1
Ecause they are also induced by epileptiform population bursts in theEcause they are also induced by epileptiform population bursts in the CA3 region (Buzski a et al., 1989b, 1991a). In contrast, type 2 IEDs have positive polarity in the CA1 stratum radiatum and they are typically initiated by the population discharge of CA2/CA3a neurons whose axon collaterals target mainly the basal dendrit