"You can know the name of a bird in all the languages of the world, but when you're finished, you'll know absolutely nothing whatever about the bird… So let's look at the bird and see what it's doing – that's what counts. I learned very early the difference between knowing the name of something and knowing something."

Richard Feynman, Physicist and 1965 Nobel Prize laureate (1918-1988)

"You have all I dare say heard of the animal spirits and how they are transfused from father to son etcetera etcetera – well you may take my word that nine parts in ten of a man's sense or his nonsense, his successes and miscarriages in this world depend on their motions and activities, and the different tracks and trains you put them into, so that when they are once set a-going, whether right or wrong, away they go cluttering like hey-go-mad."

Lawrence Sterne (1713-1758), "The Life and Opinions of Tristram Shandy, Gentleman" (1759)

I. The Insanity Defense

II. The Concept of Mental Disease - An Overview

III. Personality Disorders

IV. The Biochemistry and Genetics of Mental Health

V. The Variance of Mental Disease

VI. Mental Disorders and the Social Order

VII. Mental Ailment as a Useful Metaphor

I. The Insanity Defense

"It is an ill thing to knock against a deaf-mute, an imbecile, or a minor. He that wounds them is culpable, but if they wound him they are not culpable." (Mishna, Babylonian Talmud)

If mental illness is culture-dependent and mostly serves as an organizing social principle - what should we make of the insanity defense (NGRI- Not Guilty by Reason of Insanity)?

A person is held not responsible for his criminal actions if s/he cannot tell right from wrong ("lacks substantial capacity either to appreciate the criminality (wrongfulness) of his conduct" - diminished capacity), did not intend to act the way he did (absent "mens rea") and/or could not control his behavior ("irresistible impulse"). These handicaps are often associated with "mental disease or defect" or "mental retardation".

Mental health professionals prefer to talk about an impairment of a "person's perception or understanding of reality". They hold a "guilty but mentally ill" verdict to be contradiction in terms. All "mentally-ill" people operate within a (usually coherent) worldview, with consistent internal logic, and rules of right and wrong (ethics). Yet, these rarely conform to the way most people perceive the world. The mentally-ill, therefore, cannot be guilty because s/he has a tenuous grasp on reality.

Yet, experience teaches us that a criminal maybe mentally ill even as s/he maintains a perfect reality test and thus is held criminally responsible (Jeffrey Dahmer comes to mind). The "perception and understanding of reality", in other words, can and does co-exist even with the severest forms of mental illness.

This makes it even more difficult to comprehend what is meant by "mental disease". If some mentally ill maintain a grasp on reality, know right from wrong, can anticipate the outcomes of their actions, are not subject to irresistible impulses (the official position of the American Psychiatric Association) - in what way do they differ from us, "normal" folks?

This is why the insanity defense often sits ill with mental health pathologies deemed socially "acceptable" and "normal" - such as religion or love.

A mother bashes the skulls of her three sons. Two of them die. She claims to have acted on instructions she had received from God. She is found not guilty by reason of insanity. The jury determined that she "did not know right from wrong during the killings."

But why exactly was she judged insane?