Electrical impedance of cat brain with cold-induced edema

Value], [No; Kito, Go; Zuiderve.F, [No Value]; Buiter, D; Vanderme.J, [No Value]

doi:10.1016/0014-4886(73)90103-9

Cited by 14 publications

(1 citation statement)

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“…Compared to a four-electrode system the two-electrode approach is sensi tive to changes at the electrode interface which may be caused by pres sure on the electrodes or relative movement between the electrodes where this can occur. At its most simple analysis, a collection of extracellular fluid tends to force the electrodes further apart and allows for ionic flow which easily bypasses most cell membranes thereby increasing electrical conductance and decreasing impedance [4], The literature on brain impedance has delt largely with acute or in vi tro studies [9,12], Van der Veen et al [11] recorded impedances at var ious depths within the dorsolateral cortex of cat. The anesthetized cats had trephine openings over each hemisphere.…”

Section: Discussionmentioning

confidence: 99%

The Visual Cortex during Chronic Stimulation

Dawson¹

1977

Brain Behav Evol

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The lateral and suprasylvian gyris of cats have been stimulated anodically by surface electrodes for a total of 40 h by biphasic square waves. Peak currents were ±6.0 mA or 1.0 mA,·to peak. Control electrodes were never stimulated. Electrode materials were low-temperature isotropic carbon and metals (Rh, Pt, Au). Reductions in tissue impedance quickly followed the onset of stimulation. The impedance change was related to stimulus current and to the incidence of motor seizures but not clearly to the electrode material. Utilizing concentric electrodes, the impedance change was not localized to the stimulating electrode – tissue interface. No protection from stimulation-associated impedance modifications was provided by the systemic administration of a material of high osmolarity (Mannitol) but the usual impedance decrease was not seen after systemic administration of a glucocorticoid.

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Section: Discussionmentioning

confidence: 99%