Learning and integration of component movements in a pattern of motion.

Dimensional analysis of motion: VI. The component movements of assembly motions.

“…The results on the effects of practice, as just described, are equivalent to experimental findings obtained in previous studies of learning and component movements in tracking behavior (2, 3) and panel control motions (1,4,5,6). In all of these tasks, the human body seems to act like a many-channeled system in the production of discrete unrelated movements for a given task, the integration of which is not altered materially by continued practice.…”

“…The application of electronic methods to investigation of human motions (1,4,5) provides the means of systematic experimental study of long-standing problems of motor coordination. Such electronic techniques, which have been used previously in studying panelcontrol operations and closely related performances, are used in this study to analyze the component movements in assembly motions.…”

Dimensional analysis of motion: VIII. The role of visual discrimination in motion cycles.

“…In addition, the course of learning in each of the component movements in this study appears to be unaltered as a function of the specific discrimination. The differential effects of practice upon different components in a pattern of motion as found in this study have been observed in previous investigations of assembly motions (11), factory operations (2), panel control movements (9,10,12), and visual target tracking (6,7). These differential effects, which have been labeled "learning discrepancy in component movements" (6), consist of difference; in rate of learning, in the course of learning and in the over-all change resulting from learning for travel and manipulative movements.…”

Dimensional analysis of motion: X. Experimental evaluation of a time-study problem.

“…Several studies (2,4,5,6,7,8) have been conducted thus far which show that there are grave limitations in the concept of independent movement elements, to which a standard of fixed time can be assigned as a result of measurement. The work thus far conducted along this line has involved observation of the differential effects of learning, of fatigue, of perception, and of the distance of movement upon the separate therbligs making up a motion.…”