[contingencies]

TM (and indeed vipaasanaa and other western hemisphere faddish takes on shutting up and sitting still for awhile) are just an offshoot of India's larger and longer tradition of yoga, no? Which isn't to say India has a monopoly on meditative tradition (cue ~neighbouring Daoists, Sufis, various extremo Christian sects though these usually limited to monks IIRC, etc.), just that it seems more dominant there than anywhere else. Point being, research on meditation has focused largely on yoga, and not without reason: I'd be surprised if TM isn't a sort of statistical aberration in the literature.