Eclipse Additional Information Page 76
3.16 ECochG (Electrochochleargraphy) (if included in your license)
Electrocochleography (ECochG) is a measure of the electrical potentials of the cochlea, which appear within
the first few milliseconds of the response. Typically, the measurement is characterized by the stimulus onset
(baseline), the response of the cochlea to the stimulus (summating potential - SP) and response to the syn-
chronous firing of nerve fibers (action potential - AP). The AP is also known as Wave I. The cochlear micro-
phonic (CM) is also part of the ECochG, but has its own protocol because the settings for measuring CM is
different from the parameters needed to highlight AP and SP.
To have as strong a signal as possible, it is recommended to record from a point as close to the site of gen-
eration as possible.
3.16.1 Protocol Settings for ECochG
It is recommend to use insert phones for the measurement to be able to make a clamped reference meas-
ure. The time window is set to within the first few milliseconds as they are of interest.
For information about the test procedure please refer to the relevant quick guide.
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