Richard J. Davidson, founder and director of the Center for Healthy Minds at the University of Wisconsin–Madison, notes that even modest amounts of meditation—under 10 hours of practice in beginners—can change brain plasticity. But he cautions against commercializing the jhanas prematurely. “People saying this benefits them is all well and good, but without real scientific evidence, we have no idea,” he says. “Anyone trying to monetize this should raise red flags.”