Electrical impulses; inspiration; brainstorm.
Brain waves are electrical impulses given off by brain tissue which can be measured by an electroencephalogram.
Brain waves can also mean an inspiration, sudden idea or brainstorm.
Ideas !
Brainwaves in a crossword is usually "ideas."
The usual answer is "ideas." The "h" may be incorrect.
Thoughts
idea
ideas
ideas
ideas
ideas
ideas
Neural oscillations.
idea or alpha