Western philosophy and science have a strongly dualistic tradition regarding the mental and physical aspects of reality, which makes it difficult to understand their possible causal relations. In recent debates in cognitive neuroscience it has been common to claim on the basis of neural experiments that conscious experiences are causally inefficacious. At the same time there is much evidence that consciousness does play an important role in guiding behavior. This article explores whether a new way of understanding the causal role of mental states and consciousness could be provided by the ontological interpretation of the quantum theory (Bohm and Hiley 1987, 1993). This interpretation radically changes our notion of matter by suggesting tha...