Effect of tonic painful squeezing ofthe distal joint of the little finger onthe srectral power of differentfrequency ranges in eeg activity
V. V. Garkavenko, A. V. Gorkovenko,O. P. Mankivska, A. M. Shevko, O. I. Kostyukov
O.O.Bogomoletz Institute of Physiology, National Academyof Science of Ukraine, Kyiv
Abstract
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: ? – 2–4, ?1 – 4–
6, ?2 – 6–8, ?1 – 8–10,5, ?2 – 10,5–13, ?1 – 13–20 and ?2 – 20–
35 Hz. The increase of power in the different areas of the
cerebral cortex was a dominant effect of pain influence in ?1
and ?2 as well as in both ?-ranges. The pain stimulation influ-
enced EEG-parameters bilaterally. It was supposed that incre-
ment of ?-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 ?1- and ?2-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 ?1-
and ?2-rhythms. The significant increment of spectral power
in ?- , ?- and ?2-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
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