Hearing investigation in relation to the duration of acoustic signals.

The present study was designed to test the peculiarities of hearing perception on dependence of acoustic signal duration both in normal hearing subjects and in those with conductive and sensorineural deafness. It was found that in patients with pure conductive hearing impairment the shortest time necessary for tonal sensation of the sound signal corresponded to normal values. However, in 35 out of 63 patients investigated with cochlear deafness, it was found that the signal had to be of longer duration before pitch could be distinguished from a click.