A “left-shift” has been noted in which the left frontal activity of the brain is enhanced following MBSR training. This electrical change in brain function is thought to reflect the cultivation of an “approach state,” in which we move toward, rather than away from, a challenging external situation or internal mental function such as a thought, feeling, or memory. Naturally, such an approach state can be seen as the neural basis for resilience.
The degree of this left-shift is proportional to the improvement seen in immune function. Our mind not only finds resilience, but our body’s ability to fight infection is improved. At the University of California, Los Angeles, David Cresswell and his colleagues have found that MBSR improves immune function even in those with HIV. Improved immune system function may help explain the increase in healing found in the psoriasis treatment studies with mindful reflection during treatment.
MBSR studies reveal that patients feel an internal sense of stability and clarity. Using a modified version of a general MBSR approach, researchers at the UCLA Mindful Awareness Research Center, found that adults and adolescents with attentional problems achieved more executive function improvements (sustaining attention, diminishing distractibility) than are accomplished with medications for this condition.
MRI scans show that after an eight-week course of mindfulness practice, the brain’s “fight or flight” center, the amygdala, appears to shrink. This primal region of the brain, associated with fear and emotion, is involved in the initiation of the body’s response to stress.