PET Imaging: The Real Positronic Brain?

In Isaac Asimov’s 1950 short story collection I, Robot, intelligent robots with positronic brains exist alongside humans. Unlike conventional computer hardware, the word positronic implies that electrical current is carried in the wires of these robots’ brains by  positrons, the antimatter counterpart of the familiar electron. Though the advantage of antimatter here is anyone’s guess, the stories of I, Robot may have introduced the positron to the public.  And as bizarre as Asimov’s fantasy sounds, neuroimaging has given the term “positronic brain” yet another meaning.

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A Close Look into the Alzheimer’s Brain

Your brain is able to store massive amounts of memories throughout your lifetime.  There are cases, however, in which this ability progressively degrades and eventually disappears, giving way to problems with thinking, reasoning, and remembering.  When these symptoms occurs faster than normal aging, it is termed dementia.  Alzheimer’s disease (AD) is the most common form of brain function loss, and its neuropathology are summarized here.Continue reading