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To: freelyhovering who wrote (4002)	4/4/1999 5:29:00 PM
From: j g cordes	Respond to of 13094

when I saw that feature I wondered if at some point the mind needs to have files erased to make room?

To: freelyhovering who wrote (4002)	4/4/1999 10:17:00 PM
From: j g cordes	Respond to of 13094

I wonder if headaches come from extended episodes of a person trying to perform one or the other against their 'nature.' "Thursday April 1 2:01 PM ET Blood flow patterns in brain tied to personality NEW YORK, Apr 01 (Reuters Health) -- People who are shy and those who are outgoing can credit their brains for their personalities, according to a report in the American Journal of Psychiatry. Using brain scans, Dr. Debra Johnson from the University of Iowa, Iowa City, and colleagues found that introverts show more blood flow and activity in brain areas known as the frontal lobes and in the anterior thalamus, which are areas believed to be responsible for remembering, problem solving, and planning. In contrast, extroverts exhibit more activity in the anterior cingulate gyrus, temporal lobes and posterior thalamus -- areas of the brain thought to be more involved in sensory processing such as listening, watching, or driving. ''These variations in brain activity suggest that a lot of our individual differences have an underlying biological cause,'' said Johnson in a statement. ''Introverts get more of their stimulation internally, whereas extroverts seek outside sources. Extremely introverted and extroverted personalities are two ends of a continuum, with most people falling somewhere in between,'' Johnson explained. Johnson and her team studied 18 individuals between the ages of 19 and 48. All took personality tests then underwent positron emission tomography (PET), which measured the blood flow in various areas of the brain. While undergoing the scan, the volunteers were asked to think freely about anything, which provided a picture of the activity of their uncensored minds. The researchers found that blood flow patterns in the brain differed between introverts and extroverts. ''The present study did not provide a definitive answer concerning the relation between personality and brain activity. It does, however, add to a growing literature which suggests that human personality traits are based on individual differences in brain function,'' conclude the investigators. SOURCE: American Journal of Psychiatry 1999;156:252-257.