Tomasello argues in the target article that a sense of moral obligation emerges from the creation of a collaborative “we” motivating us to fulfill our cooperative duties. We suggest that “we” takes many forms, entailing different obligations, depending on the type of the relationship in question. We sketch a framework of such types, functions, and obligations to guide future research in our commentary.

ABSTRACTClose relationship partners often respond to happiness expressed through smiles with capitalization, i.e. they join in attempting to up-regulate and prolong the individual’s positive emotion, and they often respond to crying with interpersonal down-regulation of negative emotions, attempting to dampen the negative emotions. We investigated how people responded when happiness was expressed through tears, an expression termed dimorphous. We hypothesised that the physical expression of crying would prompt interpersonal down-regulation of emotion when the onlooker perceived that the expresser was experiencing (...) negative or positive emotions. When participants were asked how they would behave when faced with smiles of joy, we expected capitalization responses, and when faced with tears of joy, we expected down-regulation responses. In six experimental studies using video and photographic stimuli, we found support for our hypotheses. Throughout our investigations we test and discuss boundaries of and poss... (shrink)

New technologies are changing our lives radically and quickly. New biotechnologies are moving to commercial uses faster than government regulators or private citizens can monitor. This tension manifests itself in the current debates over xenotransplantation technologies in medicine. The possibility of removing cells, tissues, and organs from animals and transplanting them into human beings is startling and unnerving. Natural immunesystem barriers between species, and even between individuals within a species, are formidable. Typically, transplantation results in violent rejection and death of (...) the grafted organ. But despite the natural barriers to transplantation, xenotransplantation aims specifically to overcome them.In this paper, I will discuss applications of xenograft technology, which raises clinical risks, ethical concerns, and policy issues. I conclude with a set of specific recommendations. As a recent letter to the journal Nature puts it, there is a “split between those who want to get it right, and those who want to get it right now.” No one knows what all the risks, benefits, and unintended consequences of xenotransplantation will be. (shrink)

New technologies are changing our lives radically and quickly. New biotechnologies are moving to commercial uses faster than government regulators or private citizens can monitor. This tension manifests itself in the current debates over xenotransplantation technologies in medicine. The possibility of removing cells, tissues, and organs from animals and transplanting them into human beings is startling and unnerving. Natural immunesystem barriers between species, and even between individuals within a species, are formidable. Typically, transplantation results in violent rejection and death of (...) the grafted organ. But despite the natural barriers to transplantation, xenotransplantation aims specifically to overcome them.In this paper, I will discuss applications of xenograft technology, which raises clinical risks, ethical concerns, and policy issues. I conclude with a set of specific recommendations. As a recent letter to the journal Nature puts it, there is a “split between those who want to get it right, and those who want to get it right now.” No one knows what all the risks, benefits, and unintended consequences of xenotransplantation will be. (shrink)

Two studies document that people are more willing to express emotions that reveal vulnerabilities to partners when they perceive those partners to be more communally responsive to them. In Study 1, participants rated the communal strength they thought various partners felt toward them and their own willingness to express happiness, sadness and anxiety to each partner. Individuals who generally perceive high communal strength from their partners were also generally most willing to express emotion to partners. Independently, participants were more willing (...) to express emotion to particular partners whom they perceived felt more communal strength toward them. In Study 2, members of romantic couples independently reported their own felt communal strength toward one another, perceptions of their partners’ felt communal strength toward them, and willingness to express emotions to each other. The communal strength partners reported feeling toward the participants predicted the participants’ willingness to express emotion to those partners. This link was mediated by participants’ perceptions of the partner’s communal strength toward them which, itself, was a joint function of accurate perceptions of the communal strength partners had reported feeling toward them and projections of their own felt communal strength for their partners onto those partners. (shrink)

We agree with Grossmann that fear often builds cooperative relationships. Yet he neglects much extant literature. Prior researchers have discussed how fear (and other emotions) build cooperative relationships, have questioned whether fear per se evolved to serve this purpose, and have emphasized that human cooperation takes many forms. Grossmann's theory would benefit from a wider consideration of this work.

Baumard et al.'s definition of morality is narrow and their review of empirical work on human cooperation is limited, focusing only on economic games, almost always involving strangers. We suggest that theorizing about mutualisms will benefit from considering extant empirical behavioral research far more broadly and especially from taking relational context into account.