The Science Behind It

What does practice do to the brain? The clearest evidence is functional. The amygdala — your threat detector — tends to grow less reactive, and that shift tracks with lower stress. It still fires when needed, but stops reacting to every minor annoyance.

The structural picture is more debated. Harvard researcher Sara Lazar reported that eight weeks of practice — about 27 minutes a day — was linked to denser gray matter in the hippocampus, a region central to learning and memory. It is a striking result, but larger follow-up studies have struggled to reproduce the structural changes, so treat that part as promising rather than settled.