“…Subsequent studies confirmed a hippocampal role in pain processing (Lathe, 2001) using extracellular recordings (Zheng and Khanna, 1999), intracellular recordings (Wei et al, 2000), hippocampal EEG (Archer and Roth, 1997), in vivo microdialysis (Ceccarelli et al, 1999), immediateearly gene expression (Pearse et al, 2001), long-term potentiation (Wei et al, 2000), and functional neuroimaging (Hsieh et al, 1995;Derbyshire et al, 1997;Becerra et al, 1999;Casey, 1999;Peyron et al, 1999;Schneider et al, 2001). Wei et al (2000) demonstrated that the amplitude of EPSPs in hippocampal CA1 pyramidal cells is positively related to the intensity of nociceptive stimulation.…”