While these results await empirical validation, they raise interesting questions. To inhibit reflexes, what are the contributions of descending commands vs. local interactions? And do under-controlled reflexes contribute to slow/altered limb trajectories in movement disorders, including PD? (4/4)

(2) Two modeled mechanisms (coordinated activation of α- and γ-motoneurons, or inhibition of γ-motoneurons by α-motoneuron collaterals) can effectively reduce such disruption. (3) However, neither mechanism is, in their words, a panacea -- meaningful disruption remained for some reaches. (3/4)

Niyo et al. ask whether/how the nervous system prevents velocity-dependent stretch reflexes from disrupting voluntary movement. Observations from their model of a macaque arm: (1) Left disinhibited, stretch reflexes would substantially disrupt movements.
(2/4)

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