«This suggests that certain neurons in the brain may be specialized to
prefer social rewards over nonsocial rewards, and that the processing of social cues is sensitive to circulating hormones,» McHenry said.
Since both solutions were (i) equally difficult, (ii) demonstrated an equal number of times, (iii) resulted in an equal food
reward, and (iv) counterbalanced between groups, any preference by observers to later
prefer one receptacle over the other was likely influenced by the
social characteristics of the model.