5 resultados para Inojosa, Joaquim, 1901
em Boston University Digital Common
Resumo:
http://www.archive.org/details/callqualificatio00studuoft
Resumo:
http://www.archive.org/details/portraitsofameri00hawarich
Resumo:
http://www.archive.org/details/lastlettersfurth00unknuoft
Resumo:
http://www.archive.org/details/hinduismandchris00bachuoft
Resumo:
We investigated adaptive neural control of precision grip forces during object lifting. A model is presented that adjusts reactive and anticipatory grip forces to a level just above that needed to stabilize lifted objects in the hand. The model obeys priciples of cerebellar structure and function by using slip sensations as error signals to adapt phasic motor commands to tonic force generators associated with output synergies controlling grip aperture. The learned phasic commands are weight and texture-dependent. Simulations of the new curcuit model reproduce key aspects of experimental observations of force application. Over learning trials, the onset of grip force buildup comes to lead the load force buildup, and the rate-of-rise of grip force, but not load force, scales inversely with the friction of the gripped object.