Abstract：
:Delays in sensorimotor loops have led to the proposal that reaching movements are primarily under pre-programmed control and that sensory feedback loops exert an influence only at the very end of a trajectory. The present review challenges this view. Although behavioral data suggest that a motor plan is assembled prior to the onset of movement, more recent studies have indicated that this initial plan does not unfold unaltered, but is updated continuously by internal feedback loops. These loops rely on a forward model that integrates the sensory inflow and motor outflow to evaluate the consequence of the motor commands sent to a limb, such as the arm. In such a model, the probable position and velocity of an effector can be estimated with negligible delays and even predicted in advance, thus making feedback strategies possible for fast reaching movements. The parietal lobe and cerebellum appear to play a crucial role in this process. The ability of the motor system to estimate the future state of the limb might be an evolutionary substrate for mental operations that require an estimate of sequelae in the immediate future.
journal_name
Trends Cogn Scijournal_title
Trends in cognitive sciencesauthors
Desmurget M,Grafton Sdoi
10.1016/s1364-6613(00)01537-0subject
Has Abstractpub_date
2000-11-01 00:00:00pages
423-431issue
11eissn
1364-6613issn
1879-307Xpii
S1364-6613(00)01537-0journal_volume
4pub_type
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journal_title：Trends in cognitive sciences
pub_type： 评论,杂志文章
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