Abstract
A balanced experiment is described, the aims of which were to establish the difference of hearing thresholds by fixed-frequency self-recording audiometry and to make a contribution to further audiometric standardization. The difference is confounded with learning and order effects. Elimination of these variables results in a value of 0 dB at the first frequency tested and 3 dB at all other frequencies, self-recorded thresholds being the lower. Two distinct mechanisms in the learning process are apparent. Some subjects exhibited large initial errors in the direction of apparent hearing loss, particularly at 025 and 8 kHz by self-recording and at 6 kHz by manual audiometry. Subjects improved progressively with practice; on average the threshold shift amounted to 1 dB within the first session and ½ dB on a subsequent occasion. A further improvement occurred between the tests.
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