That's kinda what I'm getting at. My understanding is that brain waves are more akin to a CPU clock, with various processes being synchronized, than to a sound

That's kinda what I'm getting at. My understanding is that brain waves are more akin to a CPU clock, with various processes being synchronized, than to a sound wave. If that's the case, then you wouldn't have any reason to expect sound to make a difference in your brain's clock rate, but you could reasonably expect light pulses to.