Because the velocity of a movement is larger when a movement is sped up, decreasing the movement time for a task increases timing error.

Question

BlackTom AI · Accepted Answer

In tasks involving movement, there is a relationship between how fast you move and how precisely you time the action. 
Option 1: True. The claim that velocity increases when movement is sped up is generally correct, since faster movements involve higher motor commands and shorter reaction/execution windows. When you try to complete a task in less time, you reduce the available temporal margin, which often leads to larger timing deviations from the intended target. This aligns with the classic speed–accuracy trade-off: pushing for shorter movement time tends to worsen timing precision, even if spatial accuracy can sometimes be maintained or even improved with practice. 
Option 2: False. If one argued that decreasing movement time never affects timing error, this would ignore the temporal constraints that come with rapid actions. There are scenarios where timing can be preserved through pacing, anticipation, or external feedback, but the general principle in motor control literature is that increasing speed tends to increase timing variability, not decrease it. Therefore the statement claiming a decrease in movement time always avoids timing error would be unsupported. 
Overall, the reasoning reflects that increasing speed (decreasing movement time) typically compromises timing accuracy due to the speed–accuracy trade-off, rather than eliminating timing errors.

KINE-3650-001 (Fall 2025) Assessment 2 - Requires Respondus LockDown Browser

Because the velocity of a movement is larger when a movement is sped up, decreasing the movement time for a task increases timing error.

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