[Effect of tonic painful squeezing of the finger distal joint on the evoked potential of different spectral frequency ranges in electroencephalogram of humans].
EEG changes caused by the tonic squeezing of the distal joint of the little finger of both hands were investigated on 12 healthy volunteers, age 20-56 (average 35.5). Pain stimulation applied to the right hand was stronger than that applied to the left. Power spectra was measured in 7 EEG ranges: delta--2-4, theta1--4-6, theta2--6-8, alpha1--8-10.5, alpha2--10.5-13, beta1--13-20 and beta2--20-35 Hz. The increase of power in the different areas of the cerebral cortex was a dominant effect of pain influence in beta1 and beta2 as well as in both alpha-ranges. The pain stimulation influenced EEG-parameters bilaterally. It was supposed that increment of alpha-synchronization during peripheral pain reflected the inhibition processes in the thalamo-cortical system. This process most likely limited the area of afferent activation in the cortex. The topography of the significant power changes in alpha1- and alpha2-ranges was different during strong pain as well as after its cessation. Different parameters of functional brain activity during pain stimulation seemed to be reflected in alpha1- and alpha2-rhythms. The significant increment of spectral power in alpha-, beta- and theta2-ranges was demonstrated after cessation of strong pain in comparison to the pre-pain condition. Thus, the changes in EEG parameters reflect the latent and inertial character of the pain effects.
Harkavenko
V V
VV
O. O. Bogomoletz Institute of Physiology, National Academy of Science of Ukraine, Kyiv.
Horkovenko
A V
AV
Man'kivs'ka
O P
OP
Shevko
A M
AM
Kostiukov
O I
OI
D000328:Adult; D004569:Electroencephalography; D005073:Evoked Potentials, Somatosensory / Q000502:physiology*; D005260:Female; D005384:Finger Joint / Q000502:physiology*; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010146:Pain / Q000503:physiopathology*