This study analyzes user corrections of system errors in the TOOT spoken dialogue system. We find that corrections differe from non-corrections prosodically, in ways consistent with hyperarticulated speech, although many corrections are not hyperarticualted. Yet both are misrecognized more frequently than non-corrections though no more likely to be rejected by the system. Corrections more distant from the error they correct tend to exhibit greater prosodic differences, and also to be recognized more poorly. System dialogue strategy affects users' choice of correction type, suggesting that strategy-specific methods of detecting or coaching users on corrections may be useful, Strategies that produce longer tasks but fewer misrecognitions and subsequent corrections are preferred by users.
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