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On 2020/Oct/09, at 16:29, John Denker via Phys-l <firstname.lastname@example.org> wrote:
Tangentially related: Nonlinear auditory cortex.
You can play sine waves of two different frequencies, one in each ear,
and hear the beat note.
This has been known in the literature for eons. It shoots down a great
many simplistic theories about how the auditory system works.
See e.g. the following, and references therein:
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