Abstract：
:Movements are universally, sometimes frustratingly, variable. When such variability causes error, we typically assume that something went wrong during the movement. The same assumption is made by recent and influential models of motor control. These posit that the principal limit on repeatable performance is neuromuscular noise that corrupts movement as it occurs. An alternative hypothesis is that movement variability arises before movements begin, during motor preparation. We examined this possibility directly by recording the preparatory activity of single cortical neurons during a highly practiced reach task. Small variations in preparatory neural activity were predictive of small variations in the upcoming reach. Effect magnitudes were such that at least half of the observed movement variability likely had its source during motor preparation. Thus, even for a highly practiced task, the ability to repeatedly plan the same movement limits our ability to repeatedly execute the same movement.
journal_name
Neuronjournal_title
Neuronauthors
Churchland MM,Afshar A,Shenoy KVdoi
10.1016/j.neuron.2006.10.034subject
Has Abstractpub_date
2006-12-21 00:00:00pages
1085-96issue
6eissn
0896-6273issn
1097-4199pii
S0896-6273(06)00871-3journal_volume
52pub_type
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