Neural Comput - How the brain generates movement.

Tópicos

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Resumo

In this study, we assume that the brain uses a general-purpose pattern generator to transform static commands into basic movement segments. We hypothesize that this pattern generator includes an oscillator whose complete cycle generates a single movement segment. In order to demonstrate this hypothesis, we construct an oscillator-based model of movement generation. The model includes an oscillator that generates harmonic outputs whose frequency and amplitudes can be modulated by external inputs. The harmonic outputs drive a number of integrators, each activating a single muscle. The model generates muscle activation patterns composed of rectilinear and harmonic terms. We show that rectilinear and fundamental harmonic terms account for known properties of natural movements, such as the invariant bell-shaped hand velocity profile during reaching. We implement these dynamics by a neural network model and characterize the tuning properties of the neural integrator cells, the neural oscillator cells, and the inputs to the system. Finally, we propose a method to test our hypothesis that a neural oscillator is a central component in the generation of voluntary movement.

Resumo Limpo

studi assum brain use generalpurpos pattern generat transform static command basic movement segment hypothes pattern generat includ oscil whose complet cycl generat singl movement segment order demonstr hypothesi construct oscillatorbas model movement generat model includ oscil generat harmon output whose frequenc amplitud can modul extern input harmon output drive number integr activ singl muscl model generat muscl activ pattern compos rectilinear harmon term show rectilinear fundament harmon term account known properti natur movement invari bellshap hand veloc profil reach implement dynam neural network model character tune properti neural integr cell neural oscil cell input system final propos method test hypothesi neural oscil central compon generat voluntari movement

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