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This paper reports the results of a prospective experiment in which a group of approximately 4,000 participants in the Transcendental Meditation and TM-Sidhi programs of Maharishi Mahesh Yogi assembled in Washington, D.C., from June 7 to July 30, 1993. It was hypothesized that levels of violent crime in the District of Columbia would fall substantially during the Demonstration Project, as a result of the group's effect of increasing coherence and reducing stress in the collective consciousness of the District. A 27-member Project Review Board comprising independent scientists and leading citizens approved the research protocol and monitored the research process. Weekly crime data was derived from database records provided by the District of Columbia Metropolitan Police Department (DCMPD), which are used in the FBI Uniform Crime Reports. Statistical analysis considered the effect of weather variables, daylight, historical crime trends and annual patterns in the District of Columbia, as well as trends in neighboring cities. Consistent with previous research, levels of homicides, rapes and assaults (HRA crimes) correlated with average weekly temperature. Robberies approximately followed an annually recurring cycle. Time series analysis of 1993 data, controlling for temperature, showed that HRA crimes dropped significantly during the Demonstration Project, corresponding with increases in the size of the group; the maximum decrease was 23.3% (p < 2 × 10-⁹) [24.6% using a longer baseline, with 1988-1993 data (p < 3 × 10-⁵)], coincident with the peak number of participants in the group during the final week of the assembly. When the same period in each of the five previous years was examined, no significant decreases in HRA crimes were found. Robberies did not decrease significantly. However, a model that jointly estimated the effect of the Demonstration Project on both HRA crimes and robberies showed a significant reduction in violent crimes overall of 15.6% (p = 0.0008). Further analysis showed that the effect of the coherence-creating group on reducing HRA crimes could not be accounted for by additional police staffing. The time series analysis for HRA crimes gave results that are highly robust to alternative model specifications, and showed that the effect of the group size was cumulative and persisted after the Demonstration Project ended. Also, calculation of the steady state gain based on the time series model predicted that a permanent group of 4,000 coherence-creating experts in the District would have a long-term effect of reducing HRA crimes by 48%.

Three studies on 362 high school students at three different schools in Taiwan tested the hypothesis that regular practice of the Transcendental Meditation (TM) technique for 15–20 min twice a day for 6 to 12 months would improve cognitive ability. The same seven variables were used in all studies: Test for Creative Thinking-Drawing Production (TCT-DP); Constructive Thinking Inventory (CTI); Group Embedded Figures Test (GEFT); State and Trait Anxiety (STAI); Inspection Time (IT); and Culture Fair Intelligence Test (CFIT). Univariate testing showed that TM practice produced significant effects on all variables compared to no-treatment controls (Ps ranged from .035 to &lt;.0001). Napping for equivalent periods of time as TM practice had no effect. Contemplation meditation improved inspection time and embedded figures, but not the other variables. The TM technique was superior to contemplation meditation on five variables. The effect sizes for TM practice were in the order of the variables listed above.

This two-year longitudinal study investigated the effect of participation in a special university curriculum, whose principal innovative feature is twice-daily practice of the Transcendental Meditation (TM) and TM-Sidhi program, on performance on Cattell's Culture Fair Intelligence Test (CFIT) and Hick's reaction time. These measures are known to be correlated with general intelligence. One hundred college men and women were the subjects—45 from Maharishi International University (MIU) and 55 from the University of Northern Iowa (UNI). The experimental group (MIU) improved significantly on the CFIT (t=2.79, P&lt;0.005); choice reaction time (t=9.10, P&lt;0.0001); SD of choice reaction time (t=11.39, P&lt;0.0001), and simple reaction time (t=2.11, P&lt;0.025) over two years compared to the control group, which showed no improvement. Possible confounds of subject's age, education level, level of interest in meditation, father's education level, and father's annual income were controlled for using analysis of covariance and stepwise regression. The results replicate the findings of previous longitudinal studies on intelligence test scores at MIU, and indicate that participation in the MIU curriculum results in improvements in measures related to general intelligence.