Receptive organelles, or hair bundles, of the inner ear hair cells have increased sensitivity for signal detection due to added noise creating nonlinear stochastic resonance.

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"In this multicellular model for peripheral auditory coding the enhancing effect of Brownian noise on the high sensitivity of the auditory system was demonstrated. It was shown that the noise quantitatively accounts for the detection of weak pure tones which would otherwise either evoke receptor potentials too small to elicit spikes at all or too few spikes sufficient for determination of the stimulus frequency." (Gebeshuber 2000:1865)

Journal article
The influence of stochastic behavior on the human threshold of hearingChaos, Solitons & FractalsApril 23, 2003
Ilse Christine Gebeshuber

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