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- Title
Cortical Effects on Ipsilateral Hindlimb Muscles Revealed with Stimulus-Triggered Averaging of EMG Activity.
- Authors
Messamore, William G.; Van Acker III, Gustaf M.; Hudson, Heather M.; Zhang, Hongyu Y.; Kovac, Anthony; Nazzaro, Jules; Cheney, Paul D.
- Abstract
While a large body of evidence supports the view that ipsilateral motor cortex may make an important contribution to normal movements and to recovery of function following cortical injury (Chollet et al. 1991; Fisher 1992; Caramia et al. 2000; Feydy et al. 2002), relatively little is known about the properties of output frommotor cortex to ipsilateral muscles. Our aim in this studywas to characterize the organization of output effects on hindlimb muscles from ipsilateral motor cortex using stimulus-triggered averaging of EMG activity. Stimulus-triggered averages of EMG activity were computed from microstimuli applied at 60-120 µA to sites in both contralateral and ipsilateral M1 of macaque monkeys during the performance of a hindlimb push-pull task. Although the poststimulus effects (PStEs) from ipsilateral M1 were fewer in number and substantially weaker, clear and consistent effects were obtained at an intensity of 120 µA. The mean onset latency of ipsilateral poststimulus facilitation was longer than contralateral effects by an average of 0.7 ms. However, the shortest latency effects in ipsilateral muscles were as short as the shortest latency effects in the corresponding contralateral muscles suggesting a minimal synaptic linkage that is equally direct in both cases.
- Publication
Cerebral Cortex, 2016, Vol 26, Issue 7, p3036
- ISSN
1047-3211
- Publication type
Article
- DOI
10.1093/cercor/bhv122