The measurement of hearing over the last century was dominated by testing the ability of a subject to detect tonal stimuli in the quiet when using one or other ear. Both National and International Standards proliferated to ensure the comparability of measurements wherever, whenever or however these measurements had been made. Over the last three quarters of that century developments in electrical and electroacoustic technology were able to provide a suitable, user-friendly instrument, the manual pure-tone audiometer, to measure an ear’s sensitivity. Each and every report on the hearing of an individual or a group was almost sure to include a hearing chart (audiogram) measured with such an instrument. As the century wore on technology was able to show not only how the testing could be automated, first by self-recorded audiometry and then by computerized audiometry, but how more information could be extracted, particularly using the interactive and adaptive facilities of computerization .
KeywordsHearing Loss Cochlear Implant Past Half Century Social Indicator Research Hearing Difficulty
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