. A recent randomized study published in Psychological Science reported that practicing meditation led to doing better on a task related to sustained attention.

A 2007 study by the U.S. government found that nearly 9.4% of U.S. adults (over 20 million) had practiced meditation within the past 12 months, up from 7.6% (more than 15 million people) in 2002.

Since the 1960s, meditation has been the focus of increasing scientific research of uneven rigor and quality. In over 1,000 published research studies, various methods of meditation have been linked to changes in metabolism, blood pressure, brain activation, and other bodily processes. Meditation has been used in clinical settings as a method of stress and pain reduction.

Meditation and intelligence

Recent investigations of mediation have linked it to increased intelligence through physical growth of the brain. Researchers at Harvard, Yale, and MIT conducted brain scans that reveal an increased thickness in the parts of the brain that deal with attention and sensory input processing. Using magnetic resonance imaging, they visualized variations in the thickness of the cerebral cortex of experienced Buddhist Insight meditation practitioners. The data show that regular practice of meditation is associated with increased thickness in a subset of cortical regions related to somatosensory, auditory, visual and interoceptive processing. Further, regular meditation practice may slow age-related thinning of the frontal cortex, leading to longer lasting executive functioning.

Another study investigated the effects of Transcendental Meditation on Cattell’s Culture Fair Intelligence Test (CFIT) and Hick’s reaction time, which are both correlated with general intelligence. In the study 100 men and women who meditated showed significant improvement on the tests compared to the control group of non-meditators, which showed no improvement. The results indicated that participation in meditation results in improvements to intelligence.

A study by Keith Wallace, David Johnson, and Paul Mills investigated the relationship between the paired H-reflex and the academic success of students practicing Transcendental Meditation. The paired H-reflex correlated significantly with GPA, but not with sat scores or any of three IQ measurements. The results suggest that meditation may be a useful indicator of academic achievement by "improving awareness and wakefullness".

Self-discipline, a trait linked to the practice of meditation has also been linked to increases in IQ scores. In a behavioral delay-of-gratification task with 8th graders, self-discipline accounted for more than twice as much variance as IQ in final grades, high school selection, school attendance, hours spent doing homework, hours spent watching television and the hour of the day students began their homework. The effect of self-discipline on final grades stayed even when controlling for grades, achievement-test scores, and measured IQ.