The overt voice response in fMRI is critical to aphasia
neuroimaging studies. A commercially available active noise cancelling
microphone makes this application possible. However, an automated measurement
of the voice response time is not reliable due to remaining scanner noises. The
incomplete noise cancellation is due to uneven slice time intervals in the EPI
sequence. The remaining noise was reduced using a post-processing approach
based on a previously published method that used a template of a reference
noise. The response time was measured from the noise-reduced voice signal using
an amplitude and duration threshold after an envelope filtering.
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