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Paired pulse ratio (PPR) and coefficient of variation. (A) PPRs of neurons showing significant potentiation did not differ significantly from PPRs of neurons that did not potentiate 30 min after the conditioning stimulation (P = 0.992 by Student’s unpaired t test). (B) Normalized and squared coefficient of variation (CV−2) was not significantly changed in all time points recorded (P = 0.157 by RM ANOVA on ranks).
