Interesting - I thought she was talking about bad signing making sense to people who knew what the tune was supposed to be, but maybe not. Things fly by pretty fast in her videos; there's often not time to digest her point before she goes on to something else.
I'm not a neuroscientist, but I know that we've had a tonotopic map of the brain for many years: a mapping of frequencies heard to locations in the brain, that can be constructed for any individual. The points lie on a neat curve. And since, often, thinking about a stimulus lights up the same location in the brain associated with perceiving the stimulus, we could conceivably play notes and see what other notes the listener associates with them.
I'm not a neuroscientist, but I know that we've had a tonotopic map of the brain for many years: a mapping of frequencies heard to locations in the brain, that can be constructed for any individual. The points lie on a neat curve. And since, often, thinking about a stimulus lights up the same location in the brain associated with perceiving the stimulus, we could conceivably play notes and see what other notes the listener associates with them.