While it was a minority view in the 1960s, eliminative materialism gained prominence and acceptance during the 1980s. Proponents of this view, such as B.F. Skinner, often made parallels to previous superseded scientific theories (such as that of the four humours, the phlogiston theory of combustion, and the vital force theory of life) that have all been successfully eliminated in attempting to establish their thesis about the nature of the mental. In these cases, science has not produced more detailed versions or reductions of these theories, but rejected them altogether as obsolete. Radical behaviorists, such as Skinner, argued that folk psychology is already obsolete and should be replaced by descriptions of histories of reinforcement and punishment. Such views were eventually abandoned. Patricia and Paul Churchland argued that folk psychology will be gradually replaced as neuroscience matures.