Brain Basics
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Alzheimer's Disease and the Brain
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Act 17


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: