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[Acoustic reflexometry in presbyacusis (author's transl)].

The authors have studied the relations between crossed and uncrossed acoustic stapedius reflex thresholds in presbyacusic subjects in order to verify whether ageing produces brain stem auditory lesions. The results showed in 55% of the presbyacusics a brain stem disorder characterized by the absence of one, several or all the acoustic reflexes; very often there was only an abnormal difference between crossed and uncrossed acoustic reflex thresholds.