I'm learning about pitch perception, and learned about the case of the missing fundamental.
In the main image in that wikipedia page, it seems like the bottom graph, with the fundamental frequency and its second harmonic removed, that the wave is still very periodic at 100 Hz. Since the Organ of Corti has some area which should be excited when there's a sound wave of frequency 100 Hz, why does this sound wave, which seems periodic at 100 Hz, not directly excite that region of the organ?
Can someone explain the workings of the inner ear and detail on why the missing fundamental does not activate the cochlea? Reversely, how can 100 Hz be heard when the cochlea is not even activated at that frequency?