This is a quick listing of common causes for this particular personality shift, which is best described as an unusual and rapid increase in trait psychoticism as defined by Eysenck (both the good and bad parts) over the course of about 2 years.
-A blow to the head (particularly around age 3).
-High prenatal testosterone. (Probably also high testosterone during other important development periods such as puberty.)
-Major depression in early 20s.
-Adverse reaction to vaccines.
-Onset of Parkinson’s disease.
-Pre-teen negative affect reciprocity leading to antisocial, anti-authoritarian mindset (ex. a procession of really stupid math teachers).
My current theory is that mapper cognition is due to gray matter dominance of large-scale dynamics in the brain, due to a high ratio of gray matter vs. white matter. These people are “visual learners”, lateral thinkers, averse to boredom, etc., and tend to have higher nonverbal IQ than verbal IQ. Almost all geniuses have this characteristic, as well as high general intelligence.
Some people start out as mappers. (However, I believe this is unhealthy and may lead to some common symptoms of autism.) Some people are more predisposed to become mappers, and there are some risk factors that are obvious to the naked eye:
-IQ above 135 or below 100
-Hostile environment, bullying
-Heavy use of visuospatial reasoning in daily life (working as a cab driver or mechanic)