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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Disruption of Circadian Cycles Linked to Weight Gain

Every night during finals week, I studied into the wee hours of the morning and caught only a few hours of sleep. It was exhausting! After finals were over, I felt like a heavy weight had been lifted off my shoulders, but I also felt a few pounds heavier! Sure, late night studying was paired with late dinners and snacks, but the weight came so quickly and was incredibly difficult to lose. What happened? I blamed my overly self-conscious analysis and the high calorie foods. Now, researchers at Vanderbilt suggest another cause: disruption of the sleep-awake cycle!Continue reading