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Explanation of cognition in Cognitive Science A review of Vacariu et al's explanation of cognition involved in "Toward a very idea of representation" ABSTRACT. In this article I reproduce and examine some aspects of Vacariu et al explanation of cognition. I conclude that their explanation of cognition is not a complete one. I try to propose some alternative explanations toward a complete explanation of every posible cognition and to emphasize that the task of philosophy, as discipline included in Cognitive Science, is to find the necessary and sufficient conditions of every posible cognition. In final, I try to criticize the idea that cognition can be only representational. There is a cognitive arhitecture with a hierarchy of levels of existence. Vacariu et al has considered that cognition cannot be explanated by a single level. Arguments: -the emergency of the primitives of one level from the primitives of previous level. - bidirectionality of cognitive processes; bidirectionality, wich is for Vacariu et al one of the most important ideas, is the continuous circular causation wich exist between conceptual and neural levels: the changes wich appear at the conceptual level involve changes at neural level and vice-versa. Because of bidirectionality it is imposible to be explanated cognition using a single level, either by conceptual level like Fodor or by neural level as Churchlands.