Excerpt from Harvard Psychological Studies, Vol. 4<br><br>In two previous articlesl upon the negative instruction the main interest was directed toward the effect of such instruction upon the suppression of imagery and the muscles of the vocal organs. The work described in the present article was undertaken in order to obtain an analysis of the process of executing a skillful movement, that is, a movement requiring perfect motor control, under the conditions of positive and negative instruction.<br><br>The experiments were conducted in the Harvard labors: tory in the spring of 1912 upon five subjects referred to as A, B, C, D, and E. They were all graduate students, with a training in experimental methods.<br><br>The instrument used was a tracing board similar to the one recommended by Whipple.2 The subject passed the wire attached to the stylus through his coat sleeve, so that it would move freely with his arm and not interfere with its movements. He sat before a table of convenient height with the board directly in front of him.<br><br>About the Publisher<br><br>Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com<br><br>This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.