Some psychologists and philosophers have argued that neuroscience is importantly relevant to our moral responsibility practices, especially to our practices of praise and blame. For consider: on an unprecedented scale, contemporary neuroscience presents us with a mechanistic account of human action. Furthermore, in uential studies – most notoriously, Libet et al. (1983) – seem to show that the brain decides to do things (so to speak) before we consciously make a decision. In light of these ndings, then – or so (...) some have argued – we ought to revise our practices of praise and blame. In the current paper, I argue that this conclusion is unwarranted. The reason is that the argument for it depends on controversial non-empirical premises, premises we need not accept. I suggest, however, that neuroscience does bear on our moral responsibility practices in one important, if less revisionary, way. In particular, neuroscience o ers a new kind of evidence for determining when agents should be held exempt from our normal moral responsibility practices. (shrink)