Shapiro (1992), Craven (1989) et Kutz et al. (1985a,b).

« This article reviews 75 scientific selected articles in the field of meditation, including Transcendental Meditation among others. It summarizes definitions of meditation, psychological and physiological changes, and negative side-effects encountered by 62.9% of meditators studied. While the authors did not restrict their study to TM, the side-effects reported were similar to those found in the "German Study" of Transcendental Meditators: relaxation-induced anxiety and panic; paradoxical increases in tension; less motivation in life; boredom; pain; impaired reality testing; confusion and disorientation; feeling 'spaced out'; depression; increased negativity; being more judgmental; feeling addicted to meditation; uncomfortable kinaesthetic sensations; mild dissociation; feelings of guilt; psychosis-like symptoms; grandiosity; elation; destructive behavior; suicidal feelings; defenselessness; fear; anger; apprehension; and despair.” (...) “Traditionally meditation has been practised within a religious context. Only in modern times have the techniques of meditation been extracted from their spiritual and philosophical context and applied to the promotion of individual well-being.”