M Maltchik

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Rats were subjected to three consecutive sessions, one session per day, of either a step-down inhibitory avoidance task using a 60-Hz. 0.3-mA footshock, or a two-way active avoidance task using 20 presentations of a 5-s, 1-kHz tone and a 0.3-mA footshock. After either the first or the second training session animals received an intraperitoneal injection of(More)
Three experiments were conducted to assess the retrieval effects of a single dose of beta-endorphin and of naloxone, and of the novelty-induced antinociception response in the developing rat. Wistar rats 30, 45, 60, and 90 days old from our breeding stock were used. Animals were trained and tested, with a 24-h interval between sessions, in a two-way active(More)
Rats were submitted to three consecutive sessions, one session per day, of step-down inhibitory avoidance task (60-Hz, 0.3-mA footshock) or of two-way active avoidance task (25 trials of a 5-s, 1-kHz tone and a 0.4-mA footshock). Animals received intraperitoneal (ip) injections of saline or beta-endorphin (2.0 micrograms/kg) before or after the second(More)
Rats were submitted to three sessions, with a 24-hr interval between, of step-down inhibitory avoidance task using a 60-Hz, 0.3-mA footshock, or of two-way active avoidance task using 25 presentations of a 5-sec. 1-kHz tone and a 0.4-mA footshock. Animals received intraperitoneal injections of either saline or beta-endorphin (2.0 microgram/kg) after the(More)
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