But if we artificially create a sound with energy at 200 Hz, 300 Hz, 400 Hz, and 500 Hz (leaving off the fundamental), we still perceive it as having a pitch of 100 Hz. We don’t perceive it as having a pitch of 200 Hz, because our brain “knows” that a normal, harmonic sound with a pitch of 200 Hz would have an overtone series of 200 Hz, 400 Hz, 600 Hz, 800 Hz, etc. We can also fool the brain by playing sequences that deviate from the overtone series such as this: 100 Hz, 210 Hz, 302 Hz, 405 Hz, etc. In cases like these, the perceived pitch shifts away from 100 Hz in a compromise between what
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