Abstract
(1) Both glial and neuronal depolarizations during SD were recorded on the sensorimotor cortex of the rabbit. Glial depolarizations were monophasic and sigmoidal. Neuronal depolarizations could be divided into two stages: an earlier rapid depolarization phase with burst discharges and a later gradual phase with no spike. (2) Average amplitudes of depolarizations with glial cells and neurons were almost the same, 32 and 33 mV, respectively. The average membrane levels observed at maximal depolarizations were relatively constant, −33 mV for glial cells and −16 mV for neurons. (3) Taking into account the extracellular field potentials, it is therefore highly probable that neurons depolarize more than glial cells and can even assume a positive intracellular potential. (4) The correlation of initial membrane potential and amplitude of depolarization in glial cells (correlation coefficient, 0.93) was much closer than in neurons (0.63). (5) Individual intracellular potential changes of neurons and glial cells could be superimposed to form a laminar profile, when adjusted in the horizontal plane at their average maximal levels in membrane depolarization.
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