If a movement is __________, instructions to decrease movement time have a detrimental effect on spatial accuracy.

Question

BlackTom AI · Accepted Answer

The question asks about a condition under which instructions to decrease movement time would harm spatial accuracy. 
Option 1: 'relatively slow' — If movements are already slow, telling someone to move even faster would push them toward a speed-accuracy trade-off where accuracy could suffer, but the hallmark scenario given in motor control is most directly observed when movements are already fast. This option does not best capture the typical relation described. 
Option 2: 'relatively fast' — When movements are already fast, imposing a further decrease in movement time tends to exacerbate spatial errors due to reduced planning and online correction time. This aligns with the speed-accuracy trade-off principle: faster movements generally come at the cost of precision, and additional pressure to move quickly typically degrades spatial accuracy. 
Option 3: 'well learned' — If a movement is well learned, performance is more automatic and robust to speed changes; instructions to move faster might have less detrimental effect on accuracy, making this option unlikely to describe the specified condition. 
Option 4: 'without vision' — Lack of vision affects online error correction and feedback, but the statement about detrimental effects from decreasing movement time is not inherently tied to vision status. While vision can influence accuracy, the core idea in motor control about speed-accuracy interaction is not uniquely defined by vision absence. 
Taking all options together, the description that best matches the condition where reducing movement time would harm spatial accuracy is the 'relatively fast' case, since faster-than-preferred movements are most susceptible to accuracy losses under time constraints.

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

If a movement is __________, instructions to decrease movement time have a detrimental effect on spatial accuracy.

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