Abstract：
:The process by which neural circuitry in the brain plans and executes movements is not well understood. Until recently, most available data were limited either to single-neuron electrophysiological recordings or to measures of aggregate field or metabolism. Neither approach reveals how individual neurons' activities are coordinated within the population, and thus inferences about how the neural circuit forms a motor plan for an upcoming movement have been indirect. Here we build on recent advances in the measurement and description of population activity to frame and test an "initial condition hypothesis" of arm movement preparation and initiation. This hypothesis leads to a model in which the timing of movements may be predicted on each trial using neurons' moment-by-moment firing rates and rates of change of those rates. Using simultaneous microelectrode array recordings from premotor cortex of monkeys performing delayed-reach movements, we compare such single-trial predictions to those of other theories. We show that our model can explain approximately 4-fold more arm-movement reaction-time variance than the best alternative method. Thus, the initial condition hypothesis elucidates a view of the relationship between single-trial preparatory neural population dynamics and single-trial behavior.
journal_name
Neuronjournal_title
Neuronauthors
Afshar A,Santhanam G,Yu BM,Ryu SI,Sahani M,Shenoy KVdoi
10.1016/j.neuron.2011.05.047subject
Has Abstractpub_date
2011-08-11 00:00:00pages
555-64issue
3eissn
0896-6273issn
1097-4199pii
S0896-6273(11)00517-4journal_volume
71pub_type
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