Naloxone, morphine, and morphine plus naloxone were injected IP into rats immediately
after training in several different behavioral tasks, and their effect on retention was evaluated …

Naloxone enhanced retention when systemically administered to male F344 rats after
training in a one-trial inhibitory avoidance task. Further, the memory-enhancing ability of …

The present studies characterized the receptor mechanisms of morphine-induced states of
memory. Morphine (5 mg/kg) produced a state in which rats could learn and retrieve an …

The post-training IP administration of naloxone (0.8 mg/kg) facilitates memory consolidation
of the habituation of a rearing response to a tone in rats. Amphetamine (1.0–2.5 mg/kg or …

The studies reported here demonstrate that opioid antagonism enhances memory in two
classes of animals viz. Aves and Mammalia. In mice, immediate posttraining administration …

Naloxone impairs acquisition of shuttle avoidance behavior (0.8 mg/kg IP) and habituation to
a rearing response to a tone (1.6 mg/kg IP) in rats. β-Endorphin (2 μg/kg IP) has no effect on …

Previous research has demonstrated that naloxone, an opiate antagonist, facilitates time-
dependent memory processes. The present study was undertaken to determine whether the …

Mice were trained in step-down and step-through type passive avoidance learning tasks and
given retention tests. Pre-training administration of morphine impaired retention, the effect …

Naloxone (0.01–1.00 mg/kg, ip) facilitated retention of a one-trial inhibitory avoidance task,
when administered to male Rockland mice immediately after training, as indicated by …

In the present study, the effects of systemic administration of morphine on spatial memory
acquisition of a Morris water maze (MWM) task have been investigated in morphine …