Tags
Schizophrenic mental patient from Rob Zombie’s 2007 remake of Halloween
Halloween is coming up, so my posts are going to start getting scarier. It’s long been noted that criminals have lower IQ’s than non-criminals, and that psychotics have lower IQ than non-psychotics, so it’s only logical to assume that people who are criminally psychotic would have especially low IQ’s.
How low? Let’s begin with the fact that criminals average IQ’s 10 points lower than the non-criminal population. If we assume the United States has an average IQ of 97, then criminal Americans should have an average IQ of 87. Now it’s known that premorbid schizophrenics average IQ’s 9 points lower than matched controls. I don’t know how closely matched these matched controls are but assuming they are identical in all other ways except schizophrenia (which of course they’re not), we should expect schizophrenic criminals to have premorbid IQ’s 9 points lower than non-schizophrenic criminals. But since in rare cases, schizophrenia actually causes crime, the two variables are obviously not 100% independent, so let’s say schizophrenic criminals have pre-morbid IQ’s only 5 points lower than non-schizophrenic criminals. This implies an average IQ of 82. However once schizophrenia emerges, average IQ drops by 6 points, so their IQ’s would be reduced to 76.
After analysing the data for homicide rates and IQ average for countries in my own way, I observed that until the average IQ of 80 there is very weak correlation between IQ and homicide rates.
http://alcoholicwisdom.wordpress.com/2014/10/09/iq-vs-homicide-rate-for-countries/
However, above 80, the correlation gains momentum on the negative side, reaching a correlation of about -0.38.
This is country data, I do not know how it relates to criminals in a country, however it is an interesting coincidence that criminality reaches highest position on about IQ average 80s.
Alcoholicwisdom, your results on countries sounds similar to studies on individuals.
According to Jensen, people with IQ’s around 85 are most at risk for being violent criminals, and the further you deviate from IQ 85, in either direction, the less criminal you are likely to be. In a way that makes sense, because people who are mentally disabled often seem so incredibly nice that they wouldn’t hurt a fly; so yes, the relationship between IQ and crime is perhaps non-linear, as Jensen says.
But predicting criminality from IQ should not be confused with predicting IQ from criminality.
Pingback: HBD in Texas Chainsaw 3D | Pumpkin Person
Pingback: The IQ’s of slashers | Pumpkin Person