Different Responses to Reward Comparisons by Three Primate Species Freeman, Hani D. ; Sullivan, Jennifer ; Hopper, Lydia M. ; Talbot, Catherine F. ; Holmes, Andrea N. ; Schultz-Darken, Nancy ; Williams, Lawrence E. ; Brosnan, Sarah F. Abstract Publication: PLoS ONE Pub Date: October 2013 DOI: 10.1371/journal.pone.0076297 Bibcode: 2013PLoSO...876297F