Although there was some evidence that partially intelligible stimuli elicited the strongest responses in the left inferior frontal cortex, a region previous studies have suggested is associated with effortful listening in adults, this effect did not reach statistical significance.
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Investigating Cortical Responses to Noise-Vocoded Speech in Children with Normal Hearing Using Functional Near-Infrared Spectroscopy (fNIRS).
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Our data showed a clear trend in this direction (“inverted-U” response profile across stimulus intelligibility levels), however the effect did not reach statistical significance in any individual fNIRS channel after correcting for multiple comparisons.