Why do two headphones make the music play in the top of my head? A left or right headphone on its own is noticeably left or right, but as you place the second one in, rather than it sounding like it’s coming into each ear simultaneously, it just sort of like, swims up in the top. Why?
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While you detect whether sound is coming from your left or right by timing differences, you detect whether sound is coming from in front, behind, above or below you by the way the sound is distorted by the structure of your outer ears. Feeding the sound direct into your ear canal with a ear bud completely throws this out. So you can’t detect anything about where this sound is coming from, and your brain giving you the idea that it is coming from the top of your head is quite common.
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