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Noninvasive brain stimulation (NIBS) using either transcranial magnetic stimulation (TMS) or transcranial direct-current stimulation (tDCS) can improve motor function after stroke or brain injury. Most studies have focused on relatively low-level motor function (e.g., grip strength). Less is known about the effects of NIBS on higher-level motor function.
In this controlled pilot study, researchers compared treatment with tDCS applied to two locations (posterior parietal cortex [PPC] and primary motor cortex [M1]) and with sham stimulation in 6 patients with left posterior parietal cortex (PPC) damage and ideomotor limb apraxia and in 6 healthy control participants. All patients had variable injury, at least 1 month before stimulation, to the…