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Nadav Stoppelman, Tamar Harpaz and Michal Ben-Shachar Do not throw out the baby with the bath water: choosing an effective baseline for a functional localizer of speech processing Brain and Behavior 3

Version of Record online: 17 FEB 2013 | DOI: 10.1002/brb3.129

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We compare functional magnetic resonance imaging (fMRI) responses to speech against two commonly used baselines: Reversed speech and signal correlated noise (SCN). The results show that Reversed Speech removes much of the speech responses in frontal and temporal areas, while SCN maintains these responses and only removes those in primary auditory cortex. We further show that the response to reversed speech in left inferior frontal gyrus decays significantly faster than the response to speech, suggesting that this response reflects bottom up activation of speech analysis processes followed up by top-down attenuation once the signal is classified as non-speech.

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