(4) mean errors increase but constant errors decrease with speed-increase.
Individual records show:
(1) less violent fluctuations of errors in all respects than do the results of head or hands, for vertical foot-movements are of less extreme extent than are arm- or head-motions;
(2) that for visual control with mean errors, no foot is the more accurate, and there is no reason to believe that the feet are unequally educated.
1 cm. records show, as far as mean errors are concerned, that:
(1) visual control is of no value as either reducing actual errors or as effecting greater regularity;
(2) Errors for foot-movements are no less, but considerably more regular than for head-motions;
(3) errors for hand-movements are more regular, and only 50% of the results for either head- or foot-movements;
(4) all curves are horizontal;