Among 450 vestibular examinations with electronystagmography, the author found 10 cases of bilateral loss of excitability. However, such a diagnosis must be done with great caution. A flat line does not always mean areflexy. The same patient may have a normal or a subnormal excitability at the rotatory test with a total absence of caloric nystagmus. In this case, a subjective sensation whose threshold is even lower, also appears. The diagnosis of bilateral labyrinth areflexy should only be done in presence of a neck torsion nystagmus. The auditory function is frequently disturbed, but not always; a total deafness is only present in cases of acquired deafmutism. The etiology is quite variable.

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