How we feel fatigue and force

Sluggish sensations caused by delayed visual feedback have a critical impact on user experiences of interactive network services such as network games. Here we report that motor perception can be affected by delayed visual feedback in various ways depending on the situation. When an image of a finger was delayed compared with its actual movement, subjects reported a stronger sense of fatigue. When a cursor was delayed, subjects reported a resistive sensation as if they were pulling a mechanical load. The study sheds light on the role of vision in motor perception, and may provide an important clue regarding interface design.