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Electrocochleography (ECochG)

Electrocochleography (ECochG) is the recording of sound-evoked electrical signals generated in or near the cochlea by its inner hair cells (IHCs; that detect vibration), outer hair cells (OHCs; that assist vibration), dendrites (that respond to each quantum of glutamate released from IHCs with an excitatory postsynaptic potential, or EPSP), and nerve fibers (that conduct action potentials, or APs, to the auditory brainstem). Other cells in the brainstem, midbrain, cortex, and muscles can contribute, but their contributions are smaller and later, and not the main focus of ECochG.

The ECochG signals are generated when ionic currents flow through the cochlea’s sensory hair cells and neurons, producing small ohmic voltage signals in surrounding fluid. The signals can be steady (tonic or DC) or rapidly changing (phasic or AC), ...

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