Decoding four different sound-categories in the auditory cortex using functional near-infrared spectroscopy

Hearing Research
Keum-Shik Hong, Hendrik Santosa

Abstract

The ability of the auditory cortex in the brain to distinguish different sounds is important in daily life. This study investigated whether activations in the auditory cortex caused by different sounds can be distinguished using functional near-infrared spectroscopy (fNIRS). The hemodynamic responses (HRs) in both hemispheres using fNIRS were measured in 18 subjects while exposing them to four sound categories (English-speech, non-English-speech, annoying sounds, and nature sounds). As features for classifying the different signals, the mean, slope, and skewness of the oxy-hemoglobin (HbO) signal were used. With regard to the language-related stimuli, the HRs evoked by understandable speech (English) were observed in a broader brain region than were those evoked by non-English speech. Also, the magnitudes of the HbO signals evoked by English-speech were higher than those of non-English speech. The ratio of the peak values of non-English and English speech was 72.5%. Also, the brain region evoked by annoying sounds was wider than that by nature sounds. However, the signal strength for nature sounds was stronger than that for annoying sounds. Finally, for brain-computer interface (BCI) purposes, the linear discriminant analysis (...Continue Reading

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Citations

Oct 28, 2016·PloS One·Hoang-Dung NguyenYong-Il Shin
Jan 20, 2017·Biomedical Optics Express·Amad Zafar, Keum-Shik Hong
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Dec 18, 2018·Frontiers in Human Neuroscience·M Jawad KhanKeum-Shik Hong
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May 18, 2021·Frontiers in Human Neuroscience·So-Hyeon YooKeum-Shik Hong
Dec 14, 2017··Seong-Woo WooJongseo Park
Jan 31, 2020··Dalin YangKeum-Shik Hong

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