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Similarly startling transformation have been recorded among soldiers with penetrating head injuries suffered in World War I. Orbitomedial wounds made people "pseudopsychopathic": grandiose, euphoric, disinhibited, and puerile. When the dorsolateral convexities were damaged, those affected became lethargic and apathetic ("pseudodepressed"). As Geschwind noted, many had both syndromes.

In a study titled “Gray Matter Abnormalities in Patients with Narcissistic Personality Disorder” (published June 2013 in the Journal of Psychiatric Research), the authors conclude:

“Relative to the control group, NPD patients had smaller GM volume in the left anterior insula. Independent of group, GM volume in the left anterior insula was positively related to self-reported emotional empathy. Complementary whole-brain analyses yielded smaller GM volume in fronto-paralimbic brain regions comprising the rostral and median cingulate cortex as well as dorsolateral and medial parts of the prefrontal cortex. Here we provide the first empirical evidence for structural abnormalities in fronto-paralimbic brain regions of patients with NPD. The results are discussed in the context of NPD patients' restricted ability for emotional empathy.”

The DSM is clear: the brain-injured may acquire traits and behaviors typical of certain personality disorders but head trauma never results in a full-fledged personality disorder.

"General diagnostic criteria for a personality disorder:

F. The enduring pattern is not due to the direct physiological effects of a substance (e.g., a drug of abuse, a medication) or a general medical condition (e.g., head trauma)." (DSM-IV-TR, p.689)

From my book "Malignant Self-love - Narcissism Revisited":

"It is conceivable, though, that a third, unrelated problem causes chemical imbalances in the brain, metabolic diseases such as diabetes, pathological narcissism, and other mental health syndromes. There may be a common cause, a hidden common denominator (perhaps a group of genes).

Certain medical conditions can activate the narcissistic defense mechanism. Chronic ailments are likely to lead to the emergence of narcissistic traits or a narcissistic personality style. Traumas (such as brain injuries) have been known to induce states of mind akin to full-blown personality disorders. Such "narcissism", though, is reversible and tends to be ameliorated or disappear altogether when the underlying medical problem does. Other disorders, like the Bipolar Disorder (mania-depression) are characterised by mood swings that are not brought about by external events (endogenous, not exogenous). But the narcissist's mood swings are strictly the results of external events (as he perceives and interprets them, of course).

But phenomena, which are often associated with NPD (Narcissistic Personality Disorder), such as depression or OCD (obsessive-compulsive disorder), are treated with medication. Rumour has it that SSRI's (such as Fluoxetine, known as Prozac) might have adverse effects if the primary disorder is NPD. They sometimes lead to the Serotonin syndrome, which includes agitation and exacerbates the rage attacks typical of a narcissist. The use of SSRI's is associated at times with delirium and the emergence of a manic phase and even with psychotic microepisodes.

This is not the case with the heterocyclics, MAO and mood stabilisers, such as lithium. Blockers and inhibitors are regularly applied without discernible adverse side effects (as far as NPD is concerned).

Not enough is known about the biochemistry of NPD. There seems to be some vague link to Serotonin but no one knows for sure. There isn't a reliable non-intrusive method to measure brain and central nervous system Serotonin levels anyhow, so it is mostly guesswork at this stage."

Read more about Narcissism and the Bipolar Disorder - click HERE!

Read more about Narcissism and Asperger's Disorder - click HERE!