Chakra Meditation fMRI Dataset

# Chakra Meditation fMRI Dataset Block-design task-fMRI of expert kundalini-yoga chakra meditation, acquired at the PRSM lab, Leiden University. This is a small-N (N = 2 practitioners) proof-of-concept / calibration dataset; it is released raw for reuse. ## Participants and sessions - **sub-01** (Yogi 1) — three sessions (ses-01, ses-02, ses-03), acquired as pilots 1, 2 and 3 respectively. Acquisition differs across sessions: - ses-01: single-echo BOLD, B0 fieldmap. - ses-02: mixed single-/multi-echo BOLD, **no fieldmap** (synthetic distortion correction was used downstream). - ses-03: three-echo BOLD, B0 fieldmap. - **sub-02** (Yogi 2) — one session (ses-01), acquired as pilot 4; three-echo BOLD with per-run B0 fieldmaps. The two subjects are two different people. Within-subject acquisition differences across sub-01's sessions are real and intentional (pilot iterations), not errors. ## Tasks Each functional run is a block design. Most runs contain a Yogic Resting State (YRS) baseline block followed by one chakra-meditation block; the run is named for that chakra. Block onsets and durations are in each run's `events.tsv`. - `task-yrs` — baseline run (Yogic Resting State, sometimes preceded by a Spontaneous Resting State (SRS) block; see `events.tsv`). - `task-manipura`, `task-anahata`, `task-ajna`, `task-sahasrara` — the four chakra meditations (YRS baseline block + chakra block). - `task-ycs` — a single exploratory run sweeping all seven chakras then oscillating between Anāhata and Ājñā. - `task-movie` — two Pilot-2 movie-watching control runs. The BOLD is shared; the film stimulus itself is not included. `sub-01/ses-03` contains two Sahasrara runs (`run-01`, `run-02`). The second (originally "S7", informally the "secret" meditation) is also a Sahasrara practice. ## Multi-echo sub-01/ses-02, sub-01/ses-03 and sub-02 are multi-echo (`echo-1/2/3`). The multi-echo-combined / TEDANA-denoised (“MEICA”) images are a *derivative* and are **not** part of this raw release. ## Trial-type labels (events.tsv) - `YRS` — Yogic Resting State (trained baseline) - `SRS` — Spontaneous Resting State (untrained baseline) - `YCS` — Yoga Chakra Sequence (seven-chakra sweep) - `Manipura` / `Anahata` / `Ajna` / `Sahasrara` — chakra meditation blocks - `moviesx` / `moviesy` — movie-watching blocks ## De-identification Anatomical images (T1w/T2w) have been defaced. Identifying fields have been removed from JSON sidecars. Raw scanner physiological logs (SCANPHYSLOG) are not included.