 This core idea gives rise to many questions. One is explanatory: Why do we think that the neighbour did something wrong? Explanatory sentimentalists believe that moral thoughts are fundamentally explained by sentiments or emotions. The second kind of question is constitutive: What does our thought that the neighbour did something wrong consist in? That is, what kind of thought is it? Is it more like believing that Pluto is a planet or like wanting to hit an uncooperative computer? Judgment sentimentalists believe that moral judgments are constituted by emotional or non-cognitive responses, at least in part, or alternatively are judgments about emotional responses or the tendency of something to give rise to them. Some judgment sentimentalists are also expressivists, who believe that the meanings of moral terms must be accounted for in terms of associated non-cognitive states.