title: Could cortical signals control intraspinal stimulators? A theoretical evaluation.
abstract: In this paper, we examine the control signals that are required to generate stepping using two different intraspinal microstimulation (ISMS) paradigms and discuss the theoretical feasibility of controlling ISMS-evoked stepping using a brain computer interface. Tonic (constant amplitude) and phasic (modulated amplitude) ISMS protocols were used to produce stepping in the hind limbs of paralyzed cats. Low-amplitude tonic ISMS activated a spinal locomotor-like network that resulted in bilateral stepping of the hind limbs. Phasic ISMS generated coordinated stepping by simultaneously activating flexor synergies in one limb coupled with extensor synergies in the other. Using these ISMS paradigms, we propose that one or two independent cortical signals will be adequate for controlling ISMS-induced stepping after SCI.
authors.affiliation: Department of Biomedical Engineering, Centre for Neuroscience, University of Alberta, Edmonton, AB T6G 2S2, Canada. Vivian.mushahwar@ualberta.ca
authors.forename: Vivian K
authors.initials: VK
authors.lastname: Mushahwar
authors.forename: Lisa
authors.initials: L
authors.lastname: Guevremont
authors.forename: Rajiv
authors.initials: R
authors.lastname: Saigal
mesh_terms: D000818:Animals; D002415:Cats; D002540:Cerebral Cortex / Q000503:physiopathology*; D004599:Electric Stimulation Therapy / Q000379:methods*; D005240:Feasibility Studies; D005246:Feedback; D020233:Gait Disorders, Neurologic / Q000209:etiology / Q000503:physiopathology* / Q000534:rehabilitation*; D008297:Male; D013116:Spinal Cord / Q000503:physiopathology*; D013119:Spinal Cord Injuries / Q000150:complications / Q000503:physiopathology / Q000534:rehabilitation; D013813:Therapy, Computer-Assisted / Q000379:methods; D014584:User-Computer Interface