So there are 16,000 neurons in the ear that perform something like FFT with 16k bins over a 100ms sliding time frame. Now imagine there is a 2nd layer where each neuron is watching the corresponding neuron in the 1st layer and when that one fires, it looks up what other neurons are firing at the same time. This correlation event is recorded somewhere inside the neuron. After listening to lots of sounds, the 2nd layer neuron will notice a simple pattern: when its frequency fires, neurons corresponding to 2x, 3x, etc. frequencies also fire. As a result, the 2nd layer neuron fires upon seeing a harmonic pattern.
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So there are 16,000 neurons in the ear that perform something like FFT with 16k bins over a 100ms sliding time frame. Now imagine there is a 2nd layer where each neuron is watching the corresponding neuron in the 1st layer and when that one fires, it looks up what other neurons are firing at the same time. This correlation event is recorded somewhere inside the neuron. After listening to lots of sounds, the 2nd layer neuron will notice a simple pattern: when its frequency fires, neurons corresponding to 2x, 3x, etc. frequencies also fire. As a result, the 2nd layer neuron fires upon seeing a harmonic pattern.