5 ms·

This study of memory loss in mice found that exposing them to light at about 40hz triggered gamma waves and reduced plaque formation. https://news.mit.edu/2016

• delecti 9y ago
  We perceive visual stimuli as distinct events (up to a certain frequency), but when hearing, a 40 Hz sound isn't perceived as 40 individual sounds per second.
  • cassianoleal 9y ago
    Perhaps because it isn't? Waves are not discrete structures. 40Hz means you have 40 wave cycles per second, not 40 discrete sounds.
    • delecti 9y ago
      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.