Archive for October, 2009

Brain Size

Monday, October 5th, 2009

I’m still wresting with a number of themes suggested by the Science News article released last week. I study autism and Aspergers as conditions evidencing information and orientations that may throw light upon how humans evolved. I ended up in this area of study after hypothesizing that if we evolved from larger brained, primary process (one time, one place, no opposites), matrifocal, dance driven societies then the reasons brains may have started growing smaller 25,000 years ago was because we were shifting from primary process to split conscious (smaller) brain structures, patrifocal societies, evidencing speech arts more than dance.

Looking for larger brained, speech impaired, primary process inclined contemporaries, the autistic fit the paradigm to a “t”.

The recent science article noted a study alluding to another study that I was not aware of, one that said about 25% of the autistic have larger brains. I thought it was a larger percentage. I can’t find the study alluded to in the article.

So, I am now particularly interested in what studies state what percentages of the autistic (and Aspergers) have larger brains. I’m particularly interested in how the larger brained autistic spectrum individuals are different than those with normal sized brains. In addition, how much of the larger brain size is due to a left hemisphere that did not experience infant and childhood synapse pruning? Do the autistic with normal brain size have their left hemispheres pruned or not pruned?

Brain size is one of the anomalies of being autistic. It would be also useful to know whether in the increases of autism in the last twenty years if the increases are more or less those with larger brains.

If we are to understand varying etiologies of autism, it is necessary we be able to assign features of the condition to the various ways that autism is neurologically displayed.

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