The criteria the Fred used to find his subjects in CC was that they had to have continuous integration of transcendental experiences (TE) with waking and sleeping for at least 1 year. The "Cont-TE" group.
Two other groups were chosen as well: people who intended to learn TM but had not yet started and had rare (less than 1 per year -the "Rare-TE" group) transcendental experiences, and people who had been practicing TM for a while, but did not report frequent transcendental experiences outside of meditation (between 1 and 10 TE per year -the "Occas-TE" group). A semi-structured interview and two measures of TE were used to substantiate subjects’ self-reports of inner experiences. The two measures had been developed by non-TMers to measure frequency of transcendental experiences in the general population: Hood’s M-Scale from [Hood, R.W., 1975. The construction and preliminary validation of a measure of reported mystical experience. Journal of Scientific Study Religion 14, 29-41] and Baruss’s Physical-Transcendent Scale from [Baruss, E., Moore, R.J., 1992. Measurement of beliefs about consciousness and reality. Psychology Reports 71, 59-64] Group means for M-Scale were: Rare-TE:/18.19 +/-6.47; Occas-TE:/39.59 +/-3.15; Cont-TE:/60.79 +/-0.61. Group means for the Physical-Transcendent Scale were: Rare-TE:/35.79 +/-5.21; Occas-TE:/61.49 +/-4.71; Cont-TE:/84.19 +/-2.96. Various EEG and other physical measures were done as well as interview questions. The results were reported in two different papers: http://www.totalbrain.ch/wordpress/wp-content/uploads/2007/05/brain-integration-progress-report.pdf http://www.totalbrain.ch/wordpress/wp-content/uploads/2007/05/brain-integration-progress-report.pdf http://www.totalbrain.ch/wordpress/wp-content/uploads/2007/05/eeg-of-enlightenment.pdf http://www.totalbrain.ch/wordpress/wp-content/uploads/2007/05/eeg-of-enlightenment.pdf L