3 ms·

None of those sound non invasive. How do they get light through the skull?

• brian_spiering 7y ago
  "Non invasive" in this context means not physically opening the skull and inserting a device.
• brian_spiering 7y ago
  Typically, it is not wavelengths from the visual light spectrum. It is common to use infrared. For example, high-power infrared light can penetration at least 3 cm into the brain.
  • gimmeThaBeet 7y ago
    Uhh, I'm sure it's fine, but how high power are we talking? Just when you say "high-power infrared light" my brain thinks "cooking an egg"
  • mbbutler 7y ago
    Would that not risk heating the brain and injuring the neurons?