Signal detection analysis of voice recognition at two delay intervals

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Abstract
Ten male talkers who were raised in Southern California were recorded with a high-quality dynamic microphone while making survey calls on public attitudes towards crime. A week later they were recorded again. A recording of one of the talkers made during the first recording session was played to the listeners. After delays of either one or two weeks the listeners returned and heard all ten second recordings of the talkers. The listeners were told that the voice of the talker they heard the first time might appear once, more than once, or not at all. Listeners were asked to say whether each voice they heard was the voice they heard in the first listening session, and how confident they were in their decision. If they decided a voice was not the voice they had heard earlier, they were asked to indicate how similar it was to that voice. Signal detection analysis showed that listeners maintained an essentially stable hit rate at the cost of an increasing false alarm rate in the two week as opposed to the one week interval.

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