P3 ERP component (Basar et al., 1999; Basar-Eroglu et al., 1992; Demiralp et al., 2001; Karakas et al., 2000; Schurmann et al., 2001; Stampfer and Basar, 1985; Yordanova and Kolev, 1996). However, the primary contributors to the P3 ERP component in P and NP rats have not been determined. Further research needs to be done to understand the relationship between PLI, ERO energy and ERP amplitude.