Uncoiled cochlea: basilar membrane displacement
Base (stapes) on the left, apex (helicotrema) on the right. Human place–frequency map (Greenwood, 1990), 35 mm length. Dashed lines show the travelling-wave envelope.
BM displacement
Envelope
OHC health along the cochlea
Probe place
Organ of Corti at the probe place
Radial cross-section. BM up (toward scala vestibuli) deflects stereocilia toward the tallest row and opens transduction channels.
Transduction at the probe place
Slowed time, most recent on the right.
Excitation pattern
Peak BM response (dB, model units) at every place. The dotted line is the level needed to drive the auditory nerve.
Input–output at probe CF
BM response to a tone at the probe's characteristic frequency.