Despite of the changes in the kantian project is possible to identify the problem of the madness as being boarded in two perspectives: 1. physiologic, 2. semantic. The physiologic approach corresponds to the model of the sciences about objects of the external senses. The semantic approach of the madness develops inside of the critical task of the philosophy, that is, as part of an investigation concerning the reach and the limits of the human reason. In this sense, the madness is in two different series. In the first case it appears entailed to the cerebral lesions, problems of perception or with the consumption of substances that change the physical operation. In the second case it relates with enthusiasm prophetic, the religious fanaticism, mysticism and even with the metaphysic. To develop our work here will present elements of the physiologic approach and of the semantic approach found in some of the different texts and, finally, will accomplish some considerations on the development possibility of one know about the madness in Kant.
madness; language; physiology; psychology; Kant