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. Author manuscript; available in PMC: 2014 Oct 6.
Published in final edited form as: Eur J Neurosci. 2013 Nov 28;39(4):650–662. doi: 10.1111/ejn.12429

Figure 2.

Figure 2

Inverted-U shaped dose-dependent effects of D1 receptor agonist treatment on singing behavior. A and B) Locations of the cannula tip for each bird in coronal sections of one hemisphere of the starling brain. Circles represent experimental animals for which the site of injection was centered in mPOA. Triangles represent control animals for which the site of injection was centered outside of mPOA. The site of injection for the gray circle and the triangles with gray outlines was located approximately 50 microns rostral to the dark circles at the level of the tractus septomesencephalicus. See Figure 1 for abbreviations. C - D) Bar graphs illustrating effects of saline (SAL) and 3 doses (0.2 μg; 0.20 μg; 2.0 μg) of the D1 receptor agonist SKF 38393 on measures of sexually-motivated male song. Sample size is indicated at the bottom of the figure. Different letters above bars indicate significant differences resulting from post hoc comparisons (p < 0.05).