Abstract
By the end of World War II, five Japanese researchers had published their psychological researches with animals in English journals. In the present paper, I highlight two of these researchers, Ryo Kuroda and Gennosuke Yoshioka (alias Joseph G. Yoshioka), in terms of their international contributions. In contrast to Kuroda, who did not study abroad, Yoshioka conducted research in the U. S. under prominent animal psychologists such as Edward C. Tolman, Karl S. Lashley, and Robert M. Yerkes. Kuroda experimented with various species ranging from lower vertebrates to monkeys, while Yoshioka mainly used rats in his work. Although their careers took different paths, they shared a similarity in that both remained outside Japan’s mainstream psychology.
