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J Neurophysiol 53: 636-651, 1985;
0022-3077/85 $5.00
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Journal of Neurophysiology, Vol 53, Issue 3 636-651, Copyright © 1985 by APS

ARTICLES

White noise analysis of cable properties of neuroblastoma cells and lamprey central neurons

L. E. Moore and B. N. Christensen

The integrative properties of two kinds of excitable cells, a cultured neuroblastoma cell and the lamprey giant interneuron, are described using a white-noise impedance method. The impedance functions were fitted with a neuron model consisting of an isopotential soma plus a single equivalent dendritic process, which contained up to 16 equal elements. The frequency-domain characteristics of both the passive and active conductances were used to estimate the dendritic-to-soma areas, the electrotonic length of an equivalent dendrite, the membrane time constant, and the relaxation time constants associated with the voltage-dependent conductances. The effect of differing degrees of synaptic input was simulated by localizing the synaptically activated conductances to the soma, a point at the end of the dendrite, or the entire dendritic membrane.


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