A shadowing task asks a participant to repeat incoming speech aloud while continuing to listen. The delay and accuracy of repetition provide behavioural measures of processing an unfolding speech stream. The task differs from repeating a whole sentence only after the speaker has finished.
William D. Marslen-Wilson and Alan Welsh used shadowing with altered pronunciations in continuous speech. Whether listeners repeated a changed form or fluently restored the expected word depended on aspects of the input and context. Comparison with a mispronunciation detection task helped show that task instructions change which influences appear in the measured response.[ref]
Processing interactions and lexical access during word recognition in continuous speech by William D. Marslen-Wilson and Alan Welsh. Abstract; fluent restorations, syllable position and contextual constraints
A restoration is an observation about the spoken response. It does not alone establish that a listener consciously heard the original sound correctly, nor that every intervening processing stage had the same representation. This makes shadowing useful for testing the time course of spoken word recognition while keeping response production part of the explanation.
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