The English term “empathy” is of recent origin; according to the Oxford English Dictionary, it was introduced only in 1909. But the idea is clearly present from ancient times, e.g., in Aristotle’s idea that a friend is for us like “another self”. At the end of the Spirit chapter of the Phenomenology, Hegel speaks of the softening of the hard heart of someone in the position of judging someone else, and more generally he proposes a sort of Kantian universalization of the Aristotelian ethical stance of friend toward friend, in his notion of mutual recognition.
Reflecting contemporary attitudes, the Wikipedia article on empathy is dominated by mentions of various psychological research. In general, I feel deep ambivalence about psychology as a discipline. It deals with matter of vital importance and sometimes affords valuable practical insights, but psychological theories often seem to me to afford narrow or partial insights into the complexity of human being that their proponents don’t recognize as narrow or partial. Psychology and psychiatry are dominated by an uneven mixture of empiricism and “common-sense” views of human subjectivity, only rarely leavened by engagement with philosophical approaches to the subject matter. What philosophy does get a hearing is most often a sort of popularized existential phenomenology, not the sort advocated here.
(Insofar as so-called anti-psychiatry advocates a more deeply philosophical approach to subjectivity, I am sympathetic, but here too the proponents often engage in unsound over-generalization. As many issues as there are with the medicalization of “mind”, therapy can still have real value for helping people, and research continues to uncover new and interesting results. We just have to be wary of overstated theoretical claims.)
I think about empathy mainly in an ethical rather than psychological way. Interactions between ethics and psychology (indeed, between ethics and empirical disciplines in general) are tricky. From an ethical standpoint, we need to take relevant empirical information into account, but in a thoughtful and practical way, without putting the results on a pedestal, and especially without over-generalizing.
Empathy is a very important value to me. In personal life, I tend to err in the direction of trusting too much and sharing too much. It is an important principle to me to give people the benefit of the doubt until they prove they don’t deserve it. I sometimes give too many chances, because I’d rather err in a kind-hearted way than in a hard-hearted way.
Much of the psychological literature on empathy treats it as a faculty or skill, and as part of a kind of social normalization. Unlike the standard caveat that normativity in ethics has nothing to do with mere social conformity, in the institutional context of psychology and psychiatry, “normality” is typically judged by empirical statistical criteria. What is “normal” in this sense is purely a matter of fact, which nothing to do with what is really good or best. But many people assume that what is empirically “normal” somehow has a normative status anyway.
It is likely that there are low-level neurological functions that may facilitate things like empathy, but that does not mean that empathy is reducible to these functions. So-called mirror neurons, initially discovered in monkeys, are specialized neurons that fire both when we do something and when we observe someone else doing the same thing. This could be seen as contributing to our partial tendency to spontaneously identify with others, but the initial finding only concerned externally observable motor functions, not deep feeling.
Again, from an ethical point of view, what is most important is not what the psychologists call “empathic accuracy”, but rather how much weight we give to empathy as a value in our lives. And from my more specific Aristotelian-Hegelian point of view, how much weight we give to empathy as a value is to be discerned primarily from our doings rather than from our self-reports. The “common sense” bias of empirical psychology shows up in the assumption that we can get accurate views of people’s character by simply scoring their responses to survey questions. People’s self-reporting does tell us something, but not the whole story.
How much weight people really give to empathy as a value also should not be judged by the incidental features of immediate social interaction. Someone may be a poor “mind reader” and socially somewhat clueless, yet care about others more deeply than those who are better mind readers, and manifest that in deeds when it really matters. But many people quickly judge others based on superficial aspects of immediate interaction. (See also “Mentalizing” vs Emotional Empathy.)