Frequency theory is a theory of pitch perception that states that the pitch we hear is determined by the frequency of sound waves, with higher frequencies resulting in higher pitches. It suggests that our perception of pitch is based on how fast or slow the neurons in our auditory system fire in response to sound waves.
This theory suggests that different areas along the cochlea respond to different frequencies, with high-frequency sounds stimulating cells near the base and low-frequency sounds stimulating cells near the apex.