Figure 1.

Self-reports of meditation depth for the five depth levels: (A) hindrances (DL0), (B) relaxation (DL1), (C) concentration (DL2), (D) transpersonal qualities (DL3) and (E) nonduality (DL4). Each depth level is plotted for the two groups, controls and long-term meditators, and for four time-points, baseline (BL), chanting (CH), first meditation practice (M1) and second meditation practice (M2). The error bars indicate standard errors of the means. Significance levels: *P < 0.05; **P < 0.01; P < 0.005; ****P < 0.001