Statistical analysis revealed a significant negative correlation between slow SP(pure) density in the MD and the years since epilepsy onset (Figure 7; r = -0.653, N = 10, p = 0.040), whereas the fast SP(pure) density in the same nucleus correlated positively with the seizure prevalence (r = 0.633, N = 10,p = 0.050). No significant correlation occurred between the ANT spindle density (SP(pure) and SP(ripple)) and years since epilepsy onset (p > 0.061), and with seizure prevalence (p > 0.384).