Women were excluded from the study participation if they 1) had significant
back problems or experienced claustrophobia in the past that would interfere with the fMRI procedure; 2) weighed more than 200 pounds; 3) were currently pregnant, nursing, or
trying to become pregnant; 4) had any mechanically activated or metal implants, permanent retainers, piercing that can not be removed, or electrical implants; and 5) had a history or current diagnosis of seizures, diabetes requiring insulin treatment, heart attack, stroke, blood clots, high blood pressure, or
chronic pain.