Details:

Alternative Title:
Neuron
Publisher's site:
http://dx.doi.org/10.1016/j.neuron.2011.05.047
Personal Author:
Afshar, Afsheen ; Santhanam, Gopal ; Yu, Byron M. ; Ryu, Stephen I. ; Sahani, Maneesh ; ... More +
Afshar, Afsheen ; Santhanam, Gopal ; Yu, Byron M. ; Ryu, Stephen I. ; Sahani, Maneesh ; Shenoy, Krishna V. Less -
Description:
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.
Subject:
[+]
Animals
Arm
Article
Electrophysiology
Fixation, Ocular
Macaca Mulatta
Microelectrodes
Models, Neurological
Motor Cortex
Movement
Neurons
Psychomotor Performance
Reaction Time

Source:
Neuron. 2011; 71(3):555-564.
Pubmed ID:
21835350
Pubmed Central ID:
PMC3155684
Document Type:
Journal Article
Funding:
1DP10D006409/DP/NCCDPHP CDC HHS/United States ; R01 NS054283/NS/NINDS NIH HHS/United States ; R01 NS054283-05/NS/NINDS NIH HHS/United States ; R01-NS054283/NS/NINDS NIH HHS/United States
1DP10D006409/DP/NCCDPHP CDC HHS/United States ; R01 NS054283/NS/NINDS NIH HHS/United States ; R01 NS054283-05/NS/NINDS NIH HHS/United States ; R01-NS054283/NS/NINDS NIH HHS/United States Less -
Collection(s):
CDC Public Access
Main Document Checksum:
[+]
urn:sha256:4247ba727b0e5a37ef46353f6123c74daebdd27ba72663ea39704df7d80b25fd
File Type:

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