ABSTRACT
This chapter explains internalism and externalism about motivation. It also explains the Humean account of motivation. The chapter explains the implications from issues in moral psychology. It also outlines some potential worries for discussions about moral psychology. The centrality of moral psychology is partly due to how it influences other areas of metaethics. Adopting non-cognitivism has the immediate benefit of allowing someone to hold onto the Humean account and internalism. The debate between internalism and externalism is about the link between moral judgement and motivation and not about whether true judgements motivate. The key question is whether people can fail to be motivated to do what they judge to be right, not whether they fail to do what is right, for motivation and action are distinct. There is a debate in metaethics that concerns reasons and centres on what is the best explanation of the link between moral judgements and reasons for action.
