Continuity and Discontinuity between the Psychological World and the Biological World

In this commentary paper I try to make complementarily more discussion on two question. First, the target paper (Zagaria, Andò, & Zennaro, 2020) points out the lack of continuity in the concepts used in psychology. The authors aim for a rigorous definition which is necessary to rebuild mud figures of psychology, but is that the only direction? Second, the evolutionary psychology seems to allow for a diversity of methodologies, but is there any limitations and possibilities of approaching the origin of the mind from biologically based methods? To answer this question, I went back and examined Freud's earlier studies and Vygotsky's theoretical considerations from the history of psychology. As a result, it was pointed out that the shift from the biological world to the psychological world had a fundamental problem of conversion from quantity to quality. As a clue to its elucidation, I considered on the semiotic mediation, the psychological causality, and the work of apperception.