While researchers have long known that meditation can help lower a person's stress levels, it's only recently that researchers have started to look at how that's happening in the brain itself. In one recent study, MRI scans of participants who had gone through mindfulness meditation training had a decrease in activation in the right amygdala. This region is responsible for deciding which emotions to use when you're exposed to things in the outside world and is often also known for being the brain's fight-or-flight center. Lower activation could mean a more controlled emotional response to what's going on in your life. Another study found that meditation might lead to changes in grey matter in regions of the brain regulating emotion and getting perspective on life events. Together, these changes show how the brain shifts its own structure to respond better to emotionally challenging and stressful situations.