Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology
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For intra-operative subcortical electrical stimulation of the corticospinal tract, two techniques - originally described for cortical stimulation - have evolved: the 50-Hz-stimulation first described by Penfield in 1937 and the high-frequency multipulse train stimulation technique first described by Taniguchi in 1993. Motor thresholds of both methods in combination with a bipolar and monopolar stimulation technique and their reliability for eliciting motor evoked potentials (MEPs) were studied. ⋯ Subcortical stimulation with a monopolar probe and a multipulse stimulation is most efficient for the purpose of identifying the corticospinal tract. This is explained by the more radiant electric field properties of the monopolar probe compared to the bipolar probe.
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Editorial Comment
Subcortical stimulation (mapping) of the corticospinal tract.
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Comparative Study
A blinded comparison of continuous versus sampled review of video-EEG monitoring data.
While there are well-established guidelines for optimum video-EEG monitoring (VEM), the process of reviewing VEM data varies amongst centres. In this study, we compared continuous with sampled reviewing of VEM data to assess whether their diagnostic yield differs. ⋯ Sampled review of VEM data captures sufficient data to reliably make accurate clinical decisions. It may be considered as a more cost and labor efficient alternative to continuous review.
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Paired associative stimulation (PAS) modulates bilateral distal lower limb motor pathways during walking. We assessed the effects of inhibitory PAS applied to the vastus medialis (VM) motor pathways of chronic stroke patients. ⋯ The study has important implications for the development of therapies involving non-invasive brain stimulation to modify abnormal motor behavior following stroke.
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The present study examined the differential effects of voice auditory feedback perturbation direction and magnitude on voice fundamental frequency (F(0)) responses and event-related potentials (ERPs) from EEG electrodes on the scalp. ⋯ The findings of interactive effects between the magnitude and direction of voice feedback pitch perturbation on N1 and P2 ERP components indicate that the neural mechanisms underlying error detection and correction in voice pitch auditory feedback are differentially sensitive to both the magnitude and direction of pitch perturbations.