This is a phenomenon called sine wave speech. It's been well studied in psychology for a long time. What you do is you take a spoken phrase and then you treat it. You basically chop off all the high and low frequencies. So to me, that sounds like a jumbled mess. No idea what it was there. OK. Now we'll go back and play the same sound that I played first,. The exact same sound that you couldn't make head or tail of. That causes us to hear it in a very, very different way.

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