Posted by:
SL Cabbie
(
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Date: March 11, 2011 08:31PM
And what caused them? Nature or nurture?
BTW, the orbital frontal lobes--where the gyrus(es?) referred to are located, contain the most dopamine sensitive structures--the ones I referred to--above. Back when I was reviewing the research on this one, the literature was showing that rats would self-medicate with cocaine injections (cocaine blocks the reuptake of a number of neurotransmitters) to the point of death, and the dominergic structures were heavily involved; it was, as nearly as I could tell, more than just the pleasure centers that were involved, since dopamine also involved in muscular activity. These rats were literally helpless to stop their behavior as an act of "will." Any addict in recovery can attest to the validity of that one.
http://en.wikipedia.org/wiki/Frontal_lobe>The frontal lobe contains most of the dopamine-sensitive neurons in the cerebral cortex. The dopamine system is associated with reward, attention, long-term memory, planning, and drive. Dopamine tends to limit and select sensory information arriving from the thalamus to the fore-brain. A report from the National Institute of Mental Health says a gene variant that reduces dopamine activity in the prefrontal cortex is related to poorer performance and inefficient functioning of that brain region during working memory tasks, and to slightly increased risk for schizophrenia.
As for that smallish structure hidden deep within the brain, the amygdala...
http://www.kurzweilai.net/amygdala-size-correlated-with-size-complexity-of-ones-social-networks>“We know that primates who live in larger social groups have a larger amygdala, even when controlling for overall brain size and body size,” said Barrett. “We considered a single primate species, humans, and found that the amygdala volume positively correlated with the size and complexity of social networks in adult human."
Okay, but what is the result of trauma in one's upbringing on the amygdala and the structures mentioned near the cerebral cortext? And nutrition? This question suggests itself:
Did they control for the use of psychoactive drugs such as cocaine and alcohol in their study? I suggest that sociopathic types (and those with addictive disease) wouldn't have given reliable answers in their case histories in the first place.
This would prevent a determination of whether the cause was likely to be genetic or environmental...
And from my modest readings on brain size, it's not the size of the brain that determines the complexity of the function, it's the "wrinkles." That's a bit of a silly simplification, but what it strongly suggests is that the deeper and intricate connections involving "the wiring" are related to the complexity of the cognitive operations.
Now I'll repeat my question above: "Off the top of my head, if a trait is inherited, then the normal distribution curve of intelligence ought to apply, and if not, why not?"
Finally, perhaps you'd like to comment on the article I just read a few days ago about how psychiatrists are rarely engaging in psychotherapy these days (as opposed to psychologists and clinicial social workers, among others).
I'll also suggest the reason for that howler, "psychopaths have lower intelligences than normal" is that the smart psychopaths mangage to avoid being identified.
Edited 1 time(s). Last edit at 03/11/2011 08:36PM by SL Cabbie.