Effects of beta-chlornaltrexamine on separation distress in chicks.

@article{Panksepp1982EffectsOB,
  title={Effects of beta-chlornaltrexamine on separation distress in chicks.},
  author={Jaak Panksepp and Stephen M Siviy and L Normansell and Kerrin White and Phillip M. Bishop},
  journal={Life sciences},
  year={1982},
  volume={31 20-21},
  pages={
          2387-90
        }
}
Intraventricular B-chlornaltrexamine (2 micrograms) increased distress vocalizations (DVs) in chicks, and reduced the ability of intraventricular morphine (.1-.5 micrograms), to inhibit DVs. Object imprinting was not blocked by central CNA, but systemic naloxone (10 mg/kg) did attenuate imprinting to a green but not a red object.