Taking an opposite standing point of dualism, we take an enactive approach to understanding human cognition. We focus on the interaction between perception and action. On the one hand, we are interested in how humans build up knowledge about the world through explorative action, ranging from basic perception to high-level cognition such as belief. On the other hand, we are interested in how humans make action choices under the guidance of knowledge. We use a combination of techniques such as eye-tracking, EEG, fMRI, and MEG to understand the neural mechanism.