References and Notes

adding a humanistic touch to the mind-brain sciences. Feelings of love and loneli-ness, and the thoughts they provoke, are constructed in part from neural pathways in the brain that regulate core emotional re-sponses, such as playfulness, sexuality, and friendship, as well as separation distress in our fellow creatures (6). Of course, scientists should continue to be skeptical about such hypotheses until they are supported by solid research such as that carried out by Eisenberger and co-workers. Although there are many species differences in the emotional systems that we share as ancestral gifts with other ani-mals (6, 22, 23), the field of neuroscience will be more productive if it remains open to the similar nature of human and animal affective experiences