Corticokinematic coherence is stronger to regular than irregular proprioceptive stimulation of the hand
Mujunen, T., Nurmi, T., & Piitulainen, H. (2021). Corticokinematic coherence is stronger to regular than irregular proprioceptive stimulation of the hand. Journal of Neurophysiology, 126(2), 550-560. https://doi.org/10.1152/jn.00095.2021
Julkaistu sarjassa
Journal of NeurophysiologyPäivämäärä
2021Oppiaine
Monitieteinen aivotutkimuskeskusHyvinvoinnin tutkimuksen yhteisöCentre for Interdisciplinary Brain ResearchSchool of WellbeingTekijänoikeudet
© 2021 The Authors
Proprioceptive afference can be investigated using corticokinematic coherence (CKC), which indicates coupling between limb kinematics and cortical activity. CKC has been quantified using proprioceptive stimulation (movement actuators) with fixed inter-stimulus interval (ISI). However, it is unclear how regularity of the stimulus sequence (jitter) affects CKC strength. Eighteen healthy volunteers (16 right-handed, 27.8±5.0 yrs, 7 females) participated in magnetoencephalography (MEG) session in which their right-index finger was continuously moved at ~3-Hz with constant 333 ms ISI or with 20% jitter (ISI 333±66 ms) using a pneumatic-movement actuator. Three minutes of data per condition was collected. Finger kinematics were recorded with a 3-axis accelerometer. CKC strength was defined as the peak coherence value in the Rolandic MEG gradiometer pair contralateral to the movement at 3-Hz. Both conditions resulted in significant coherence peaking in the gradiometers over the primary sensorimotor cortex. Constant stimulation yielded stronger CKC at 3 Hz (0.78±0.11 vs. 0.66±0.13, p<0.001) and its first harmonic (0.60±0.19 vs. 0.27±0.11, p<0.001) than irregular stimulation. Similarly, the respective sustained-movement evoked field was also stronger for constant stimulation. The results emphasize the importance of temporal stability of the proprioceptive stimulation sequence when quantifying CKC strength. The weaker CKC during irregular stimulation can be explained with temporal and thus spectral scattering of the paired peripheral and cortical events beyond the mean stimulation frequency. This impairs the signal-to-noise ratio of respective MEG signal and thus CKC strength. When accurately estimating and following changes in CKC strength, we suggest using precise movement actuators with constant stimulation sequence.
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Julkaisija
American Physiological SocietyISSN Hae Julkaisufoorumista
0022-3077Asiasanat
Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/99025229
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Suomen AkatemiaRahoitusohjelmat(t)
Akatemiatutkija, SA; Akatemiatutkijan tutkimuskulut, SALisätietoja rahoituksesta
This study has been supported by the Academy of Finland ”Brain changes across the life-span” profiling funding to University of Jyväskylä. HP was supported by Academy of Finland (grants #296240, #326988, #307250 and #327288) to HP and Jane and Aatos Erkko FoundationLisenssi
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