Adaptation of cortical activity to sustained pressure stimulation on the fingertip

Yoon Gi Chung, Sang Woo Han, Hyung Sik Kim, Soon Cheol Chung, Jang Yeon Park, Christian Wallraven, Sung Phil Kim

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Background: Tactile adaptation is a phenomenon of the sensory system that results in temporal desensitization after an exposure to sustained or repetitive tactile stimuli. Previous studies reported psychophysical and physiological adaptation where perceived intensity and mechanoreceptive afferent signals exponentially decreased during tactile adaptation. Along with these studies, we hypothesized that somatosensory cortical activity in the human brain also exponentially decreased during tactile adaptation. The present neuroimaging study specifically investigated temporal changes in the human cortical responses to sustained pressure stimuli mediated by slow-adapting type I afferents. Methods: We applied pressure stimulation for up to 15s to the right index fingertip in 21 healthy participants and acquired functional magnetic resonance imaging (fMRI) data using a 3T MRI system. We analyzed cortical responses in terms of the degrees of cortical activation and inter-regional connectivity during sustained pressure stimulation. Results: Our results revealed that the degrees of activation in the contralateral primary and secondary somatosensory cortices exponentially decreased over time and that intra- and inter-hemispheric inter-regional functional connectivity over the regions associated with tactile perception also linearly decreased or increased over time, during pressure stimulation. Conclusion: These results indicate that cortical activity dynamically adapts to sustained pressure stimulation mediated by SA-I afferents, involving changes in the degrees of activation on the cortical regions for tactile perception as well as in inter-regional functional connectivity among them. We speculate that these adaptive cortical activity may represent an efficient cortical processing of tactile information.

Original languageEnglish
Article number71
JournalBMC Neuroscience
Volume16
Issue number1
DOIs
Publication statusPublished - 2015 Oct 29

Keywords

  • FMRI
  • Functional connectivity
  • Pressure
  • Somatosensory cortex
  • Tactile adaptation

ASJC Scopus subject areas

  • Neuroscience(all)
  • Cellular and Molecular Neuroscience

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    Chung, Y. G., Han, S. W., Kim, H. S., Chung, S. C., Park, J. Y., Wallraven, C., & Kim, S. P. (2015). Adaptation of cortical activity to sustained pressure stimulation on the fingertip. BMC Neuroscience, 16(1), [71]. https://doi.org/10.1186/s12868-015-0207-x