Function curves providing a correlation between CF (characteristic frequency) and protrusion depth within the IC. A: A normal distribution can be observed within the control CF map. CF and depth have a positive trend, resulting in higher frequencies the deeper the protrusions within the IC. B: Short recovery group shows more of a randomized pattern with dispersed responses above and below 4 kHz creating a gap specifically at that frequency. C: Long recovery group exhibited the same type of gap at 4 kHz, but at a reduced level showing signs of recovery.