Abstract
1. Four normal girl students of a provincial Girl's Junior College volunteered and was subjected to repeated tests for the ability of mental work, carried out after the procedure developed by Mr: Yusaburo Uchida.
Of four test-sessions, covering 2 weeks, the first and the third tests were performed with oral signaling, while the second and the fourth tests were done with a signal clock.
2. With oral signaling, initial effort effect was sometimes absent or less marked, which was not the case with clock signaling procedure. No other significant, differences were noticed between the two procedures.
3. A “hump” formation was often observed somewhere about the tenth minute from the beginning of the test, in individual curves as well as collective composite curves.
