BRAINWAVE
insight, brainstorm, brainwave
(noun) the clear (and often sudden) understanding of a complex situation
brainwave, brain wave, cortical potential
(noun) (neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph
Source: WordNet® 3.1
Etymology
Noun
brainwave (plural brainwaves)
Any of many rhythmic fluctuations of electric potential between parts of the brain, especially those seen on an electroencephalogram
A sudden idea, understanding, or inspiration; a brainstorm
Source: Wiktionary