Gamma brain waves are the fastest brain waves produced inside your brain.
Although they can be hard to measure accurately, they tend to measure above 35 Hz and can oscillate as fast as 100 Hz.
Your brain tends to produce gamma waves when you’re intensely focused or actively engaged in solving a problem.
“Although they can be hard to measure accurately, they tend to measure above 35 Hz and can oscillate as fast as 100 Hz.”
There is no upper limit.