Dynamic brain states underlying advanced concentrative absorption meditation: A 7-T fMRI-intensive case study

Figure 1.. SFC during ACAM-J. (A) The z-scored connectivity values are plotted for the average of all 26 jhana runs. (B) The results of a one-sample t test for jhana SFC minus control SFC. The color indicates how significant the difference was; red colors represent positive differences and blue colors represent negative differences and nonsignificant pairwise connections are in white.

Figure 2.. Dynamic functional connectivity brain state clustering. (A) Brain State 1, also called DMN-anticorrelated brain state. (B) Brain State 2, also called hyperconnected brain state. (C) Brain State 3, also called sparsely connected brain state.

Figure 3.. Average prevalence of each brain state during each ACAM-J state. Standard errors are plotted for each jhana state and brain state. Afterglow refers to the period after the jhanas are completed.

Figure 4.. Logistic model fits for Brain State 1 prevalence during ACAM-J. ACAM-J states are reflected on the x-axis while the prevalence of the brain state is reflected on the y-axis. Points reflect the presence of brain state (0 = not present, 1 = present), and are jittered for ease of viewing. Points for ACAM-J6–J8 are extended to match durations of previous ACAM-J states. The gray lines reflect logistic fits for each ACAM-J run, and the black line is the mean, with gray standard error shading. Afterglow is not plotted because main logistic models exclude afterglow.

Figure 5.. Logistic model fits for Brain State 2 prevalence during ACAM-J. ACAM-J states are reflected on the x-axis while the prevalence of the brain state is reflected on the y-axis. Points reflect the presence of brain state (0 = not present, 1 = present), and are jittered for ease of viewing. Points for ACAM-J6–8 are extended to match durations of previous ACAM-J states. The gray lines reflect logistic fits for each ACAM-J run, and the black line is the mean, with gray standard error shading. Afterglow is not plotted because main logistic models exclude afterglow.

Figure 6.. Self-report physical sensations versus dwell time in Brain State 2. Scatterplots are presented for ratings of physical sensations for 26 jhana runs versus dwell time in Brain State 2. On the y-axis, the ratings (1–10). On the x-axis, the dwell time, in number of TRs. Lines reflect smoothed linear fits, with standard error shading. The circle points and solid line reflect ratings during the form jhanas (ACAM-J1–J4), and the triangle points and dashed line reflect ratings during the formless jhanas (ACAM-J5–J8).