Previous work on the approach trajectories of hands to targets in tracking and aiming tasks had produced contradictory evidence about the shape of these curves. This paper shows that these trajectories are a function of the level of practice of the subject; an interpretation in terms of the theory of intermittent control of movements is advanced. Previous contradictory data can be resolved by reference to the subjects/ level of practice. In addition, this theory will encompass the differences between accurate and free movement trajectories reported earlier.
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References
1.
AnnettJ.GolbyC. W.KayH. (1958). The measurement of elements in an assembly task—the information output of the human motor system. Quarterly Journal of Experimental Psychology10, 1–11.
2.
BeggsW. D. A.HowarthC. I. (1970). Movement control in a repetitive motor task. Nature225, 752–3.
3.
BeggsW. D. A.HowarthC. I. (1972). The accuracy of aiming at a target—some further evidence for intermittent control. Acta Psychologica. (In press.).
4.
CrossmanE. R. F. W.GoodeveP. J. (1963). Feedback control of hand-movement and Fitts' LawOxford Unpublished communication to Experimental Psychology Society.
5.
EdwardsE. (1965). Research note on the study of hand motions. Perceptual and Motor Skills20, 1098.
6.
HowarthC. I.BeggsW. D. A.BowdenJ. (1971). The relationship between speed and accuracy of movement aimed at a target. Acta Psychologica35, 207–18.
7.
LowryS. M.MaynardH. B.StegmertenG. J. (1948). Reported in Murrell, K. F. H. and Entwisle, D. G. (1960).
8.
MurrellK. F. H.EntwisleD. G. (1960). Age difference in movement pattern. Nature185, 948.
9.
PetersW.WenborneA. A. (1936). The time pattern of voluntary movements. British Journal of Psychology26, 388–406; 27, 60–73.
10.
TaylorF. V. (1947). A study of the acceleration pattern of manual corrective responses. American Psychologist2, 340.
11.
TaylorF. V.BirminghamH. P. (1948). Studies of tracking behavior, II. The acceleration pattern of quick manual corrective responses. Journal of Experimental Psychology38, 783–95.
12.
VinceM. A. (1948). Corrective movements in a pursuit task. Quarterly Journal of Experimental Psychology1, 85–106.
13.
WoodworthR. S. (1899). The accuracy of voluntary movement. Psychological Review Monograph Supplement3, 13.
