TY  - JOUR
AU  - Spasić, Slađana
PY  - 2010
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/382
AB  - The surrogate data test for nonlinearity has been used in order to establish the existence of nonlinear dynamics and justify the use of nonlinear tools in time series analysis. We applied Higuchi fractal dimension and third-order correlation function on the rat electrocortical activity as discriminative statistics. Our particular interest in this study was to investigate the nonlinearity of cerebellar electrocortical signals in rat model of acute and repeated cerebral cortical injury. We performed the surrogate data test for nonlinearity by using the algorithm of statically transformed autoregressive process (STAP) to generate the surrogate data. Surrogate data test for nonlinearity indicated that cerebellar cortical signals have mostly nonlinear properties during all experimental conditions in the model of repeated cerebral cortical injury. We conclude that results of testing nonlinearity by Higuchi fractal dimension as discriminative statistic are more stable than those obtained by the third-order correlation.
PB  - Elsevier Science Bv, Amsterdam
T2  - Signal Processing
T1  - Surrogate data test for nonlinearity of the rat cerebellar electrocorticogram in the model of brain injury
EP  - 3025
IS  - 12
SP  - 3015
VL  - 90
DO  - 10.1016/j.sigpro.2010.04.005
ER  - 

@article{
author = "Spasić, Slađana",
year = "2010",
abstract = "The surrogate data test for nonlinearity has been used in order to establish the existence of nonlinear dynamics and justify the use of nonlinear tools in time series analysis. We applied Higuchi fractal dimension and third-order correlation function on the rat electrocortical activity as discriminative statistics. Our particular interest in this study was to investigate the nonlinearity of cerebellar electrocortical signals in rat model of acute and repeated cerebral cortical injury. We performed the surrogate data test for nonlinearity by using the algorithm of statically transformed autoregressive process (STAP) to generate the surrogate data. Surrogate data test for nonlinearity indicated that cerebellar cortical signals have mostly nonlinear properties during all experimental conditions in the model of repeated cerebral cortical injury. We conclude that results of testing nonlinearity by Higuchi fractal dimension as discriminative statistic are more stable than those obtained by the third-order correlation.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Signal Processing",
title = "Surrogate data test for nonlinearity of the rat cerebellar electrocorticogram in the model of brain injury",
pages = "3025-3015",
number = "12",
volume = "90",
doi = "10.1016/j.sigpro.2010.04.005"
}

Spasić, S.. (2010). Surrogate data test for nonlinearity of the rat cerebellar electrocorticogram in the model of brain injury. in Signal Processing
Elsevier Science Bv, Amsterdam., 90(12), 3015-3025.
https://doi.org/10.1016/j.sigpro.2010.04.005

Spasić S. Surrogate data test for nonlinearity of the rat cerebellar electrocorticogram in the model of brain injury. in Signal Processing. 2010;90(12):3015-3025.
doi:10.1016/j.sigpro.2010.04.005 .

Spasić, Slađana, "Surrogate data test for nonlinearity of the rat cerebellar electrocorticogram in the model of brain injury" in Signal Processing, 90, no. 12 (2010):3015-3025,
https://doi.org/10.1016/j.sigpro.2010.04.005 . .

TY  - JOUR
AU  - Jovanović, Aleksandar
AU  - Perović, Aleksandar
AU  - Klonowski, Wlodzimierz
AU  - Duch, Wlodzislaw
AU  - Đorđević, Zoran
AU  - Spasić, Slađana
PY  - 2010
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/381
AB  - In this article structures in biological signals are treated. The simpler-directly visible in the signals, which still demand serious methods and algorithms in the feature detection, similarity investigation and classification. The major actions in this domain are of geometric, thus simpler sort, though there are still hard problems related to simple situations. The other large class of less simple signals unsuitable for direct geometric or statistic approach, are signals with interesting frequency components and behavior, those suitable for spectroscopic analysis. Semantics of spectroscopy, spectroscopic structures and research demanded operations and transformations on spectra and time spectra are presented. The both classes of structures and related analysis methods and tools share a large common set of algorithms, all of which aiming to the full automatization. Some of the signal features present in the brain signal patterns are demonstrated, with the contexts relevant in BCI, brain computer interfaces. Mathematical representations, invariants and complete characterization of structures in broad variety of biological signals are in the central focus.
PB  - Springer, New York
T2  - Journal of Signal Processing Systems for Signal Image and Video Technology
T1  - Detection of Structural Features in Biological Signals
EP  - 129
IS  - 1
SP  - 115
VL  - 60
DO  - 10.1007/s11265-009-0407-7
ER  - 

@article{
author = "Jovanović, Aleksandar and Perović, Aleksandar and Klonowski, Wlodzimierz and Duch, Wlodzislaw and Đorđević, Zoran and Spasić, Slađana",
year = "2010",
abstract = "In this article structures in biological signals are treated. The simpler-directly visible in the signals, which still demand serious methods and algorithms in the feature detection, similarity investigation and classification. The major actions in this domain are of geometric, thus simpler sort, though there are still hard problems related to simple situations. The other large class of less simple signals unsuitable for direct geometric or statistic approach, are signals with interesting frequency components and behavior, those suitable for spectroscopic analysis. Semantics of spectroscopy, spectroscopic structures and research demanded operations and transformations on spectra and time spectra are presented. The both classes of structures and related analysis methods and tools share a large common set of algorithms, all of which aiming to the full automatization. Some of the signal features present in the brain signal patterns are demonstrated, with the contexts relevant in BCI, brain computer interfaces. Mathematical representations, invariants and complete characterization of structures in broad variety of biological signals are in the central focus.",
publisher = "Springer, New York",
journal = "Journal of Signal Processing Systems for Signal Image and Video Technology",
title = "Detection of Structural Features in Biological Signals",
pages = "129-115",
number = "1",
volume = "60",
doi = "10.1007/s11265-009-0407-7"
}

Jovanović, A., Perović, A., Klonowski, W., Duch, W., Đorđević, Z.,& Spasić, S.. (2010). Detection of Structural Features in Biological Signals. in Journal of Signal Processing Systems for Signal Image and Video Technology
Springer, New York., 60(1), 115-129.
https://doi.org/10.1007/s11265-009-0407-7

Jovanović A, Perović A, Klonowski W, Duch W, Đorđević Z, Spasić S. Detection of Structural Features in Biological Signals. in Journal of Signal Processing Systems for Signal Image and Video Technology. 2010;60(1):115-129.
doi:10.1007/s11265-009-0407-7 .

Jovanović, Aleksandar, Perović, Aleksandar, Klonowski, Wlodzimierz, Duch, Wlodzislaw, Đorđević, Zoran, Spasić, Slađana, "Detection of Structural Features in Biological Signals" in Journal of Signal Processing Systems for Signal Image and Video Technology, 60, no. 1 (2010):115-129,
https://doi.org/10.1007/s11265-009-0407-7 . .

TY  - JOUR
AU  - Grbic, G.
AU  - Culic, M.
AU  - Martać, Ljiljana
AU  - Soković, Marina
AU  - Spasić, Slađana
AU  - Doković, D.
PY  - 2008
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/239
AB  - The aim of our study was to investigate the effect of camphor essential oil on rat cerebral cortex activity by fractal analysis. Fractal dimension (FD) values of the parietal electrocortical activity were calculated before and after intraperitoneal administration of camphor essential oil (450-675 mu l/kg) in anesthetized rats. Camphor oil induced seizure-like activity with single and multiple spiking of high amplitudes in the parietal electrocorticogram and occasional clonic limb convulsions. The FD values of cortical activity after camphor oil administration increased on the average. Only FD values of ictal ECoG sequences were lower than those before camphor oil administration.
PB  - Srpsko biološko društvo, Beograd, i dr.
T2  - Archives of Biological Sciences
T1  - Effect of camphor essential oil on rat cerebral cortex activity as manifested by fractal dimension changes
EP  - 553
IS  - 4
SP  - 547
VL  - 60
DO  - 10.2298/ABS0804547G
ER  - 

@article{
author = "Grbic, G. and Culic, M. and Martać, Ljiljana and Soković, Marina and Spasić, Slađana and Doković, D.",
year = "2008",
abstract = "The aim of our study was to investigate the effect of camphor essential oil on rat cerebral cortex activity by fractal analysis. Fractal dimension (FD) values of the parietal electrocortical activity were calculated before and after intraperitoneal administration of camphor essential oil (450-675 mu l/kg) in anesthetized rats. Camphor oil induced seizure-like activity with single and multiple spiking of high amplitudes in the parietal electrocorticogram and occasional clonic limb convulsions. The FD values of cortical activity after camphor oil administration increased on the average. Only FD values of ictal ECoG sequences were lower than those before camphor oil administration.",
publisher = "Srpsko biološko društvo, Beograd, i dr.",
journal = "Archives of Biological Sciences",
title = "Effect of camphor essential oil on rat cerebral cortex activity as manifested by fractal dimension changes",
pages = "553-547",
number = "4",
volume = "60",
doi = "10.2298/ABS0804547G"
}

Grbic, G., Culic, M., Martać, L., Soković, M., Spasić, S.,& Doković, D.. (2008). Effect of camphor essential oil on rat cerebral cortex activity as manifested by fractal dimension changes. in Archives of Biological Sciences
Srpsko biološko društvo, Beograd, i dr.., 60(4), 547-553.
https://doi.org/10.2298/ABS0804547G

Grbic G, Culic M, Martać L, Soković M, Spasić S, Doković D. Effect of camphor essential oil on rat cerebral cortex activity as manifested by fractal dimension changes. in Archives of Biological Sciences. 2008;60(4):547-553.
doi:10.2298/ABS0804547G .

Grbic, G., Culic, M., Martać, Ljiljana, Soković, Marina, Spasić, Slađana, Doković, D., "Effect of camphor essential oil on rat cerebral cortex activity as manifested by fractal dimension changes" in Archives of Biological Sciences, 60, no. 4 (2008):547-553,
https://doi.org/10.2298/ABS0804547G . .

TY  - JOUR
AU  - Grbić, Gordana
AU  - Ćulić, Milka
AU  - Martać, Ljiljana
AU  - Kesić, Srđan Ž.
AU  - Soković, Marina
AU  - Spasić, Slađana
AU  - Đoković, Dejan
PY  - 2006
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2945
AB  - We have decided to detect the seizure brain activity induced by camphor essential oil in rats, as there are still reports of severe intoxication in humans by camphor. The experiments were performed on adult Wistar male rats. The surgery and the acute electrophysiological recordings were done under pentobarbital sodium anesthesia. Local field potentials of cerebral parietal cortex were recorded. The rats were injected by camphor essential oil (150-675 μl/kg b.w., in 1 ml of saline, i.p). We analyzed by Fast Fourier Transform the digitized electrocortical signals before and up 2-3 h after essential oil administration at the sampling rate of 256 Hz. There was a great increase of the mean total power spectra, a relative increase of the power in delta range and decreases of theta and beta ranges when seizural activity with spikes and waves of large amplitude occurred at the level of cerebral cortex 5-30 min after administration of camphor oil at doses >300 μl/kg b.w. It is necessary to investigate further the dose dependent effectiveness of each terpenoid constituent of camphor essential oil on brain activity in order to elucidate the relative safety of the usage of essential oils with these terpenoids.
PB  - Serbian Union of Biological Sciences
T2  - Acta biologica serbica - serija C: Acta physiologica et pharmacologica serbica
T1  - Trovanje kamforom - spektralna analiza aktivnosti mozga pacova
T1  - Camphor oil poisoning: Spectral analysis of rat brain activity
EP  - 238
IS  - 3
SP  - 233
VL  - 42
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2945
ER  - 

@article{
author = "Grbić, Gordana and Ćulić, Milka and Martać, Ljiljana and Kesić, Srđan Ž. and Soković, Marina and Spasić, Slađana and Đoković, Dejan",
year = "2006",
abstract = "We have decided to detect the seizure brain activity induced by camphor essential oil in rats, as there are still reports of severe intoxication in humans by camphor. The experiments were performed on adult Wistar male rats. The surgery and the acute electrophysiological recordings were done under pentobarbital sodium anesthesia. Local field potentials of cerebral parietal cortex were recorded. The rats were injected by camphor essential oil (150-675 μl/kg b.w., in 1 ml of saline, i.p). We analyzed by Fast Fourier Transform the digitized electrocortical signals before and up 2-3 h after essential oil administration at the sampling rate of 256 Hz. There was a great increase of the mean total power spectra, a relative increase of the power in delta range and decreases of theta and beta ranges when seizural activity with spikes and waves of large amplitude occurred at the level of cerebral cortex 5-30 min after administration of camphor oil at doses >300 μl/kg b.w. It is necessary to investigate further the dose dependent effectiveness of each terpenoid constituent of camphor essential oil on brain activity in order to elucidate the relative safety of the usage of essential oils with these terpenoids.",
publisher = "Serbian Union of Biological Sciences",
journal = "Acta biologica serbica - serija C: Acta physiologica et pharmacologica serbica",
title = "Trovanje kamforom - spektralna analiza aktivnosti mozga pacova, Camphor oil poisoning: Spectral analysis of rat brain activity",
pages = "238-233",
number = "3",
volume = "42",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2945"
}

Grbić, G., Ćulić, M., Martać, L., Kesić, S. Ž., Soković, M., Spasić, S.,& Đoković, D.. (2006). Trovanje kamforom - spektralna analiza aktivnosti mozga pacova. in Acta biologica serbica - serija C: Acta physiologica et pharmacologica serbica
Serbian Union of Biological Sciences., 42(3), 233-238.
https://hdl.handle.net/21.15107/rcub_rimsi_2945

Grbić G, Ćulić M, Martać L, Kesić SŽ, Soković M, Spasić S, Đoković D. Trovanje kamforom - spektralna analiza aktivnosti mozga pacova. in Acta biologica serbica - serija C: Acta physiologica et pharmacologica serbica. 2006;42(3):233-238.
https://hdl.handle.net/21.15107/rcub_rimsi_2945 .

Grbić, Gordana, Ćulić, Milka, Martać, Ljiljana, Kesić, Srđan Ž., Soković, Marina, Spasić, Slađana, Đoković, Dejan, "Trovanje kamforom - spektralna analiza aktivnosti mozga pacova" in Acta biologica serbica - serija C: Acta physiologica et pharmacologica serbica, 42, no. 3 (2006):233-238,
https://hdl.handle.net/21.15107/rcub_rimsi_2945 .