Abstract
Morphine administration to neonatal rats on days 1–7 after birth produced long-term changes in behavior and brain function. The pups were smaller than saline-treated littermates and showed retarded motor development. As adults, the morphine-treated rats had impaired motor coordination, altered gait, and altered patterns of activity in an open field. Several brain regions of the adult rats, including motor areas, had decreased metabolic activity as measured by the 2-deoxy-glucose technique, suggesting decreased functional activity in these areas. These results may be relevant to findings that children exposed in utero to narcotics tend to have impaired motor development.
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