Apparently left-handed people would get electrical stimulation on the wrong side of the brain when getting therapy about depression and recalcitrant anxiety. Their emotion brain hemispheres seems to be reversed.
“Treatment for the most common mental health problems could be ineffective or even detrimental to about 50 percent of the population, according to a radical new model…”
www.sott.net/article/388735-Why-being-left-handed-matters-for-treatment-of-mental-health-problems