| 
                    
                    Hagen,E.H. & Barrett,H.C. (2007)
                 | 
                
                    Perinatal sadness among Shuar women: Support for an evolutionary theory of psychic pain
                 | 
                
                 | 
                
                 | 
            
            
                | 
                    
                    Hagen,E.H., Barrett,H.C., & Price,M.E. (2006)
                 | 
                
                    Do human parents face a quantity-quality tradeoff? Evidence from a Shuar community
                 | 
                
                        View...
                 | 
                
                 | 
            
            
                | 
                    
                    Hess,N.H. & Hagen,E.H. (2006)
                 | 
                
                    Psychological adaptations for assessing gossip veracity
                 | 
                
                 | 
                
                 | 
            
            
                | 
                    
                    McElreath,R., Clutton-Brock,T.H., Fehr,E., Ressler,D.M., Hagen,E.H., Hammerstein,P., & [et-al]. (2003)
                 | 
                
                    Group report: The role of cognition and emotion in cooperation
                 | 
                
                 | 
                
                 |