Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Fluctuations and interactions between brain waves during deep and shallow anesthesia
AU - Musizza, Bojan
AU - Bajrović, Fajko F.
AU - Petrovčič, Janko
AU - Stefanovska, Aneta
AU - Ribarič, Samo
PY - 2012/3
Y1 - 2012/3
N2 - Using gold plated electrodes, inserted into the rat's head above the dura of the left and right parietal cortex, we recorded EEG during deep and shallow anesthesia with either pentobarbital (PB) or ketamine-xylazine (KX). The fluctuations in time series were then analyzed using wavelet transforms and the spectral power was determined within 7 frequency intervals (slow wave 2, S2, 0.0067-0.0167 Hz; slow wave 1, S1, 0.02-0.19 Hz; delta, 0.2-3.9 Hz; theta, 4-7.9 Hz; alpha, 8-12.9 Hz; beta, 13-24.9 Hz and gamma, 25-34.9 Hz). In addition, the coupling strengths between individual oscillatory components during deep and shallow anesthesia were evaluated for both anesthetics. We show specific changes for both anesthetics indicating that during deep anesthesia PB reduces high and low frequency activity (0.2-35 Hz) and enhances coupling especially between delta, theta and alpha waves, while KX reduces low frequency activity (0.005 to 0.2 Hz) and enhances coupling between frequency waves alpha, beta and gamma. Our results, using two anesthetics known to block different ion channels, provide an insight into brain dynamics and could have wide implications in creating biomarkers for detecting various neurophysiological modifications, such as in Alzheimer and Parkinson's disease or Autism spectrum disorder, as well as in providing more realistic models of brain dynamics.
AB - Using gold plated electrodes, inserted into the rat's head above the dura of the left and right parietal cortex, we recorded EEG during deep and shallow anesthesia with either pentobarbital (PB) or ketamine-xylazine (KX). The fluctuations in time series were then analyzed using wavelet transforms and the spectral power was determined within 7 frequency intervals (slow wave 2, S2, 0.0067-0.0167 Hz; slow wave 1, S1, 0.02-0.19 Hz; delta, 0.2-3.9 Hz; theta, 4-7.9 Hz; alpha, 8-12.9 Hz; beta, 13-24.9 Hz and gamma, 25-34.9 Hz). In addition, the coupling strengths between individual oscillatory components during deep and shallow anesthesia were evaluated for both anesthetics. We show specific changes for both anesthetics indicating that during deep anesthesia PB reduces high and low frequency activity (0.2-35 Hz) and enhances coupling especially between delta, theta and alpha waves, while KX reduces low frequency activity (0.005 to 0.2 Hz) and enhances coupling between frequency waves alpha, beta and gamma. Our results, using two anesthetics known to block different ion channels, provide an insight into brain dynamics and could have wide implications in creating biomarkers for detecting various neurophysiological modifications, such as in Alzheimer and Parkinson's disease or Autism spectrum disorder, as well as in providing more realistic models of brain dynamics.
KW - Coupled oscillators
KW - anaesthesia
KW - Coupling
KW - EEG
KW - brain dynamics
KW - Wavelet transform
KW - coupling strength
KW - power spectrum
KW - Interactions
U2 - 10.1142/S0219477512400184
DO - 10.1142/S0219477512400184
M3 - Journal article
VL - 11
JO - Fluctuation and Noise Letters
JF - Fluctuation and Noise Letters
SN - 0219-4775
IS - 1
M1 - 1240018
ER -