Effects of Transcendental Meditation practice on brain functioning and stress reactivity in college students
Introduction
Experience-related cortical plasticity was first identified during critical periods of development (von Senden, 1960, Hubel and Weisel, 1977), but now has been reported across the lifespan (Donoghue, 1995, Elbert et al., 1995, Buonomano and Merzenich, 1998, Merzenich, 1998, Maguire et al., 2006). Cortical plasticity explains learning (LeDoux, 2002, Zull, 2002). Synaptic connections are strengthened when students learn new facts, skills, and procedures (Mochizuki-Kawai et al., 2006).
Other experiences in college—high pressure, interrupted sleep, and alcohol and drug use—also leave their mark on brain functioning and behavior (Arnedt et al., 2005, Zeigler et al., 2005). Under high stress, the brain “downshifts” to a stimulus/response mode (Caine and Caine, 1991). Stress results in elevated sympathetic reactivity (Weekes et al., 2006), which can interrupt sleep causing excessive daytime sleepiness (Buboltz et al., 2001, Moo-Estrella et al., 2005) and cognitive deteriorations (Lee et al., 2003). High psychosocial stress causes brain regions involved in memory and emotions, such as the hippocampus, amygdala, and prefrontal cortex, to undergo structural remodeling, with the result that memory is impaired and anxiety and aggression are increased (McEwen, 1998, McEwen, 2006a, McEwen, 2006b).
The stress response is a normal response to prepare for emergency situations. However, if the system is not allowed to recover from stressful experiences, then the body becomes sensitized to stress (McEwen, 2004). The stress response may not turn off or it may get triggered by mild experiences (McEwen, 2006a, McEwen, 2006b).
Transcendental Meditation®1 practice is reported to decrease effects of previous stressful experiences and to help an individual function better in stressful situations. Transcendental Meditation practice is characterized by 1) lower sympathetic tone (Dillbeck and Orme-Johnson, 1987); 2) higher parasympathetic tone, as reflected in amplitude of the high frequency component of heart rate variability, also called respiratory sinus arrhythmia (Travis, 2001); and 3) higher levels of frontal EEG alpha coherence (8–12 Hz) (Dillbeck and Bronson, 1981, Gaylord et al., 1989, Travis, 2002, Travis et al., 2002) and frontal-parietal phase synchrony (Hebert et al., 2005). Simultaneous recording of EEG and MEG during Transcendental Meditation practice found that higher frontal and central scalp recorded alpha EEG activity is associated with MEG source location in medial frontal and anterior cingulate cortices (Yamamoto et al., 2006).
These physiological changes during Transcendental Meditation practice are associated with improvements in psychological functioning. A matched longitudinal study reported increases in Cattell Culture Fair IQ scores in college students after two years Transcendental Meditation practice (Cranson et al., 1991), and a random assignment longitudinal study reported increases in multiple measures of intelligence—Cattell Culture Fair IQ, practical intelligence, creativity, field independence and inspection time—after one year Transcendental Meditation practice (So and Orme-Johnson, 2001). A matched design reported greater flexibility in concept learning in college students (Dillbeck, 1982) and faster P300 latency in elderly participants (Goddard, 1989). A meta-analysis of 141 studies reported larger effect sizes for reduction of anxiety through Transcendental Meditation practice compared to other traditional meditation and clinical relaxation responses (Eppley et al., 1989). Another meta-analysis of 101 studies reported larger effect sizes for increases in self-actualization with Transcendental Meditation practice (Alexander et al., 1991).
Transcendental Meditation practice is also reported to result in improved health. A series of randomized controlled trials on the effects Transcendental Meditation practice on prevention and treatment of cardiac heart disease in multi-ethnic groups reported reductions in hypertension, atherosclerosis, left ventricular mass, and CHD morbidity and mortality in high-risk multi-ethnic populations practicing the Transcendental Meditation program, compared to controls (Schneider et al., 1995, Alexander et al., 1996, Castillo-Richmond et al., 2000).
Transcendental Meditation (TM) practice also changes brain patterns during challenging cognitive tasks after the meditation session. Nine brain measures including broadband inter- and intrahemispheric coherence (alpha: 8–12 Hz, beta: 12.5–20 Hz, and gamma: 20.5–50 Hz), broadband absolute and relative power, power ratios (alpha/beta and alpha/gamma), and cortical preparatory responses (contingent negative variation) were derived from EEG recorded during simple and choice reaction time tasks in 17 non-TM, 17 short-term (7.1 yrs TM) and 17 long-term TM participants (24.2 yrs TM). Of these nine brain measures, three measures were entered in a multiple discriminate analysis of group differences: 1) higher broad-band frontal (F3–F4) coherence (alpha, beta, and gamma), 2) higher alpha/beta absolute power ratios, and 3) better match between task demands and brain preparatory response (Travis et al., 2000, Travis et al., 2002, Travis, 2002). These empirically identified measures were converted to z-scores and combined to form a scale. This scale was called a “Brain Integration Scale” (Travis et al., 2002).
The Brain Integration Scale derived its name from the long-term TM participants in this research, who reported the permanent integration of deep meditation experiences with waking, sleeping and dreaming states. Also, this name was chosen because EEG frontal coherence, which was the first variable entered in the multiple discriminate analysis, reflects structural and functional connectivity between brain areas (Thatcher et al., 1986). Brain Integration Scale scores in these participants positively correlated with emotional stability, moral reasoning, and inner directedness, and negatively correlated with anxiety (Travis et al., 2004). Also, Brain Integration Scale scores were significantly higher in top-level managers compared to middle-level managers (Travis et al., in press). Thus, the Brain Integration Scale appears to tap brain patterns important for success in life.
Reported effects of Transcendental Meditation practice on psychological and physiological functioning could be beneficial for students and help them manage the stressful experiences of college. The current study uses a random-assignment clinical-trial design with pretest and 10-week posttest to investigate effects of Transcendental Meditation practice on brain functioning, autonomic reactivity, heart rate, sleepiness, and speed of processing. The study hypotheses were that participants randomly assigned to learn the Transcendental Meditation technique, compared to wait-listed controls, would 1) increase in Brain Integration Scale scores; 2) increase in parasympathetic tone as measured by the amplitude of respiratory sinus arrhythmia during paced breathing; 3) decrease in sympathetic reactivity as measured by faster habituation rates to an 85-dB tone; 4) decrease in heart rate; 5) decrease in sleepiness levels as measured by Epworth Sleepiness Scale; and 6) have faster brain response times, as measured by shorter P300 latencies to novel stimuli.
Section snippets
Study design
Pretest data were recorded from 50 students at the beginning of the Spring 2006 term. The students responded to signs advertising the research and came to introductory meetings that explained the study. At these meetings, students volunteered to be part of the EEG section of this study. Following baseline recordings, students were randomly assigned, using computer randomization, to either Immediate-start or Delayed-start in Transcendental Meditation instruction. The posttest occurred 10-weeks
Pretest analyses (N = 50)
A MANOVA tested initial group differences. The omnibus F-test of all subjects (N = 50) did not yield significant main effects for group (Wilk's Lambda F(6,43) < 1.0, ns). The F-test of subjects with complete data (N = 38) also did not yield significant main effects for group at pretest (Wilk's Lambda F(6,32) < 1.0, ns). ANOVAs comparing pretest group differences on individual variables also did not yield significant effects—all p values > .19. Table 1 below presents the pretest means and standard
Discussion
Significant differences in Brain Integration Scale scores, sleepiness, and habituation rates were seen after 10 weeks of Transcendental Meditation practice. Lower sleepiness and faster habituation rates were negatively correlated with higher scores on the Brain Integration Scale. This study reports effects of Transcendental Meditation practice compared to wait-listed controls. Future research could compare effects of Transcendental Meditation practice to other programs of stress reduction in
Acknowledgments
We thank the Abramson Family Foundation, Howard and Alice Settle and other private donors for funding this study. We also thank Mario Orsatti and Linda Mainquist for coordinating and conducting the Transcendental Meditation intervention in this study.
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