visual control is of doubtful advantage, for left-handed subjects, but shows a clearly marked reduction of error for right-handed subjects.
Mean errors are:
(1) similar in all respects to free-movement results;
(2) acceleration-curves are closer to free-movement results than are retardation records;
(3) the more trained hand shows reducing error for speed-increase, while the other hand shows increasing errors, because of superiority of practice-effects over the native tendency to increase error as speed-rate rises, for the more dexterous hand alone.
Constant errors:
(1) there is no tendency to overrule, as compared with free movements, when weight acts to accelerate movements, for there are even cases of lines being shortened with accelerating weights;
(2) a weight seems to negate the results of visual control, as a rule.
For individual records we find:
(1) fatigue-points, for the right hand only, are to be found in a few cases;