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Kim, Sung-Phil
Brain-Computer Interface (BCI) Lab
Research Interests
  • Brain-computer interface, Statistical Signal Processing, Neural Code, Neuromarketing

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Frequency-dependent patterns of somatosensory cortical responses to vibrotactile stimulation in humans: A fMRI study

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Title
Frequency-dependent patterns of somatosensory cortical responses to vibrotactile stimulation in humans: A fMRI study
Author
Chung, Yoon GiKim, JunsukHan, Sang WooKim, Hyung-SikChoi, Mi HyunChung, Soon-CheolPark, Jang-YeonKim, Sung-Phil
Issue Date
2013-04
Publisher
ELSEVIER SCIENCE BV
Citation
BRAIN RESEARCH, v.1504, pp.47 - 57
Abstract
In the human mechanosensation system, rapidly adapting afferents project sensory signals of flutter (5-50 Hz) to the contralateral primary somatosensory cortex (51) and bilateral secondary somatosensory cortex (S2) whereas Pacinian afferents project sensory signals of vibration (50-400 Hz) to bilateral S2. However, it remains largely unknown how somatosensory cortical activity changes as a function of vibrotactile frequency. This functional magnetic resonance imaging (fMRI) study investigated frequency dependency of somatosensory cortical activity in humans by applying vibrotactile stimulation with various frequencies (20-200 Hz) to the index finger. We found more frequency-dependent voxels in the upper bank of the lateral sulcus (LS) of S2 than in Si and the posterior parietal cortex of S2. Our statistical spatial clustering analysis showed that two groups of positively or negatively frequency-dependent voxels formed distinct clusters, most clearly in the LS. Using a cortical separability index, we reaffirmed that somatosensory cortical activity was most separable at 50 Hz, previously known to demarcate flutter and vibration. Our results suggest that the LS (S2) may play an important role in processing vibrotactile frequency information and that the somatosensory cortex may include spatially localized neural assemblies specialized to higher or lower vibrotactile frequency.
URI
https://scholarworks.unist.ac.kr/handle/201301/9544
DOI
10.1016/j.brainres.2013.02.003
ISSN
0006-8993
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BME_Journal Papers
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