Simulation of the Middle Ear Acoustic Reflex Applied to Damage-Risk for Hearing Produced by Burst Fire
The middle ear muscle reflex may be described as a feedback process which reduces the sound transmission in the middle ear when the level detected in the brain is too high. The effect of this reflex is an increase of the stapedius muscle stiffness, resulting in a change of the stapes response. The contraction process of the stapedius muscle results in a reduction of the middle ear transmission, but also in an increase of resonance and of the cut-off frequency of the middle ear. Both effects, as predicted by the model, appear to be similar to those reported for animals and inferred for humans. The model is implemented in a feedback process, starting from the brain, where a threshold detector elaborates the contraction command and sends it back to the stapedius muscle through a low-pass filter.
KeywordsBasilar Membrane Impulse Noise Ossicular Chain Burst Fire Contraction Process
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