caa a22 4500 465783317 CHVBK 20180323112001.0 cr unu---uuuuu 170327e19901101xx s 000 0 eng 10.1007/BF02442604 doi (NATIONALLICENCE)springer-10.1007/BF02442604 Power spectra of single infinite fibre extracellular potentials recorded by a bipolar electrode [Elektronische Daten] [Z. Lateva, G. Dimitrov, N. Dimitrova] The power spectra of bipolarly recorded extracellular action potentials (EAPs) generated by an infinite, homogeneous, excitable fibre in an infinite, resistive, isotropic and homogeneous volume conductor were theoretically analysed. The changes in the power spectrum of EAP, which occurred as a result of alterations in the propagation velocity v and duration Tin of the intracellular action potential IAP, were analytically determined for bipolar parallel and radial electrodes with a small interpole distance. It was found that the sensitivity of the spectral characteristics to alteration in v, Tin and/or the IAP asymmetry substantially depends on the fibre-electrode distance; information on the IAP fast changes, that seems to be lost in unipolar recording as a result of the filtering effect of the fibre-electrode distance, can be restored. The orientation of the recording electrode need not be taken into account when a qualitative analysis is carried out, but when a quantitative analysis has to be performed, then the electrode orientation has a significant influence. A method is suggested for determination of the fibres' orientation by means of the spectrum of EAPs recorded bipolarly. The selectivity of the bipolar electrodes is analysed. IFMBE, 1990 Bipolar recording nationallicence Extracellular action potential nationallicence Fibre-electrode distance nationallicence Intracellular action potential duration nationallicence Power spectrum nationallicence Propagation velocity nationallicence Lateva Z. CLBA, Bulgarian Academy of Sciences, G. Bontchev str., bl. 105, 1113, Sofia, Bulgaria aut Dimitrov G. CLBA, Bulgarian Academy of Sciences, G. Bontchev str., bl. 105, 1113, Sofia, Bulgaria aut Dimitrova N. CLBA, Bulgarian Academy of Sciences, G. Bontchev str., bl. 105, 1113, Sofia, Bulgaria aut Medical and Biological Engineering and Computing Kluwer Academic Publishers 28/6(1990-11-01), 537-543 0140-0118 28:6<537 1990 28 11517 https://doi.org/10.1007/BF02442604 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02442604 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lateva Z. CLBA, Bulgarian Academy of Sciences, G. Bontchev str., bl. 105, 1113, Sofia, Bulgaria aut NATIONALLICENCE 700 1- Dimitrov G. CLBA, Bulgarian Academy of Sciences, G. Bontchev str., bl. 105, 1113, Sofia, Bulgaria aut NATIONALLICENCE 700 1- Dimitrova N. CLBA, Bulgarian Academy of Sciences, G. Bontchev str., bl. 105, 1113, Sofia, Bulgaria aut NATIONALLICENCE 773 0- Medical and Biological Engineering and Computing Kluwer Academic Publishers 28/6(1990-11-01), 537-543 0140-0118 28:6<537 1990 28 11517 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer