In reviewing the similarities and differences that exist between the introspectionists and the behaviorists, Professor H. C. Warren 1 concludes that " If we lay aside our traditional prejudices and the bias attaching to the terms 'psychology' and 'behavior,' we cannot but admit the close relation between the events studied by the two groups. Both 'conscious experiences' and manifestations of 'behavior' are phenomena of organic creatures. And further, except in the lowest creatures, they are

more »

... mately associated with the operations of the nervous system. ... A balanced view of the field of psychology, then, would seem to make its central feature the specific activity of the nervous system" (p. 249). As a behaviorist, the writer 2 doubts whether a series of fundamental conceptions acceptable to both introspectionist and behaviorist can be developed. However the challenge which Warren implies is so obviously appropriate under the controversial conditions that exist, that the compromise on fundamental principles which he has formulated should •Warren, H. C, 'Psychology and the Central Nervous System,' PSYCBOL. REV., 28, 1921, 249-269. J In this article the writer speaks only for himself. Behaviorism does not mean the same thing for all who use the term. In the historical development of behaviorism the first attempts were directed against the typical introspectionist experiment. For this reason behavioristic literature is still largely concerned with defending itself against the traditional method of formulating a psychological problem, instead of setting its own problems in its own way.