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“In contrast to cocaine effects, morphine decreased rearing activity in both, prenatally MA-exposed and saline-exposed rats, and locomotion only in prenatally MA-exposed rats in the Laboras.”
“Rats prenatally exposed to morphine exhibited a significantly higher preference for the morphine-paired compartment, suggesting that prenatal morphine induces a long-lasting enhancement of its reinforcing effect.”
Pharmacology Biochemistry and Behavior • 1997 | View Paper
“Rats prenatally exposed to morphine exhibited higher analgesia in response to a morphine challenge, and a greater preference for saccharin solution as compared with both control groups.”