Miten Renvallin historianfilosofiaa voidaan selittää? Perimmäinen selitys Renvallin historianfilosofiassa // [How can Renvall's philosophy of history be explained? Fundamental explanations in Renvall's philosophy of history]

Abstract
According to Renvall, historical change derives from developmental changes in human psychology toward more rational and differentiated levels of mental activity, possibly reflecting underlying physiological changes. This theory is not satisfactory.