Experimental Stimulation Deafness

Abstract
Guinea-pigs exposed to loud tones for long periods (e.g., 2,400 c.p.s. at 97 db, 15 hours a day for 40 days) showed losses of auditory sensitivity ranging from 20 to 76 db, affecting primarily the middle of the audible range. The threshold of electrical response was vised to test sensitivity. The losses were correlated with degeneration of part of the organ of Corti [see B. A. 11(1) entry 931].