Negation is a constancy in psychology, and in particular, important objects of psycholin—guisitics. In the first generation of cognitive science, theories are used of transfer—generative grammer,pragmatic presupposition, thematic feature and contextual modes to account for negation. In the secondgeneration of cognitive science, negation is thought of as a dynamic process of simulation, so the featuresare implicit . This provides with explanation for other aspects of meaning in reality .