Moving Backgrounds and Manual Control

Moving Backgrounds and Manual Control

Recent accounts describe the online control of goal directed movement as collaboration between processes of predictive forward-modeled control and spatiotemporally constrained feedback-driven control. Two experiments are presented that evaluate the impact background motion has on these two control processes. In each experiment, performers made aiming movements over backgrounds that translated i...

Effects of stationary and moving textured backgrounds on the visuo-oculo-manual tracking in humans

We investigated the effects of stationary and moving textured backgrounds on ocular and manual pursuit of a discrete target that suddenly starts to move at constant speed (ramp motion). When a stationary textured background was superimposed to the target displacement, the gain of the steady-state eye smooth pursuit velocity was significantly reduced, while the latency of pursuit initiation did ...

How Moving Backgrounds Influence Interception

Reaching movements towards an object are continuously guided by visual information about the target and the arm. Such guidance increases precision and allows one to adjust the movement if the target unexpectedly moves. On-going arm movements are also influenced by motion in the surrounding. Fast responses to motion in the surrounding could help cope with moving obstacles and with the consequenc...

Quantification of manual force control and tremor.

Isometric impulse frequencies associated with active tremor and force regulation were examined in 10 patients with idiopathic Parkinson's disease (PD) and in 10 older adults (OAs) who performed an isometric tracing task. The authors decoupled and analyzed the data to determine whether PD-related tremor in the thumb and in the index finger during isometric force control are related and whether P...

Plague manual--epidemiology, distribution, surveillance and control.