Chiba Medical Journal Open Access Paper : A preliminary study of delayed auditory feedback and brain activity of bilateral prefrontal region detected by functional near infrared spectroscopy (fNIRS)

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  • A preliminary study of delayed auditory feedback and brain activity of bilateral prefrontal region detected by functional near infrared spectroscopy (fNIRS)

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The effect of delayed auditory feedback on the activity of the bilateral prefrontal region of the brain was investigated by functional near-infrared light spectroscopy (fNIRS). Ten volunteers read aloud a story written in Japanese and alternatively listened to their self-voice through inner ear earphones with no delay or a designated 200-ms delay, repeating the task five times each. The changes in total hemoglobin (Hb) and oxygenated hemoglobin (Oxy-Hb) levels of the prefrontal region and in cutaneous total Hb levels over the mid forehead were monitored. Duration of reading time was also recorded. The mean duration in reading time with delayed feedback was significantly prolonged compared to without the delay. The reading time of the first delayed feedback was significantly prolonged. There was no correlation between cutaneous and cerebral total Hb levels; therefore, fNIRS data were most likely not affected by cutaneous blood flow. Changes in Oxy-Hb levels between delayed and non-delayed feedback of self-voice were not detected in this study. Increase of Oxy-Hb levels in the left prefrontal cortex was observed with and without delayed auditory feedback most likely due to the linguistic-related functional differences between left and right hemispheres of the brain.

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