In my paper I claim that “Kantian legacy” still influences the topic of the categories even in the field of cognitive sciences, where often the terms ‘concept’ and ‘category’ are used indifferently. In the light of the notion of mental representation, I consider empirical concepts as empirical generalizations carried out on information contained in mental representations corresponding to specific phenomenic objects. Such generalizations allow humans to define the core of the attributes referring to all objects that form a class. I finally describe an empirical concept as a framework not only constituted by the attributes of a class of phenomenic objects but also by other attributes assigned to the same objects by the individuals who experience them.