By A Kreindler
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Extra resources for Experimental Epilepsy
Example text
8 mm. The effect of strychnine on the mechanism of the cortical specific afferent evoked potential was examined by single unit analysis. Strychnine did not appear to alter the threshold of the specific afferent evoked potential. Repetitive firing of evoked sensory units was observed to depend on the successful evocation of a strychnine spike by the thalamo-cortical volley. The strychnine spike is thus initiated by the discharge of infra-granular pyramids and it is conducted upwards in the cortex by multi-synaptic transmission through a network of cortical neurons with short and ascending axons.
Intrastimulatory motor discharges may last 5-15 sec and the seizure ceases if stimulation is prolonged beyond this interval. (b) Allocortical stimulation. Transition from intrastimulatory discharges to afterdischarges is, we believe, an important aspect in the organization of epileptic activity. Kreindler and Steriade (1963b) followed up this phenomenon with respect to stimulation of the amygdalo-hippocampus complex. , to a suppressor action exerted by the stimulus on the organization of epileptic activity.
Note long ‘tonic’ trains of high-frequency unit discharge with occasional responses and higher frequency bursts. Time mark, 50 msec. ) 42 THE EXP E RIM ENTAL E P I L E P T O G E N I C FOC U S Sawa et al. (1963) studied the intracellular potentials during the whole process of epileptic seizures induced electrically in the cerebral cortex and the hippocampus by single shock and repetitive electrical stimulation. Most cortical and hippocampal neurons showed a depolarizing wave followed by a hyperpolarizing wave in response to a single pulse at the surface.