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. Author manuscript; available in PMC: 2017 Feb 1.
Published in final edited form as: Horm Behav. 2015 Oct 21;78:13–19. doi: 10.1016/j.yhbeh.2015.10.004

Figure 1.

Figure 1

Steroid treatment protocol for the father and paired male conditions. A total of 16 males received estradiol treatment (i.e., vehicle, low dose, high dose) on 3 different months, 2–3 months apart, and an additional 16 males (father and paired males) received the testosterone treatment (vehicle, low, high dose) on 3 different months, 2–3 months apart. Males were tested under each treatment with the vocal control and the infant distress stimulus three days apart.