Abstract

In relation to moral judgment, it is the 'reasoning' and 'intuition' of human representative decision mechanism in cognitive science. The first type is intuitive and automatical way of thinking, and second is ratiocinative and reflecting one. Kohlberg asserted that the most powerful impetus comes from moral reasoning to lead moral judgment and behavior. Haidt explained that intuition plays an leading role and reasoning charges only role of post-justification, in the almost majority of moral situation, via social intuitionism model. Greene elucidates that deontological judgement is deduced intuitively by emotional response automatic and immediately, and judgment due to result does so by reasoning, conscious and reflecting cognitive reaction, through dual process theory. Kahneman maintains that humans make incomplete and irrational judgment, because they have incomplete ability of information processing inherently. To make good judgment, there are so many data to be processed, and we need to make decisions rapidly. Therefore, we use, so-called 'shortcut of judgment' of heuristic, that is, intuition. They acknowledges biased intuition as subject to overcome and upholds the effect of intuition used widely in decision-making at the same time. On the other hand, Gigerenzer claims that it does not necessarily define intuition as source of irrational bias and needs to think it as useful environmental adaptation tool box. In current moral education, the reasoning education is being utilized as core factor to enhance the ability of moral judgment. However, according to the opinions of intuitionist along with Haidt, it suggests strongly that it is not so useful the method of moral education based on reasoning in making moral judgment. This might be clearly significant challenge to moral education. It is because that it supports Haidt's argument that plays an important role for intuition resulting from emotion in moral decision making by many empirical studies recently. In this study, it argues that it guards against the view of underestimating role of moral reasoning, and reasoning could be utilized significantly in decision-making. Reasoning used in situation requiring more complex deliberation differs from intuition system used in context to make rapid decision more effectively, in its roles.