TY - JOUR
T1 - An equilibrium-point model for fast, single-joint movement
T2 - I. Emergence of strategy-dependent emg patterns
AU - Latash, Mark L.
AU - Gottlieb, Gerald L.
N1 - Funding Information:
We are grateful to Dr. R. D. Penn for financial support. This work was partially supported by NIH grants NS 15630, AR 33189, and American Paralysis Association grant, LAI-8901-1.
PY - 1991/9
Y1 - 1991/9
N2 - We describe a model for the regulation of fast, single-joint movements, based on the equilibrium-point hypothesis. Limb movement follows constant rate shifts of independently regulated neuromuscular variables. The independently regulated variables are tentatively identified as thresholds of a length-sensitive reflex for each of the participating muscles. We use the model to predict EMG patterns associated with changes in the conditions of movement execution, specifically, changes in movement times, velocities, amplitudes, and moments of limb inertia. The approach provides a theoretical neural framework for the dual-strategy hypothesis, which considers certain movements to be results of one of two basic, speed-sensitive or speed-insensitive strategies. This model is advanced as an alternative to pattern-imposing models based on explicit regulation of timing and amplitudes of signals that are explicitly manifest in the EMG paterns. The EMG patterns for fast movements predicted by the model are compared with published experimental observations.
AB - We describe a model for the regulation of fast, single-joint movements, based on the equilibrium-point hypothesis. Limb movement follows constant rate shifts of independently regulated neuromuscular variables. The independently regulated variables are tentatively identified as thresholds of a length-sensitive reflex for each of the participating muscles. We use the model to predict EMG patterns associated with changes in the conditions of movement execution, specifically, changes in movement times, velocities, amplitudes, and moments of limb inertia. The approach provides a theoretical neural framework for the dual-strategy hypothesis, which considers certain movements to be results of one of two basic, speed-sensitive or speed-insensitive strategies. This model is advanced as an alternative to pattern-imposing models based on explicit regulation of timing and amplitudes of signals that are explicitly manifest in the EMG paterns. The EMG patterns for fast movements predicted by the model are compared with published experimental observations.
UR - http://www.scopus.com/inward/record.url?scp=84952497643&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84952497643&partnerID=8YFLogxK
U2 - 10.1080/00222895.1991.10118360
DO - 10.1080/00222895.1991.10118360
M3 - Article
C2 - 14766514
AN - SCOPUS:84952497643
SN - 0022-2895
VL - 23
SP - 163
EP - 177
JO - Journal of motor behavior
JF - Journal of motor behavior
IS - 3
ER -