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Norepinephrine

Visuals increase attention; now science explains why. Scientists report that norepinephrine, a fundamental chemical for brain performance, is locally regulated in a brain region called the visual cortex. Source 6j.

Norepinephrine

A chemical produced by some nerve cells and in the adrenal gland. It can act both as a neurotransmitter (Chemical messenger used by nerve cells), and as a hormone (Chemical substance that travels through the blood and controls the actions of other cells or organs).