Dual process theory (moral psychology)

Dual process theory within moral psychology is an influential theory of human moral judgement that posits that human beings possess two distinct cognitive subsystems that compete in moral reasoning processes: one fast, intuitive and emotionally-driven, the other slow, requiring conscious deliberation and a higher cognitive load. Initially proposed by Joshua Greene along with Brian Sommerville, Leigh Nystrom, John Darley, Jonathan David Cohen and others, the theory can be seen as a domain-specific example of more general dual process accounts in psychology, such as Daniel Kahneman's "system1"/"system 2" distinction popularised in his book, Thinking, Fast and Slow. Greene has often emphasized the normative implications of the theory, which has started an extensive debate in ethics.

The dual-process theory has had significant influence on research in moral psychology. The original fMRI investigation proposing the dual process account has been cited in excess of 2000 scholarly articles, generating extensive use of similar methodology as well as criticism.