Interactive

Reflex Simulator

Build an intuition for the admittance trace. Change the stimulus level, the reflex threshold and the rate of decay, and drag the onset and offset markers to see how the recorded waveform responds.

baseline↓ admittancetime (3.0 s window)onoff
Sensation level: 10 dB SLResponse: present (57% of max)
Stimulus level95 dB
Reflex threshold85 dB
Reflex decay0%

Drag the on and off markers to change when the eliciting tone starts and stops.

Things to try

  • Lower the stimulus level below the reflex threshold. The response disappears — there is no reflex below threshold.
  • Raise the stimulus well above threshold. The dip deepens, then saturates: beyond roughly 30 dB of sensation level there is little further growth.
  • Increase the decay control and start the live recording loop. Watch the response fade during the sustained portion — this is what a positive decay result looks like.
  • Drag the onset and offset markers closer together. A very brief stimulus may not allow the response to reach full amplitude before it begins to recover.
The simulator is a teaching idealisation. Real recordings carry physiological noise and artefact; the criterion of a clean, repeatable, time-locked deflection of at least 0.02 mmho still applies.