None: Although there are some functional MRIs that can map which part of your brain is active under different circumstances, there are no tests to monitor the frequency of thought.
Answered 5/22/2016
3.9k views
Great idea: Orange&Blue, that's a terrific idea. If you manage to invent such a scan, you'll win Nobel Prizes in Physiology & Medicine AND Physics, not to mention the Galactic Academy of Science's Award for Extreme Cleverness.
Answered 11/28/2017
3.6k views
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