The article presents the most important and almost forgotten theses of Franz Brentano's empirical psychology, which have significance for conceptualization and the method of psychological research. The psychology programme, introduced as early as 1874, remains on the fringes of mainstream empirical psychology, but it was the starting point for Kazimierz Twardowski and his students. The continuation and development of Brentano's thought in the twentieth century can significantly enrich and broaden psychology's theoretical and empirical perspective. This applies primarily to reductionism and the social dimension of mental phenomena.
Keywords: Early European psychology; Intentionality; Psychology of acts; Reductionism; Replication crisis; The social dimension of mental phenomena.
© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.