Apesar de pouco enfatizado na historiografia da psicologia, o século XVIII apresenta uma imensa riqueza de discussões fundamentais para a psicologia. Esse é o caso da obra principal de Tetens, Philosophische Versuche über die menschliche Natur und ihre Entwickelung (1777). O objetivo do presente artigo é descrever as principais características do objeto e do método de investigação psicológica nessa obra. Em nossa análise, verificamos que, embora seja uma disciplina filosófica, a psicologia é um campo específico de conhecimento que se baseia no autosentimento. Além disso, apontamos algumas evidências textuais para sustentar a tese de que a psicologia empírica é, segundo Tetens, propedêutica à metafísica. Palavras-chave: Johann Nicolaus Tetens, psicologia, introspecção, história da psicologia, filosofia da psicologia. Although little emphasized in the historiography of psychology, the eighteenth century portrays very rich discussions on fundamental issues in psychology. This is the case of Johann Nicolaus Tetens's magnum opus, Philosophische versuche über die menschliche natur und ihre entwickelung (1777). The goal of this paper is to present the main aspects of the subject matter and method of psychological investigation in that work. Our analysis suggests that, despite being a philosophical discipline, psychology constitutes a specific field of knowledge, a science based on selffeeling. Besides, we present textual evidence to support the thesis that empirical psychology is, according to Tetens, propaedeutic to metaphysics.
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