Beyond doubt the most significant development in psychology has been the recent tendency to bring together investigations in various fields in order to discover the common principles involved in those investigations. Especially is this true of psychopathology and genetic or child psychology. They have developed independently, and only occasionally heretofore have the results obtained been brought together for comparison.
Meanwhile more and more investigators think that psychologic laws are the same no matter where they are observed. As an example of the growing integration of the various fields of psychologic investigation and the growing feeling of the unity of psychologic laws in spite of the variety of their manifestation, one may refer to the comparative study of the splitting of thought, the phenomena of hypobulia1 in psychopathology, and the phenomenon of syncretic thinking in child psychology. In hypobulia there are phenomena which were formerly considered a result of schizophrenia
VIGOTSKY LS, KASANIN J. THOUGHT IN SCHIZOPHRENIA. Arch NeurPsych. 1934;31(5):1063–1077. doi:10.1001/archneurpsyc.1934.02250050181009
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