What makes cerebral activity conscious? What differentiates conscious from non-conscious cerebral activity? This problem is known as the search for neuronal correlates of consciousness. The article reviews critically current topics concerning the more restricted issue, namely, the neural correlates of visual awareness. Two main views are described. Advocates of one view claim that a specific brain region or set of regions must be active. The others tend to assume that the crucial is the type of activity taking place. In spite of a remarkable progress of neuroscientific research of visual awareness the problem remains still unsolved.