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. Author manuscript; available in PMC: 2011 Mar 1.
Published in final edited form as: J Chem Neuroanat. 2009 Apr 5;39(2):141. doi: 10.1016/j.jchemneu.2009.03.008

Figure 1.

Figure 1

A) Mean number of complete song bouts produced by male starlings during 2 test days after vehicle treatment and two test days after treatment with the opioid receptor antagonist naloxone; n = 14 in each condition, B) Mean bouts of feeding and drinking over the 2 test days for vehicle and naloxone treated males; C) Mean total times a male starling initiated song during 2 test days after treatment with vehicle and 2 test days after treatment with the opioid receptor agonist fentanyl; n = 14 in each condition, D) Mean bouts of feeding and drinking over the 2 test days for vehicle and fentanyl treated males. * indicates p< 0.05. Figures A and B redrawn from data reported in (Riters et al., 2005). Figures C and D redrawn from data reported in (Schroeder and Riters, 2006).