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Lexical access problems lead to disfluencies in speech.

A picture naming experiment in Dutch tested whether disfluencies in speech can arise from difficulties in lexical access. Speakers described networks consisting of line drawings and paths connecting these drawings, and we manipulated picture name agreement. Consistent with our hypothesis, there were more pauses and more self-corrections in the low name agreement condition than the high name agreement condition, but there was no effect on repetitions. We also considered determiner frequency. There were more self-corrections and more repetitions when the picture name required the less frequent (neuter-gender) determiner "het" than the more frequent (common-gender) determiner "de". These data suggest that difficulties in distinct stages of language production result in distinct patterns of disfluencies.