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Why are two-syllable words used in speech reception threshold testing?

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In speech reception threshold (SRT) testing, audiologists use words with a spondee pattern—two-syllable words where both syllables are spoken with equal emphasis, such as "railway" or "football"—to determine the lowest intensity level at which a person can correctly identify and repeat half of the words presented.1

These specific words are utilized because their balanced stress pattern provides a consistent and reliable stimulus for measuring the threshold of speech intelligibility. This measurement typically correlates closely with the average of an individual's pure-tone hearing thresholds at 500, 1,000, and 2,000 Hz, offering a practical assessment of how well a patient can hear and understand conversational speech.1