Quantifying hair bundle motion
The motion of individual hair bundles in the cochlea is a complex function
of both frequency and spatial location.
This image uses color to encode the phase of hair bundle deflection across
the alligator lizard (Elgaria multicarinata) cochlea in response to
a 4 kHz tone.
Blue colors indicate the shortest phase lags, while red colors indicate the
In the apical part of the cochlea (bottom of image), the phase lags are
large, indicating that these hair bundles had a mechanical resonance at
In the basal part of the cochlea, which responds best to frequencies near 4
kHz, the phase lags are significantly shorter.