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Poster A75, Wednesday, November 8, 10:30 – 11:45 am, Harborview and Loch Raven Ballrooms

Phonological Feature Repetition Suppression in the Left Inferior Frontal Gyrus

Kayoko Okada1, William Matchin2, Gregory Hickok3;1Loyola Marymount University, 2University of California, San Diego, 3University of California, Irvine

Models of speech production posit a role for the posterior inferior frontal gyrus (pIFG) in encoding complex phonological representations for speech production, at the syllable or word-level. Here we add further support for such a role with an fMRI experiment of word sequence production using a phonemic similarity manipulation. We adapted and modified previously published experimental paradigm using tongue twisters. Subjects silently articulated words cued by sequential visual presentation that varied in degree of phonological feature overlap in consonant onset position: high overlap (two shared phonological features; e.g. /r/ and /l/) or low overlap (one shared phonological feature, e.g. /r/ and /b/). We found a significant repetition suppression effect in the left pIFG, with increased activation for phonologically dissimilar words compared to similar words.

Topic Area: Phonology and Phonological Working Memory

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