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Comparing Cortical Activations For Silent And Overt Speech Using Event‐related FMRI

J. Huang, T. Carr, Yue Cao
Published 2002 · Psychology, Medicine

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At present, functional magnetic resonance imaging (fMRI) of cortical language functions favors “silent” task paradigms with no overt speaking, due to severe motion artifacts in MR images induced by vocalization. To the extent that the neural substrate of silent speaking might differ from that of overt speaking, this is a problem for understanding spoken language. The present study combined event related fMRI methodology with a set of techniques for motion reduction, detection, and correction to further investigate overt speech and compare it to silent speech. The purpose of the study was two‐fold. We aimed to test a multiple‐step image processing protocol involving discrimination and separation of motion‐induced signals from activation‐induced signals and we aimed to use this multi‐step image processing protocol to compare the similarity of activation of cortical pathways potentially relevant to language production during silent and overt speech, focusing on Broca area and primary motor cortex as test cases. If the problem of motion artifact can be handled effectively, fMRI can add greatly to the tools available to investigate human language. Hum. Brain Mapping 15:39–53, 2001. © 2001 Wiley‐Liss, Inc.
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