Cortical tremor (CT), a rhythmic variant of cortical myoclonus (CM), is the hallmark of benign adult familial myoclonus epilepsy (BAFME), though the underlying mechanism of rhythmicity remains unproven. This study aimed to reveal the cortical rhythmic activity of CT using induced activity analysis for somatosensory evoked potentials (SEP).
Methods
We investigated 46 SEP datasets from 23 patients (11 with BAFME, 12 with other CM) and 35 SEPs from 18 healthy controls. SEPs were recorded by 1.1-Hz stimuli at a sampling rate of 10,000 Hz. A short-time Fourier transform was applied to each SEP epoch, and the power spectrums were averaged. We set an analysis window of 0–150 ms and a frequency range of 0–1,000 Hz for time–frequency representation and compared the induced power changes between groups.
Results
Stimulus-induced power changes over a wide-band (0–1000 Hz) were conspicuously prominent in BAFME patients compared to both CM and controls. These activities presented repetitive and alternating increases and decreases in power and its total number of induced activities were the highest in age 40s and declined with aging.
Conclusions
We demonstrated rhythmic cortical activity in BAFME patients, which may reflect the underlying pathophysiology of CT.
Significance
Detecting the induced activity of a single somatosensory stimulus may offer novel insights into the pathophysiology of BAFME.
{"title":"Repetitive wide-band cortical power in benign adult familial myoclonus epilepsy","authors":"Haruo Yamanaka , Katsuya Kobayashi , Takefumi Hitomi , Maya Tojima , Masao Matsuhashi , Kiyohide Usami , Ryosuke Takahashi , Akio Ikeda","doi":"10.1016/j.clinph.2025.2111486","DOIUrl":"10.1016/j.clinph.2025.2111486","url":null,"abstract":"<div><h3>Background</h3><div>Cortical tremor (CT), a rhythmic variant of cortical myoclonus (CM), is the hallmark of benign adult familial myoclonus epilepsy (BAFME), though the underlying mechanism of rhythmicity remains unproven. This study aimed to reveal the cortical rhythmic activity of CT using induced activity analysis for somatosensory evoked potentials (SEP).</div></div><div><h3>Methods</h3><div>We investigated 46 SEP datasets from 23 patients (11 with BAFME, 12 with other CM) and 35 SEPs from 18 healthy controls. SEPs were recorded by 1.1-Hz stimuli at a sampling rate of 10,000 Hz. A short-time Fourier transform was applied to each SEP epoch, and the power spectrums were averaged. We set an analysis window of 0–150 ms and a frequency range of 0–1,000 Hz for time–frequency representation and compared the induced power changes between groups.</div></div><div><h3>Results</h3><div>Stimulus-induced power changes over a wide-band (0–1000 Hz) were conspicuously prominent in BAFME patients compared to both CM and controls. These activities presented repetitive and alternating increases and decreases in power and its total number of induced activities were the highest in age 40s and declined with aging.</div></div><div><h3>Conclusions</h3><div>We demonstrated rhythmic cortical activity in BAFME patients, which may reflect the underlying pathophysiology of CT.</div></div><div><h3>Significance</h3><div>Detecting the induced activity of a single somatosensory stimulus may offer novel insights into the pathophysiology of BAFME.</div></div>","PeriodicalId":10671,"journal":{"name":"Clinical Neurophysiology","volume":"183 ","pages":"Article 2111486"},"PeriodicalIF":3.6,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145837697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-17DOI: 10.1016/j.clinph.2025.2111483
Marco Antonio Cavalcanti Garcia , Anaelli Aparecida Nogueira-Campos
{"title":"Revisiting the accuracy of motor evoked potential determination: The overlooked role of surface electrode montage","authors":"Marco Antonio Cavalcanti Garcia , Anaelli Aparecida Nogueira-Campos","doi":"10.1016/j.clinph.2025.2111483","DOIUrl":"10.1016/j.clinph.2025.2111483","url":null,"abstract":"","PeriodicalId":10671,"journal":{"name":"Clinical Neurophysiology","volume":"183 ","pages":"Article 2111483"},"PeriodicalIF":3.6,"publicationDate":"2025-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145788252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Reply to “Revisiting the accuracy of motor evoked potential determination: The overlooked role of surface electrode montage”","authors":"Marten Nuyts , Stefanie Verstraelen , Joana Frieske , Raf Meesen , Sybren Van Hoornweder","doi":"10.1016/j.clinph.2025.2111481","DOIUrl":"10.1016/j.clinph.2025.2111481","url":null,"abstract":"","PeriodicalId":10671,"journal":{"name":"Clinical Neurophysiology","volume":"183 ","pages":"Article 2111481"},"PeriodicalIF":3.6,"publicationDate":"2025-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145832954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-17DOI: 10.1016/j.clinph.2025.2111482
Melker Hagsäter , Jonatan Malmros , Jonas Persson , Jonas Jester-Broms , Robert Bodén
{"title":"The integrity of double-blinding of continuous theta-burst stimulation targeting the supplementary motor area in a within-subjects design","authors":"Melker Hagsäter , Jonatan Malmros , Jonas Persson , Jonas Jester-Broms , Robert Bodén","doi":"10.1016/j.clinph.2025.2111482","DOIUrl":"10.1016/j.clinph.2025.2111482","url":null,"abstract":"","PeriodicalId":10671,"journal":{"name":"Clinical Neurophysiology","volume":"183 ","pages":"Article 2111482"},"PeriodicalIF":3.6,"publicationDate":"2025-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145827109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-16DOI: 10.1016/j.clinph.2025.2111480
Karlo J. Lizarraga , Robert Chen
{"title":"Clinical neurophysiology in movement disorders: toward integration into systems-based practice","authors":"Karlo J. Lizarraga , Robert Chen","doi":"10.1016/j.clinph.2025.2111480","DOIUrl":"10.1016/j.clinph.2025.2111480","url":null,"abstract":"","PeriodicalId":10671,"journal":{"name":"Clinical Neurophysiology","volume":"183 ","pages":"Article 2111480"},"PeriodicalIF":3.6,"publicationDate":"2025-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145780522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-16DOI: 10.1016/j.clinph.2025.2111484
Brin E. Freund , Adrian Safa , Filippo Emanuele Colella , Guido Chiriboga , Toni Betiku , Andy Shar , Cornelia Drees , Jeffrey Britton , Anteneh M. Feyissa , William O. Tatum
Background
Chimeric antigen receptor (CAR) T-cell therapy revolutionized cancer treatment, though has potential for neurotoxicity (immune effector cell-associated neurotoxicity syndrome, ICANS). EEG has been proposed as a predictive and prognostic tool in ICANS.
Objective
Evaluate pre-treatment EEG, neuroimaging, and clinical features in predicting ICANS, and EEG in prognosis in ICANS.
Methods
Retrospective multicenter study involving adult patients who underwent CAR T-cell therapy at Mayo Clinic Florida, Minnesota, and Arizona between October 2019 and July 2024. Univariable, multivariable and survival analyses were performed.
Results
We included 207 patients (111 female). Pre-treatment EEG was performed in 50.2 % of patients. Multivariable analysis of EEG, imaging, and clinical data demonstrated older age (roughly 1 % increased odds per 1 year of increased age, p = 0.006) and generalized slowing on pre-treatment EEG being associated with ICANS (p = 0.021). There were no factors predictive of hospital duration or survival in ICANS using multivariable analysis. Patients with ICANS had longer hospitalization (p < 0.001) and were less likely to survive at 12- and 24-months (p = 0.001, p < 0.001 respectively).
Conclusion
ICANS is associated with longer hospitalization and worse survival. ICANS risk increases with older age. Generalized slowing on pre-treatment EEG may identify patients at risk of ICANS.
Significance
ICANS is associated with worse outcomes and may be predicted by pre-treatment EEG and older age.
{"title":"Is EEG useful in predicting neurotoxicity and outcomes related to chimeric antigen receptor (CAR) T-cell therapy?","authors":"Brin E. Freund , Adrian Safa , Filippo Emanuele Colella , Guido Chiriboga , Toni Betiku , Andy Shar , Cornelia Drees , Jeffrey Britton , Anteneh M. Feyissa , William O. Tatum","doi":"10.1016/j.clinph.2025.2111484","DOIUrl":"10.1016/j.clinph.2025.2111484","url":null,"abstract":"<div><h3>Background</h3><div>Chimeric antigen receptor (CAR) T-cell therapy revolutionized cancer treatment, though has potential for neurotoxicity (immune effector cell-associated neurotoxicity syndrome, ICANS). EEG has been proposed as a predictive and prognostic tool in ICANS.</div></div><div><h3>Objective</h3><div>Evaluate pre-treatment EEG, neuroimaging, and clinical features in predicting ICANS, and EEG in prognosis in ICANS.</div></div><div><h3>Methods</h3><div>Retrospective multicenter study involving adult patients who underwent CAR T-cell therapy at Mayo Clinic Florida, Minnesota, and Arizona between October 2019 and July 2024. Univariable, multivariable and survival analyses were performed.</div></div><div><h3>Results</h3><div>We included 207 patients (111 female). Pre-treatment EEG was performed in 50.2 % of patients. Multivariable analysis of EEG, imaging, and clinical data demonstrated older age (roughly 1 % increased odds per 1 year of increased age, p = 0.006) and generalized slowing on pre-treatment EEG being associated with ICANS (p = 0.021). There were no factors predictive of hospital duration or survival in ICANS using multivariable analysis. Patients with ICANS had longer hospitalization (p < 0.001) and were less likely to survive at 12- and 24-months (p = 0.001, p < 0.001 respectively).</div></div><div><h3>Conclusion</h3><div>ICANS is associated with longer hospitalization and worse survival. ICANS risk increases with older age. Generalized slowing on pre-treatment EEG may identify patients at risk of ICANS.</div></div><div><h3>Significance</h3><div>ICANS is associated with worse outcomes and may be predicted by pre-treatment EEG and older age.</div></div>","PeriodicalId":10671,"journal":{"name":"Clinical Neurophysiology","volume":"183 ","pages":"Article 2111484"},"PeriodicalIF":3.6,"publicationDate":"2025-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145910290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-13DOI: 10.1016/j.clinph.2025.2111478
Wenjie Ming , Yang Zheng , Qi Lian , Chunhong Shen , Yinxi Zhang , Zhongjin Wang , Shuang Wang , Fang Li , Zhe Zheng , Yu Qi , Junming Zhu , Hemmings Wu
Objective
Low-grade epilepsy-associated neuroepithelial tumors (LEATs) often cause drug-resistant epilepsy. Despite complete resection of these lesions, approximately 20% of patients continue to experience suboptimal seizure control. This study aims to investigate the predictive value of quantitative features in determining the surgical outcomes for LEAT patients.
Methods
We retrospectively analyzed 44 temporal LEAT patients who underwent gross-total lesionectomy. EEG features, including power spectral density (PSD) and weighted phase lag index (wPLI), were compared between patients with good (Engel I) and poor (Engel II-IV) outcomes. Significant EEG features were identified through these analyses. Domain Adversarial Neural Network (DANN) was employed to assess the predictive value of these features for surgical outcomes.
Results
No significant PSD differences were found, but patients with good outcomes had higher alpha-band wPLI (p = 0.008). LEATnet, predicted outcomes with an AUC of 0.81and correctly classified 8 of 11 patients in the independent validation cohort.
Conclusions
Alpha-band functional connectivity is a key predictor of surgical outcomes in LEAT patients.
Significance
EEG-based connectivity analysis may improve prognostic accuracy and aid clinical decision-making in LEAT epilepsy.
{"title":"Brain connectivity predict surgical outcomes of low-grade epilepsy-associated neuroepithelial tumors","authors":"Wenjie Ming , Yang Zheng , Qi Lian , Chunhong Shen , Yinxi Zhang , Zhongjin Wang , Shuang Wang , Fang Li , Zhe Zheng , Yu Qi , Junming Zhu , Hemmings Wu","doi":"10.1016/j.clinph.2025.2111478","DOIUrl":"10.1016/j.clinph.2025.2111478","url":null,"abstract":"<div><h3>Objective</h3><div>Low-grade epilepsy-associated neuroepithelial tumors (LEATs) often cause drug-resistant epilepsy. Despite complete resection of these lesions, approximately 20% of patients continue to experience suboptimal seizure control. This study aims to investigate the predictive value of quantitative features in determining the surgical outcomes for LEAT patients.</div></div><div><h3>Methods</h3><div>We retrospectively analyzed 44 temporal LEAT patients who underwent gross-total lesionectomy. EEG features, including power spectral density (PSD) and weighted phase lag index (wPLI), were compared between patients with good (Engel I) and poor (Engel II-IV) outcomes. Significant EEG features were identified through these analyses. Domain Adversarial Neural Network (DANN) was employed to assess the predictive value of these features for surgical outcomes.</div></div><div><h3>Results</h3><div>No significant PSD differences were found, but patients with good outcomes had higher alpha-band wPLI (p = 0.008). LEATnet, predicted outcomes with an AUC of 0.81and correctly classified 8 of 11 patients in the independent validation cohort.</div></div><div><h3>Conclusions</h3><div>Alpha-band functional connectivity is a key predictor of surgical outcomes in LEAT patients.</div></div><div><h3>Significance</h3><div>EEG-based connectivity analysis may improve prognostic accuracy and aid clinical decision-making in LEAT epilepsy.</div></div>","PeriodicalId":10671,"journal":{"name":"Clinical Neurophysiology","volume":"183 ","pages":"Article 2111478"},"PeriodicalIF":3.6,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145788250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-10DOI: 10.1016/j.clinph.2025.2111477
Shokoofeh Parvin , Joona Juurakko , Heikki Sinisalo , Giacinto L. Cerone , Alberto Botter , Risto J. Ilmoniemi , Harri Piitulainen , Victor H. Souza
Objective
To investigate how stimulus orientation, intensity, and interstimulus interval (ISI) in paired-pulse transcranial magnetic stimulation (TMS) influence the spatial activation of motor evoked potentials (MEPs) in forearm flexor muscles.
Methods
Paired-pulse paradigms were applied to the motor cortex using multi-coil TMS (mTMS) to control the stimulus parameters electronically without coil repositioning. MEP spatial activation was recorded with a high-density surface electromyography (HDsEMG) grid over the forearm muscles. Conditioning stimuli (CS) were delivered at anterior-to-medial (0°) and posterior-to-medial (90°) orientations and 70–90 % of resting motor threshold (rMT), followed by test stimuli (TS) at 0° and 110 % rMT. ISIs of 0.5 and 8 ms probed neuronal refractoriness and intracortical facilitation, respectively.
Results
MEPs were facilitated at 8-ms and suppressed at 0.5-ms ISI. At 0.5 ms, changing CS orientation from 0° to 90° reduced suppression. Increasing CS intensity shifted activation centroids medially in most cases. Centroids were more medial at 8 ms and more lateral at 0.5 ms.
Conclusions
TMS pulse orientation, intensity, and ISI systematically affect the magnitude and spatial activation of forearm muscles.
Significance
Our findings highlight the utility of mTMS–HDsEMG in probing neurophysiological mechanisms of corticomotor control with important diagnostic and therapeutic clinical implications.
{"title":"Spatial activation of motor evoked potentials depends on paired-pulse transcranial magnetic stimulation orientation and intensity","authors":"Shokoofeh Parvin , Joona Juurakko , Heikki Sinisalo , Giacinto L. Cerone , Alberto Botter , Risto J. Ilmoniemi , Harri Piitulainen , Victor H. Souza","doi":"10.1016/j.clinph.2025.2111477","DOIUrl":"10.1016/j.clinph.2025.2111477","url":null,"abstract":"<div><h3>Objective</h3><div>To investigate how stimulus orientation, intensity, and interstimulus interval (ISI) in paired-pulse transcranial magnetic stimulation (TMS) influence the spatial activation of motor evoked potentials (MEPs) in forearm flexor muscles.</div></div><div><h3>Methods</h3><div>Paired-pulse paradigms were applied to the motor cortex using multi-coil TMS (mTMS) to control the stimulus parameters electronically without coil repositioning. MEP spatial activation was recorded with a high-density surface electromyography (HDsEMG) grid over the forearm muscles. Conditioning stimuli (CS) were delivered at anterior-to-medial (0°) and posterior-to-medial (90°) orientations and 70–90 % of resting motor threshold (rMT), followed by test stimuli (TS) at 0° and 110 % rMT. ISIs of 0.5 and 8 ms probed neuronal refractoriness and intracortical facilitation, respectively.</div></div><div><h3>Results</h3><div>MEPs were facilitated at 8-ms and suppressed at 0.5-ms ISI. At 0.5 ms, changing CS orientation from 0° to 90° reduced suppression. Increasing CS intensity shifted activation centroids medially in most cases. Centroids were more medial at 8 ms and more lateral at 0.5 ms.</div></div><div><h3>Conclusions</h3><div>TMS pulse orientation, intensity, and ISI systematically affect the magnitude and spatial activation of forearm muscles.</div></div><div><h3>Significance</h3><div>Our findings highlight the utility of mTMS–HDsEMG in probing neurophysiological mechanisms of corticomotor control with important diagnostic and therapeutic clinical implications.</div></div>","PeriodicalId":10671,"journal":{"name":"Clinical Neurophysiology","volume":"183 ","pages":"Article 2111477"},"PeriodicalIF":3.6,"publicationDate":"2025-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145788255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-09DOI: 10.1016/j.clinph.2025.2111473
Simone Russo
{"title":"The price of scientific regulatory misclassification: the case of non-invasive brain stimulation in Europe.","authors":"Simone Russo","doi":"10.1016/j.clinph.2025.2111473","DOIUrl":"https://doi.org/10.1016/j.clinph.2025.2111473","url":null,"abstract":"","PeriodicalId":10671,"journal":{"name":"Clinical Neurophysiology","volume":" ","pages":"2111473"},"PeriodicalIF":3.6,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145751608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}