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This study used fMRI to investigate the neural basis of the tongue-twister effect in a sentence
comprehension task. Participants silently read sentences equated for the syntactic
structure and the lexical frequency of the constituent words, but differing in the proportion of
words that shared similar initial phonemes. The manipulation affected not only the reading
times and comprehension performance, but also the amount of activation seen in a number of
language-related cortical areas. The effect was not restricted to cortical areas known to be
involved in articulatory speech programming or rehearsal processes (the inferior frontal gyrus
and anterior insula), but also extended to areas associated with other aspects of language
processing (inferior parietal cortex) associated with phonological processing and storage.

2002 Elsevier Science (USA). All rights reserved..