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Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology

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https://www.readbyqxmd.com/read/29127826/behavioral-and-neurophysiological-mechanisms-underlying-motor-skill-learning-in-patients-with-post-stroke-hemiparesis
#1
Shailesh Kantak, Robert McGrath, Nazaneen Zahedi, Dustin Luchmee
OBJECTIVE: Given the presence of execution deficits after stroke, it is difficult to determine if patients with stroke have deficits in motor skill learning with the paretic arm. Here, we controlled for execution deficits while testing practice effects of the paretic arm on motor skill learning, long-term retention, and corticospinal excitability. METHODS: Ten patients with unilateral stroke and ten age-matched controls practiced a kinematic arm skill for two days and returned for retention testing one-day and one-month post-practice...
November 8, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29126720/stimulus-response-and-excitability-what-is-new
#2
LETTER
David Burke, Matthew C Kiernan
No abstract text is available yet for this article.
November 7, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29145168/frontal-infraslow-activity-marks-the-motor-spasms-of-anti-lgi1-encephalitis
#3
Richard Wennberg, Claude Steriade, Robert Chen, Danielle Andrade
OBJECTIVE: The clinical and electrographic features of seizures in anti-LGI1 encephalitis are distinct from those seen in other autoimmune encephalitides or non-encephalitic epilepsies. One electroclinical phenomenon specific to the condition consists of lateralized motor spasms, known as faciobrachial dystonic seizures (FBDS). An electrodecremental pattern overriding a "DC shift" has been described as the EEG correlate of these spasms. We sought to further characterize this pre-spasm infraslow activity (ISA)...
October 28, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29145167/contraction-response-to-muscle-percussion-a-reappraisal-of-the-mechanism-of-this-bedside-test
#4
Christoph Czarnetzki, André Truffert, Abdelhafid Mekideche, Antoine Poncet, Christopher Lysakowski, Martin R Tramèr, Michel R Magistris
OBJECTIVE: To study whether the contraction evoked by muscle percussion stems from the excitation of the muscle or of the nerve and to discuss the changes of this response in neuromuscular disorders. METHODS: In 30 neurologically healthy patients undergoing surgery (for ear, nose, or throat problems unrelated to the study) under general anesthesia with propofol and sufentanil we measured with an electrogoniometer the maximal dorsiflexion of the ankle evoked by reflex hammer percussion of the tibialis anterior muscle before and under neuromuscular junction blockade with rocuronium bromide...
October 28, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29145166/revisiting-interhemispheric-imbalance-in-chronic-stroke-a-tdcs-study
#5
Alana B McCambridge, James W Stinear, Winston D Byblow
OBJECTIVE: Chronic stroke patients with moderate-severe motor impairment may have an increased reliance on contralesional vs ipsilesional motor areas to control the paretic arm. We hypothesised that increasing contralesional excitability with anodal transcranial direct current stimulation (a-tDCS) would benefit motor performance in patients with moderate-severe impairment. METHODS: Ten patients with motor impairment at the chronic stage after stroke received a-tDCS, cathodal (c-tDCS) and sham with the target electrode over contralesional motor cortex (M1)...
October 28, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29089183/corrigendum-to-graph-analysis-of-eeg-resting-state-functional-networks-in-dyslexic-readers-clin-neurophysiol-127-9-2016-3165-3175
#6
G Fraga González, M J W Van der Molen, G Žarić, M Bonte, J Tijms, L Blomert, C J Stam, M W Van der Molen
No abstract text is available yet for this article.
October 28, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29133068/reply-to-stimulus-response-and-excitability-what-is-new
#7
LETTER
François Charles Wang
No abstract text is available yet for this article.
October 27, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29113719/utilization-of-independent-component-analysis-for-accurate-pathological-ripple-detection-in-intracranial-eeg-recordings-recorded-extra-and-intra-operatively
#8
Shoichi Shimamoto, Zachary J Waldman, Iren Orosz, Inkyung Song, Anatol Bragin, Itzhak Fried, Jerome Engel, Richard Staba, Ashwini Sharan, Chengyuan Wu, Michael R Sperling, Shennan A Weiss
OBJECTIVE: To develop and validate a detector that identifies ripple (80-200 Hz) events in intracranial EEG (iEEG) recordings in a referential montage and utilizes independent component analysis (ICA) to eliminate or reduce high-frequency artifact contamination. Also, investigate the correspondence of detected ripples and the seizure onset zone (SOZ). METHODS: iEEG recordings from 16 patients were first band-pass filtered (80-600 Hz) and Infomax ICA was next applied to derive the first independent component (IC1)...
October 25, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29122445/a-method-for-the-topographical-identification-and-quantification-of-high-frequency-oscillations-in-intracranial-electroencephalography-recordings
#9
Zachary J Waldman, Shoichi Shimamoto, Inkyung Song, Iren Orosz, Anatol Bragin, Itzhak Fried, Jerome Engel, Richard Staba, Michael R Sperling, Shennan A Weiss
OBJECTIVE: To develop a reliable software method using a topographic analysis of time-frequency plots to distinguish ripple (80-200 Hz) oscillations that are often associated with EEG sharp waves or spikes (RonS) from sinusoid-like waveforms that appear as ripples but correspond with digital filtering of sharp transients contained in the wide bandwidth EEG. METHODS: A custom algorithm distinguished true from false ripples in one second intracranial EEG (iEEG) recordings using wavelet convolution, identifying contours of isopower, and categorizing these contours into sets of open or closed loop groups...
October 21, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29122444/cerebellum-and-dystonia-the-story-continues-will-the-patients-benefit-from-new-discoveries
#10
EDITORIAL
Martin Bareš, Pavel Filip
No abstract text is available yet for this article.
October 21, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29136550/cerebellar-transcranial-direct-current-stimulation-improves-adaptive-postural-control
#11
Peter Poortvliet, Billie Hsieh, Andrew Cresswell, Jacky Au, Marcus Meinzer
OBJECTIVE: Rehabilitation interventions contribute to recovery of impaired postural control, but it remains a priority to optimize their effectiveness. A promising strategy may involve transcranial direct current stimulation (tDCS) of brain areas involved in fine-tuning of motor adaptation. This study explored the effects of cerebellar tDCS (ctDCS) on postural recovery from disturbance by Achilles tendon vibration. METHODS: Twenty-eight healthy volunteers participated in this sham-ctDCS controlled study...
October 20, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29136549/the-spectrum-of-charcot-marie-tooth-disease-due-to-myelin-protein-zero-an-electrodiagnostic-nerve-ultrasound-and-histological-study
#12
Gian Maria Fabrizi, Stefano Tamburin, Tiziana Cavallaro, Ilaria Cabrini, Moreno Ferrarini, Federica Taioli, Francesca Magrinelli, Giampietro Zanette
OBJECTIVE: Nerve ultrasound (US) data on myelin protein zero (MPZ)-related Charcot-Marie-Tooth disease (CMT) are lacking. To offer a comprehensive perspective on MPZ-related CMTs, we combined nerve US with clinics, electrodiagnosis and histopathology. METHODS: We recruited 36 patients (12 MPZ mutations), and correlated nerve US to clinical, electrodiagnostic measures, and sural nerve biopsy. RESULTS: According to motor nerve conduction velocity (MNCV) criteria, nine patients were categorized as "demyelinating" CMT1B, 17 as "axonal" CMT2I/J, and 10 as dominant "intermediate" CMTDID...
October 20, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29102873/cervical-vestibular-evoked-myogenic-potential-tuning-properties-of-patients-with-recurrent-peripheral-vestibulopathy-is-it-meniere-s-disease-without-hearing-loss
#13
LETTER
Toshihisa Murofushi, Masahito Tsubota, Ryota Suizu, Eriko Yoshimura
No abstract text is available yet for this article.
October 20, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29101845/motor-cortex-excitability-in-seizure-free-stx1b-mutation-carriers-with-a-history-of-epilepsy-and-febrile-seizures
#14
Maria-Ioanna Stefanou, Debora Desideri, Justus Marquetand, Paolo Belardinelli, Christoph Zrenner, Holger Lerche, Ulf Ziemann
OBJECTIVE: Mutations in STX1B encoding the presynaptic protein syntaxin-1B are associated with febrile seizures with or without epilepsy. It is unclear to what extent these mutations are linked to abnormalities of cortical glutamatergic or GABAergic neurotransmission. We explored this question using single- and paired-pulse transcranial magnetic stimulation (TMS) excitability markers. METHODS: We studied nine currently asymptomatic adult STX1B mutation carriers with history of epilepsy and febrile seizures, who had been seizure-free for at least eight years without antiepileptic drug treatment, and ten healthy age-matched controls...
October 20, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29101844/early-corticospinal-tract-damage-in-prodromal-sca2-revealed-by-eeg-emg-and-emg-emg-coherence
#15
Luis Velázquez-Pérez, Johannes Tünnerhoff, Roberto Rodríguez-Labrada, Reidenis Torres-Vega, Yusely Ruiz-Gonzalez, Paolo Belardinelli, Jacqueline Medrano-Montero, Nalia Canales-Ochoa, Yanetza González-Zaldivar, Yaimeé Vazquez-Mojena, Georg Auburger, Ulf Ziemann
OBJECTIVE: Clinical data suggest early involvement of the corticospinal tract (CST) in spinocerebellar ataxia type 2 (SCA2). Here we tested if early CST degeneration can be detected in prodromal SCA2 mutation carriers by electrophysiological markers of CST integrity. METHODS: CST integrity was tested in 15 prodromal SCA2 mutation carriers, 19 SCA2 patients and 25 age-matched healthy controls, using corticomuscular (EEG-EMG) and intermuscular (EMG-EMG) coherence measures in upper and lower limb muscles...
October 20, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29136548/wavelet-coherence-analysis-a-new-approach-to-distinguish-organic-and-functional-tremor-types
#16
G Kramer, A M M Van der Stouwe, N M Maurits, M A J Tijssen, J W J Elting
OBJECTIVE: To distinguish tremor subtypes using wavelet coherence analysis (WCA). WCA enables to detect variations in coherence and phase difference between two signals over time and might be especially useful in distinguishing functional from organic tremor. METHODS: In this pilot study, polymyography recordings were studied retrospectively of 26 Parkinsonian (PT), 26 functional (FT), 26 essential (ET), and 20 enhanced physiological (EPT) tremor patients. Per patient one segment of 20 s in duration, in which tremor was present continuously in the same posture, was selected...
October 14, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29096220/ear-eeg-detects-ictal-and-interictal-abnormalities-in-focal-and-generalized-epilepsy-a-comparison-with-scalp-eeg-monitoring
#17
I C Zibrandtsen, P Kidmose, C B Christensen, T W Kjaer
OBJECTIVE: Ear-EEG is recording of electroencephalography from a small device in the ear. This is the first study to compare ictal and interictal abnormalities recorded with ear-EEG and simultaneous scalp-EEG in an epilepsy monitoring unit. METHODS: We recorded and compared simultaneous ear-EEG and scalp-EEG from 15 patients with suspected temporal lobe epilepsy. EEGs were compared visually by independent neurophysiologists. Correlation and time-frequency analysis was used to quantify the similarity between ear and scalp electrodes...
October 12, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29096217/neuronopathy-and-neuropathy-in-autosomal-dominant-spino-cerebellar-ataxia-sca-a-preliminary-peripheral-nerve-ultrasound-study
#18
LETTER
Luciana Pelosi, Eoin Mulroy, Miriam J Rodrigues, Richard H Roxburgh
No abstract text is available yet for this article.
October 12, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29102232/added-clinical-value-of-the-inferior-temporal-eeg-electrode-chain
#19
Anders Bach Justesen, Ann Berit Eskelund Johansen, Noomi Ida Martinussen, Danielle Wasserman, Daniella Terney, Pirgit Meritam, Elena Gardella, Sándor Beniczky
OBJECTIVE: To investigate the diagnostic added value of supplementing the 10-20 EEG array with six electrodes in the inferior temporal chain. METHODS: EEGs were recorded with 25 electrodes: 19 positions of the 10-20 system, and six additional electrodes in the inferior temporal chain (F9/10, T9/10, P9/10). Five-hundred consecutive standard and sleep EEG recordings were reviewed using the 10-20 array and the extended array. We identified the recordings with EEG abnormalities that had peak negativities at the inferior temporal electrodes, and those that only were visible at the inferior temporal electrodes...
October 7, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29096219/eye-movements-in-genetic-parkinsonisms-affecting-the-%C3%AE-synuclein-park9-and-manganese-network
#20
LETTER
Elena Pretegiani, Francesca Rosini, Antonio Federico, Lance M Optican, Alessandra Rufa
No abstract text is available yet for this article.
October 7, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
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