Lampl-de Groot believes that the science of psychoanalysis must develop in coöperation with other natural sciences. Recent research in neurophysiology and anatomy, cybernetics, and ethology throw light on the physical basis of the

mind and its earliest developments. Some of the findings of scientists in these fields, including Adrian, Wiener, Lorenz, and Walter, are briefly reviewed and the author discusses what meaning these findings may have for psychoanalysis.