A mispronunciation detection task asks listeners to report an altered pronunciation in speech. The manipulation can vary where a change occurs within a word or how strongly the surrounding context predicts the word; responses can be scored for detection and reaction time.
In the 1978 spoken word recognition experiments, listeners in the detection condition saw the original passage while hearing it. The study compared this with a shadowing task, in which listeners repeated ongoing speech. Effects of syllable position appeared in detection, while contextual effects differed between the tasks.[ref]
Processing interactions and lexical access during word recognition in continuous speech by William D. Marslen-Wilson and Alan Welsh. Abstract; written-passage detection and shadowing comparison
The written version supplies information unavailable to an ordinary listener without a transcript. Thus a quick correct response can reflect comparison with that text as well as processing of the incoming sounds. Keeping the altered sound, context and instructions explicit makes the task interpretable rather than treating detection accuracy as a pure measure of one isolated cognitive stage.
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