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The kindling paradigm provides a powerful tool for studying the generation, propagation and generalization of seizures. Such reproducible quantitative paradigms are a prerequisite for the experimental study of epilepsy in the developing brain. Kindling has been extensively utilized as a model of limbic seizures in the adult rat; amygdala short-interval kindling has been studied in > or = 15-day-old rats. We applied the short-interval kindling method, i.e., stimulation at every 15 min, to 7-12-day-old rats. Stage-5 behavioral seizures were achieved even in 7-day-old rats; however, the progression of behavioral kindling differed somewhat from that of older rats. Correlation of electrographic discharges and behavioral phenomena was inversely related to age. Reliable progressive amygdala discharges were difficult to assess in most < or = 10-day-old rats. Spontaneous seizures occurred relatively frequently in younger age groups. The amygdala short-interval kindling paradigm is reproducibly and reliably applicable to rats during the 2nd postnatal week. The presence of progressive focal to bilateral-generalized seizures suggests a significant functional maturity of the amygdala-limbic circuitry at this age.
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