E. Hermans, et al., “Testosterone Administration Reduces Empathetic Behavior: A Facial Mimicry Study,” PNE 31 (2006): 859; J. Honk et al., “Testosterone Administration Impairs Cognitive Empathy in Women Depending on Second-to-Fourth Digit Ratio,” PNAS 108 (2011): 3448; P. Bos et al., “Testosterone Decreases Trust in Socially Naive Humans,” PNAS 107 (2010): 9991; P. Bos et al., “The Neural Mechanisms by Which Testosterone Acts on Interpersonal Trust,” Neuroimage 2 (2012): 730; P. Mehta and J. Beer, “Neural Mechanisms of the Testosterone-Aggression Relation: The Role of the Orbitofrontal Cortex,” J Cog Nsci 22 (2009): 2357.