from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A diffuse network of nerve fibers and cells in parts of the brainstem, important in regulating consciousness or wakefulness.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Part of the brain that is involved in actions such as awaking/sleeping cycle, and filtering incoming stimuli to discriminate irrelevant background stimuli
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a complex neural network in the central core of the brainstem; monitors the state of the body and functions in such processes as arousal and sleep and attention and muscle tone
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