XXVII An Experimental Study of Auditory Damage following Blows to the Head

The clinical features of deafness resulting from blows to the head were discussed in a previous paper," Case histories and audiograms were presented. It was observed that some patients experienced hearing losses even though there was no apparent injury to the bony labyrinth capsule. The hearing losses were most severe for the tones from 3000 to 8000 cps. In severe cases the entire audible frequency range was involved, with the greatest loss for the high frequencies. The audiograms were similar to those of patients suffering from acoustic trauma due to air-borne sounds of high intensity.