Re: [Phys-L] non-linear ears.

[Brian Whatcott <betwys1@sbcglobal.net>]

 Ah Bernard: your experimental days are not past!         If you use just one ear piece and you are deaf in the other, you will have no opportunity to test the "neural processing" mix that John Denker pointed to.You will be able to detect the augmented fourth in question  however, if the effect grows stronger with tone amplitude and the tones encounter some non-linearity in the audio amplifier  feeding your ear-piece.A similar experimental procedure  for people with binaural hearing involves getting progressively closer to the two audible tone source - a progressively more pronounced effect suggests  the known non-linear response of the basal membranes.
    On Wednesday, October 28, 2020, 03:57:32 PM CDT, bernard cleyet via Phys-l <phys-l@mail.phys-l.org> wrote:  
 
 Now I wish I’d heard or thought of that.  Back in 1959 for a Psych. paper (Psy. 1, UCSB), having only one oscillator I recorded (and played) one tone (1/4” tape) and operated the oscillator at various frequencies to hear the Tartini tritones.  A friend who recorded the student recitals at the Music Academy of the West (Lotte Lehman’s) assisted (his recorder!)  He had good hearing, so identified the notes. 

bc suffering nostalgia.

> On 2020/Oct/09, at 16:29, John Denker via Phys-l <phys-l@mail.phys-l.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:
> https://www.researchgate.net/publication/263815769_Human_cortical_responses_to_slow_and_fast_binaural_beats_reveal_multiple_mechanisms_of_binaural_hearing
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