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Food-deprivation level alters the effects of morphine on pigeons' key pecking.
Four pigeons pecked response keys under a multiple fixed-ratio 30 fixed-interval 5-min schedule of food presentation. Components alternated separated by 15-s timeouts; each was presented six times. Pigeons were maintained at 70%, 85%, and greater than 90% of their free-feeding weights across experim...
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| Auteurs principaux: | , , |
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| Format: | Artigo |
| Langue: | Inglês |
| Publié: |
1998
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| Sujets: | |
| Accès en ligne: | https://ncbi.nlm.nih.gov/pmc/articles/PMC1284659/ https://ncbi.nlm.nih.gov/pubmed/9599451 https://ncbi.nlm.nih.govhttp://dx.doi.org/10.1901/jeab.1998.69-295 |
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