Cross-correlation analysis reveals a close correlation between the waves in an electroencephalogram and slow membrane transients of single neurons of the sensorimotor cortex of cats during spontaneous activity, augmenting and recruiting responses, and after local application of strychnine. Time-series correlation coefficients up to 0.7 have been computed. It is suggested that the waves of the electroencephalogram reflect an integration of the changes of membrane potentials in both the cell bodies and dendrites of cortical neurons.
Intracellular recordings and electroencephalograms were obtained from neurons of the motor cortex during augmnenting responses elicited by repetitive stimulation of its specific thalamic nucleus. The postsynaptic potentials during fully developed augmenting responses consistedf two depolarizing waves with two separate groups of spike dicharges of different latencies, the bases of the spikes, the so-called "firing-levels," sometimes shifting. This supports the concept that the postsynaptic potentials accompanying the augmentintg response consist of a primary response and a response of recruiting character.
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