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A comment on One in five of us may 'hear' flashes of light. Parent comment

Re:One in five of us may 'hear' flashes of light by maaaats on Wednesday January 18, 2017 @04:37AM (#13425165)
What I described above is called a BTV. This sounds like a Frenzel, which is the one most experienced freedivers use. https://en.m.wikipedia.org/wiki/Ear_clearing
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Re:One in five of us may 'hear' flashes of light by dekhn on Wednesday January 18, 2017 @09:46AM (#13426611)
Huh, I thought this was the val salva maneuver.
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