A Dual Probe and Two Tones Reveal Dual Waves in the Cochlea

The cochlea is a supercharged physiological sensor. When we compare the cochlea to the retina for example, the cochlea is much more sensitive and can detect signal at only 10 times the noise level compared to 100 times the noise level for the retina. Its dynamic range covers six orders of magnitude compared to two orders of magnitude for the retina. The cochlea can discriminate ∼2000 tones compared to 200 hues for the retina. The cochlea responds to 10 frequency doublings compared to two for the retina, and it can respond four-orders-of-magnitude faster.