Chung (2006) argues that preposition omission under sprouting (John danced, but I don’t know *(with) who(m)) is degraded as compared to sluicing due to an identity condition requiring all words that are omitted in the sluice to be given in the antecedent. We present a rating and a self-paced reading experiment investigating whether this pattern can be explained by processing mechanisms: The wh phrase is more likely and therefore processed faster (Hale 2001) under sluicing. Our data show that not only mismatches violating Chung’s condition are degraded and read more slowly.
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