Amplitude, Position, Timing and Velocity as Cues in Reproduction of Movement

In three experiments the method of average error was used to study the reproductions of amplitudes of standard horizontal arm movements ranging from 45° to 125°. Response sensitivity, in terms of mean difference limens and absolute errors, was relatively precise and constant over the range of movement. However, constant errors exhibited a definite trend in that small movements were constantly overestimated and large ones were underestimated. It was also found that the starting and terminal positions of a movement were important cues in movement reproduction, whereas timing ability and movement velocity seemed unrelated to accuracy.