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. Author manuscript; available in PMC: 2019 May 29.
Published in final edited form as: Psychopharmacology (Berl). 2017 Sep 15;234(23-24):3499–3506. doi: 10.1007/s00213-017-4734-2

Figure 4: Effect of Environmental Enrichment on Demand Curves for Remifentanil.

Figure 4:

Remifentanil demand curves for Enr (gray triangles; n = 7 for 1 μg/kg; n = 5 for 3 μg/kg), Std (black squares; n = 7 for 1 μg/kg; n = 5 for 3 μg/kg), and Iso (white circles; n = 7 for 1 μg/kg; n = 5 for 3 μg/kg) rats that were trained with 1 μg/kg remifentanil (A) or 3 μg/kg remifentanil (B).