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Re:What a Sensory Isolation Tank Taught Me About My Brain by amingilani on Sunday January 01, 2017 @04:06PM (#13297348)
Light flashes... Of all the times to have epilepsy, this one is the worst. Sighhhh
Re:What a Sensory Isolation Tank Taught Me About My Brain by visarga on Monday January 02, 2017 @12:16AM (#13299224)
You are supposed to keep your eyes closed and see the flashes through your eyelids. The intensity of light and sound is adjustable for comfort.

It's also related to the https://en.wikipedia.org/wiki/Ganzfeld_effect