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To ascertain whether very low dosages of pituitary adenylate cyclase-activating polypeptide (PACAP) influence learning in mammals, immediately after the acquisition trial of a passive avoidance response (PAR) paradigm, PACAP-38 was administered intracerebroventricularly at increasing dosages (0, 0.02, 0.2, 2, 20, and 200 ng in 10 μl saline) to different groups of rats. The mnemonic effects were measured...
By means of local administration of tetrodotoxin (TTX) fully reversible functional inactivation of rat's dorsal hippocampus (DH) was obtained in order to define the role of this structure in the memorization of a conditioned passive avoidance response (PAR). In Experiment 1, on permanently cannulated animals, TTX (10 ng in 1.0 μl saline) or saline (1.0 μl) was injected uni- or bilaterally in the...
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