Excerpt from Psychological Monographs, Vol. 28

The work began in 1912 with a year of preliminary experi mentation in the Psychological Laboratory of the University of Michigan. This was continued the following year at the Eastern Kentucky State Normal School. In 1914 the work was trans ferred to the Psychological Laboratory of the University of Wis consin, where the problem and technique soon took on their final form and where the work was continued until the spring of 1918. A preliminary report containing a description of the gen eral technique and the results from a few subjects was submit ted to the University of Wisconsin as a Master's thesis in 1915. An abstract of this work was also presented in a paper before the Chicago meeting of the Psychological Association of that year, together with a demonstration of an imperfect model of the apparatus used.

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