Subject
*Theta Rhythm; 2-Amino-5-phosphonovalerate/pharmacology; Animals; Calcium Channel Blockers/pharmacology; Calcium Channels/physiology; Excitatory Amino Acid Agonists/pharmacology; Excitatory Amino Acid Antagonists/pharmacology; Excitatory Postsynaptic Potentials/drug effects/physiology; Long-Evans; Long-Term Potentiation/drug effects/*physiology; Male; N-Methyl-D-Aspartate/physiology; N-Methylaspartate/pharmacology; Neuronal Plasticity/drug effects/*physiology; Nifedipine/pharmacology; Organ Culture Techniques; Rats; Receptors