What we think, but more importantly, brain function is 100% correlated with How we think. How we think is usually described, from the mental health perspective, in diagnostic terms: ADHD, PTSD, Addictions, Depression, Anxiety, etc. Comprehensive studies in brain function have narrowed most mental health issues down to the healthy or unhealthy chemical/electrical reaction called neurotransmission. When that reaction is healthy, good mental health occurs.