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Brain tour

Brain Basics
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Alzheimer's Disease and the Brain
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Credits

7. Signal coding

100 billion nerve cells… 100 trillion synapses…. dozens of neurotransmitters… This “strength in numbers” provides your brain’s raw material. Over time, our experiences create patterns in signal type and strength. These patterns of activity explain how, at the cellular level, our brains code our thoughts, memories, skills and sense of who we are.

The positron emission tomography (PET) scan on the left shows typical patterns of brain activity associated with:

Activity is highest in red areas and then decreases through the other colors of the rainbow from yellow to blue-violet.

Specific activity patterns change throughout life as we meet new people, have new experiences and acquire new skills. The patterns also change when Alzheimer’s disease or a related dementia disrupts nerve cells and their connections to one another.

©2009 Alzheimer's Association. www.alz.org. All rights reserved. Illustrations by Stacy Janis.
This is an official publication of the Alzheimer’s Association but may be distributed by unaffiliated organizations and individuals. Such distribution does not constitute an endorsement of these parties or their activities by the Alzheimer’s Association.