STEADY but not outstanding progress has been made in both the field of hearing tests and the field of hearing aids. Apparently American instruments are preeminent in the latter field. Contributions from Eastern and Central Europe are still rather scarce. A few original methods of testing hearing are suggested by foreign authors.
TESTS: METHODS, INSTRUMENTS AND PRINCIPLES
Egan1 presents procedures which have been found particularly useful in measurement of intelligibility of speech. These methods are classified into three groups: articulation tests, subjective appraisals and threshold tests. For a quantitative measure of the intelligibility of speech, an announcer reads aloud lists of syllables, words or sentences to a group of listeners, and the percentage of items correctly recorded by these listeners is called the articulation score. This score depends on various factors, such as the nature of the test items that constitute the discrete speech units and the procedures used
LEWY A, SHAPIRO SL, LESHIN N. FUNCTIONAL EXAMINATION OF HEARING. Arch Otolaryngol. 1949;50(3):335–361. doi:10.1001/archotol.1949.00700010345013
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