Autistics have less brain activity?

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Well, if they were looking at all over brain activity, as in how electrical activity lights up a map of the brain, I'm sure NT's do have 'more' activity. They have more diffuse connections where autism has more concentrated connections thus 'less lights'. They's have to measure brain electrical activity in some equivilent of amps/volts/wattage whatehaveyou to tell exactly how much energy is being output. Looking at where the brain power is going may be an excellent dx tool - many with ASD have had brain scans that confirm this concentration of neural connections. If it could be standardized it could be a definitative, medically accurate diagnosis for autism.

Saying brains with autism are 'less active' is simply... dumb, given what science has already learned.

I think the difference between real autism and aspergers is huge and how large the spectrum is shouldnt be forgotten. Looking at what people write on here alot of the people seem to have aspergers which has benefits typically along with some social difficulties. Whilst people with autism have more negatives....like less thoughts. Either way the spectrum is huge.

There has been some preliminary research that suggests that people with HFA/AS may have reduced activity in their Medial Prefrontal Cortex, and also some mirror neurons compared to NTs, which may both impact on their ability to flexibly navigate social situations with NTs and understand presuppositions and assumptions about various social contexts in a rapid manner.

I'm not sure if reduced activity in the Medical Prefrontal Cortex also contributes to the Executive Dysfunction (to various degrees) experienced by many on the Autism Spectrum, but I'm pretty sure that some portion of the Prefrontal Cortex (or neurotransmitter levels/receptor activity) has to be affected in ASD individuals as the Executive Functions (to access "higher order thinking" such as planning, dealing with rapid changes and organization) are primarily operated by the Prefrontal Cortex.

My brain is very active. This is why I can't stop thinking, and it's also why I get so agitated all the time. Also, I can't do a job where I'm just sitting there at a till waiting to serve customers all day. For one thing I find interaction with customers hard, and for another thing, my mind is too optimistic. I like to be doing something, like sitting at a computer doing assignments, et cetera. Not too much rushing about and physical multitasking, but not too much having to sit there staring at the walls all day. I need to be sitting but still busily doing something.