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. Author manuscript; available in PMC: 2009 Jun 22.
Published in final edited form as: Psychopharmacology (Berl). 2007 Oct 24;196(3):441–450. doi: 10.1007/s00213-007-0978-6

Fig. 3.

Fig. 3

Virtual drug levels during whole sessions of (A) actual cocaine, (B) virtual cocaine, (C) actual remifentanil, and (D) virtual remifentanil self-administration. Data in B and D are from the same sessions shown in Fig. 1. Horizontal lines in B and D represent value of threshold. Sessions for actual remifentanil were limited to 3600 s. At the lowest virtual dose of cocaine and remifentanil, the session was ended when 100 pellets had been delivered.