A scathing review of B.F. Skinner's book Verbal Behavior by Noam Chomsky in 1959 heralded a shift back to a focus on the mental in psychology with the beginning of the cognitive revolution.[5] Critical to the successful revival of the mind or consciousness as a primary focus of study in psychology (and in related fields such as cognitive neuroscience) were technological and methodological advances, which eventually allowed for brain mapping, among other new techniques.[6] These advances provided an objectively experimental way to begin to study perception and consciousness, effectively nullifying the main criticism of mentalism half a century earlier.