Journal of neurophysiology最新文献

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In vivo magnetic recording of single-neuron action potentials. 单神经元动作电位的体内磁记录。
IF 2.1 3区 医学
Journal of neurophysiology Pub Date : 2025-09-15 DOI: 10.1152/jn.00491.2024
Frederike J Klein, Patrick Jendritza, Chloé Chopin, Mohsen Parto-Dezfouli, Aurélie Solignac, Claude Fermon, Myriam Pannetier-Lecoeur, Pascal Fries
{"title":"<i>In vivo</i> magnetic recording of single-neuron action potentials.","authors":"Frederike J Klein, Patrick Jendritza, Chloé Chopin, Mohsen Parto-Dezfouli, Aurélie Solignac, Claude Fermon, Myriam Pannetier-Lecoeur, Pascal Fries","doi":"10.1152/jn.00491.2024","DOIUrl":"10.1152/jn.00491.2024","url":null,"abstract":"<p><p>Measuring fast neuronal signals is the domain of electrophysiology and magnetophysiology. While electrophysiology is easier to perform, magnetophysiology avoids tissue-based distortions and measures a signal with directional information. At the macroscale, magnetoencephalography (MEG) is established, and at the mesoscale, visually evoked magnetic fields have been reported. At the microscale however, while benefits of recording magnetic counterparts of electric spikes would be numerous, they are also highly challenging <i>in vivo</i>. Here, we combine magnetic and electric recordings of neuronal action potentials in anesthetized, male rats using miniaturized giant magneto-resistance (GMR) sensors. We reveal the magnetic signature of action potentials of well-isolated single units. The recorded magnetic signals showed a distinct waveform and considerable signal strength. This demonstration of <i>in vivo</i> magnetic action potentials opens a wide field of possibilities to profit from the combined power of magnetic and electric recordings and thus to significantly advance the understanding of neuronal circuits.</p>","PeriodicalId":16563,"journal":{"name":"Journal of neurophysiology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145069837","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}
引用次数: 0
Characterizing SEPs from Pacinian-targeted vibrations. 从太平洋目标振动中表征sep。
IF 2.1 3区 医学
Journal of neurophysiology Pub Date : 2025-09-15 DOI: 10.1152/jn.00304.2025
Elena Fuehrer, Lisa Katharina Maurer, Katja Fiehler
{"title":"Characterizing SEPs from Pacinian-targeted vibrations.","authors":"Elena Fuehrer, Lisa Katharina Maurer, Katja Fiehler","doi":"10.1152/jn.00304.2025","DOIUrl":"https://doi.org/10.1152/jn.00304.2025","url":null,"abstract":"<p><p>This study characterizes short- and long-latency somatosensory evoked potentials (SEPs) elicited by high-frequency vibrotactile stimuli. Unlike conventional electrical stimulation, such vibrations selectively recruit Pacinian corpuscles while sparing other mechanoreceptors, motor, proprioceptive, and nociceptive fibers, thereby offering a more ecologically valid proxy for natural touch. We first show that SEP components P45, P100, N140, P200 and P300 scaled systematically with vibration amplitude, and quantify the increase in SEP voltage per increase in peak-to-peak vibration amplitude for suprathreshold stimuli. We then compare vibrotactile SEPs to those produced by perceptually matched electrical stimulations given at the same finger location. The overall morphology of vibrotactile SEPs at contralateral electrode CP3 appeared similar to electrical SEPs from the P45 and onward. However, short-latency components P45 and N70 revealed distinct scalp topographies, indicating different cortical sources for the two stimulation modalities. Source analysis revealed greater early activation (~45 ms) of contralateral primary somatosensory regions while posterior parietal areas and SII showed differential activation for vibrations and electrical stimulations. Later processing and integration of sensory information recruited similar neural sources for both modalities. These findings offer a comprehensive reference for SEP responses to Pacinian-targeted vibrations and highlight the use of naturalistic stimuli in human somatosensory electrophysiology.</p>","PeriodicalId":16563,"journal":{"name":"Journal of neurophysiology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145069835","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}
引用次数: 0
Electrophysiological Evidence of Hebbian Plasticity in Awake Adult Rats. 清醒成年大鼠边缘可塑性的电生理证据。
IF 2.1 3区 医学
Journal of neurophysiology Pub Date : 2025-09-15 DOI: 10.1152/jn.00129.2025
Siddharth S Gaikwad, Yi Chen, Bing Chen, Wil Hd Bogue, Giuseppe Scesa, Matthew S Neehouse, Theresa M Vaughan, Jonathan S Carp, Martin Oudega, Jonathan R Wolpaw, Monica A Perez
{"title":"Electrophysiological Evidence of Hebbian Plasticity in Awake Adult Rats.","authors":"Siddharth S Gaikwad, Yi Chen, Bing Chen, Wil Hd Bogue, Giuseppe Scesa, Matthew S Neehouse, Theresa M Vaughan, Jonathan S Carp, Martin Oudega, Jonathan R Wolpaw, Monica A Perez","doi":"10.1152/jn.00129.2025","DOIUrl":"https://doi.org/10.1152/jn.00129.2025","url":null,"abstract":"<p><p>Hebbian stimulation, based on principles of spike timing-dependent plasticity (STDP), has been successfully used to enhance functional recovery in individuals with spinal cord injury (SCI). To advance therapies using Hebbian stimulation, this study aimed to establish STDP-based protocols targeting spinal motoneuron synapses in awake rats. Adult male and female Sprague Dawley rats were implanted with stainless steel screws through the skull over the hindlimb area of the left motor cortex to enable epidural cortical stimulation. A custom-made cuff with embedded fine-wire electrodes was placed around the right posterior tibial nerve for peripheral stimulation. Fine-wire electrodes were inserted in the soleus muscle to record motor-evoked potentials (MEPs), H-reflexes, and the maximal motor response. During Hebbian stimulation, descending volleys evoked by cortical stimulation were timed to reach spinal motoneurons either 2.5 ms before (Hebbian+) or 15 ms after (Hebbian-) the arrival of antidromic potentials evoked by tibial nerve stimulation on different days. Rats received 180 paired pulses over 30 minutes, with measurements taken at baseline and every 10 minutes up to 40 minutes post-stimulation. We found that MEP size increased by an average of 30% over baseline during the 40-minute post-stimulation period with Hebbian+ stimulation and decreased by an average of 27% with Hebbian- stimulation. These findings provide the first evidence that paired stimulation based on Hebbian STDP principles can bidirectionally modulate MEPs in awake rats. Our rat model of Hebbian stimulation paves the way for exploring experimental combination therapies to enhance motor recovery following SCI and other neurological disorders.</p>","PeriodicalId":16563,"journal":{"name":"Journal of neurophysiology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145069848","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}
引用次数: 0
The Effects of Hip Abductor Fatigue on Gait Instability in Older Adults. 髋关节外展肌疲劳对老年人步态不稳定的影响。
IF 2.1 3区 医学
Journal of neurophysiology Pub Date : 2025-09-12 DOI: 10.1152/jn.00465.2024
Andrew D Shelton, Vicki S Mercer, Katherine R Saul, Kinh Truong, Jason R Franz
{"title":"The Effects of Hip Abductor Fatigue on Gait Instability in Older Adults.","authors":"Andrew D Shelton, Vicki S Mercer, Katherine R Saul, Kinh Truong, Jason R Franz","doi":"10.1152/jn.00465.2024","DOIUrl":"https://doi.org/10.1152/jn.00465.2024","url":null,"abstract":"<p><p>Fatigue is a critical factor governing muscle force responsiveness and, thereby, capacity to respond to balance challenges. Mediolateral stability is crucial for older adults to safely navigate their daily environments and disproportionally requires active control; the hip abductors are the key muscles in regulating lateral foot placement and mediolateral stability. Our study aimed to characterize the effects of hip abductor fatigue on gait instability in a cohort of older adults. We hypothesized that fatigue, as induced by continuous lateral stepping, would compromise mediolateral walking balance control - evidenced by larger vulnerability to lateral waist-pull perturbations and decreased speed and accuracy when responding to prescribed changes in lateral foot placement. Here, we use the term vulnerability to signify some change in a specific balance outcome in response to a perturbation. Musculoskeletal modeling informed the magnitude of fatigue that compromises balance recovery and the ways in which other leg muscles compensate. Continuous lateral stepping induced significant hip abductor fatigue; on average, gluteus medius EMG median frequency decreased by 16%, and, as measured after the balance challenge, maximum isometric force decreased by 9%. Fatigue significantly affected vulnerability to lateral waist-pull perturbations and elicited 14% larger lateral displacement, requiring 11% larger margins of stability during recovery. Conversely, performance on the lateral foot placement task was unaffected by fatigue. When modeling hip abductor fatigue more generally, our simulations of lateral balance recovery strides could accommodate, on average, up to 55% hip abductor fatigue. This study draws a mechanistic link between hip abductor fatigue and its compromising effect when called upon to preserve stability. These findings point to the importance of preventative exercises in reducing fatigability and preserving the ability to maintain balance.</p>","PeriodicalId":16563,"journal":{"name":"Journal of neurophysiology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145054000","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}
引用次数: 0
Changes in pH and myelin-related proteins expression in neonatal pigs post-hypoxic-ischemic injury. 缺氧缺血性损伤后新生猪pH和髓磷脂相关蛋白表达的变化。
IF 2.1 3区 医学
Journal of neurophysiology Pub Date : 2025-09-10 DOI: 10.1152/jn.00099.2025
Qin Zhang, Si-Jia Zhao, Ke-Xin Li, Yang Zheng
{"title":"Changes in pH and myelin-related proteins expression in neonatal pigs post-hypoxic-ischemic injury.","authors":"Qin Zhang, Si-Jia Zhao, Ke-Xin Li, Yang Zheng","doi":"10.1152/jn.00099.2025","DOIUrl":"https://doi.org/10.1152/jn.00099.2025","url":null,"abstract":"<p><p>Neonatal hypoxic-ischemic encephalopathy (HIE) is a significant cause of developmental disorders and permanent central nervous system damage, with functional recovery closely linked to myelin sheath integrity. This study aimed to analyze the expression of pH and the voltage-gated proton channel (Hv1) in the brains of neonatal pigs with HIE at various time points, alongside changes in myelin-related proteins. MRI was employed to localize the basal ganglia and assess pH changes post-hypoxia-ischemia, while immunofluorescence staining was used to evaluate Hv1, myelin basic protein (MBP), myelin oligodendrocyte glycoprotein (MOG), and myelin-associated glycoprotein (MAG). Results indicated a correlation between pH and the expression of Hv1, MBP, and MOG. Under hypoxic-ischemic conditions, pH levels decreased, Hv1 expression increased, and myelin-associated proteins decreased. Over time, Hv1 expression declined while myelin-related protein expression increased with pH recovery. These findings suggest that following hypoxia-ischemia, extracellular acidosis can drive NOX2 through Hv1 channel, and then cause damage to white matter, and as pH gradually recovers, the damaged myelin begins to repair., offering insights into the pathological mechanisms and potential treatment strategies for HIE in newborn pigs.</p>","PeriodicalId":16563,"journal":{"name":"Journal of neurophysiology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145033546","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}
引用次数: 0
Expectation effects on repetition suppression in nociception. 期望对伤害感受中重复抑制的影响。
IF 2.1 3区 医学
Journal of neurophysiology Pub Date : 2025-09-10 DOI: 10.1152/jn.00359.2025
Lisa-Marie G Pohle, Moritz M Nickel, Birgit Nierula, Markus Ploner, Ulrike Horn, Falk Eippert
{"title":"Expectation effects on repetition suppression in nociception.","authors":"Lisa-Marie G Pohle, Moritz M Nickel, Birgit Nierula, Markus Ploner, Ulrike Horn, Falk Eippert","doi":"10.1152/jn.00359.2025","DOIUrl":"10.1152/jn.00359.2025","url":null,"abstract":"<p><p>Repetition suppression, the reduced neural response upon repeated presentation of a stimulus, can be explained by models focussing on bottom-up (i.e. adaptation) or top-down (i.e. expectation) mechanisms. Predictive coding models fall into the latter category and propose that repetitions are expected and therefore elicit smaller prediction error responses. While studies in the visual and auditory domain provide some support for such models, in nociception evidence remains inconclusive, despite the substantial influence expectations exert on pain perception. To assess expectation effects on repetition suppression in nociception, we developed a paradigm in which healthy volunteers received brief CO<sub>2</sub> laser stimuli, while we acquired electroencephalographic (EEG) and peripheral physiological data. Importantly, laser stimuli could be either repeated after one second or not be repeated, with the probability of repetitions manipulated in a block-wise fashion, such that repetitions were either expected or unexpected. We observed repetition suppression in laser-evoked potentials as well as laser-induced gamma band oscillations, but not in laser-induced desynchronisations in the alpha and beta band. Critically, neither these EEG responses, nor the peripheral physiological data showed significant differences between the expectation conditions, with Bayesian analyses mostly providing evidence for an absence of effects. This indicates that repetition suppression to brief nociceptive laser stimuli is not driven by top-down factors, but rather mediated by other adaptation processes. While this does not preclude an influence of predictive coding models in nociception, it suggests that when the nervous system receives highly precise input, its responses are less susceptible to influence from expectations.</p>","PeriodicalId":16563,"journal":{"name":"Journal of neurophysiology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7618183/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145033580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Association between correlated effective neural drive and electromechanical fluctuations during co-contraction: Insights from MU discharges and interference EMG. 联合收缩过程中相关有效神经驱动与机电波动的关联:来自MU放电和干扰肌电图的见解。
IF 2.1 3区 医学
Journal of neurophysiology Pub Date : 2025-09-09 DOI: 10.1152/jn.00598.2024
Moeka Samoto, Minoru Shinohara, Kohei Watanabe, Yasuhide Yoshitake
{"title":"Association between correlated effective neural drive and electromechanical fluctuations during co-contraction: Insights from MU discharges and interference EMG.","authors":"Moeka Samoto, Minoru Shinohara, Kohei Watanabe, Yasuhide Yoshitake","doi":"10.1152/jn.00598.2024","DOIUrl":"https://doi.org/10.1152/jn.00598.2024","url":null,"abstract":"<p><p>This study investigated the correlation between the strength of correlated effective neural drive (END) to the antagonistic muscles and the fluctuations in neural/electrical and mechanical output around the joint during steady co-contraction, and whether the correlated END strength estimated from conventional surface EMG is correlated with that determined from motor unit (MU) discharges. Fourteen young male participants performed isometric steady co-contractions with their medial gastrocnemius and tibialis anterior muscles at 10% of maximal EMG while sitting. Correlated END strength was quantified as the maximum value of the cross-correlation function between the conventional surface EMG signals and between MU discharges decomposed from high-density surface EMG of each muscle. Correlated END strength quantified from each signal was both negatively correlated with the fluctuations in net force (MU-based: r = -0.78; EMG-based: r = -0.63, <i>P</i> < 0.025) but positively correlated with the fluctuations in the corresponding neural/electrical signal (MU-based: r = 0.54; EMG-based: r = 0.73, <i>P</i> < 0.05). Additionally, the fluctuations in MU discharge frequency was negatively correlated with the fluctuations in net ankle extension-flexion force recorded as the mechanical output (r = -0.57, <i>P</i> < 0.05). Furthermore, correlated END strength was highly correlated between the MU-based and EMG-estimated measures (r = 0.83, <i>P</i> < 0.05). These results suggest that individuals with a greater correlated END to the antagonistic muscles exhibit greater neural/electrical fluctuations yet steadier mechanical output at the joint level during co-contraction, and the strength of correlated END can be observed in conventional surface EMG in such conditions.</p>","PeriodicalId":16563,"journal":{"name":"Journal of neurophysiology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145029991","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}
引用次数: 0
Distinct Roles of Alpha and Theta Oscillations in Information-Seeking in Cognitive Control. α和θ振荡在认知控制信息寻求中的独特作用。
IF 2.1 3区 医学
Journal of neurophysiology Pub Date : 2025-09-09 DOI: 10.1152/jn.00205.2025
Seema Prasad, Christian Beste
{"title":"Distinct Roles of Alpha and Theta Oscillations in Information-Seeking in Cognitive Control.","authors":"Seema Prasad, Christian Beste","doi":"10.1152/jn.00205.2025","DOIUrl":"https://doi.org/10.1152/jn.00205.2025","url":null,"abstract":"<p><p>Cognitive control - the ability to regulate information processing in line with current goals - is essential for cognitive functioning. We examined whether uncertainty in cognitive control demands leads to higher processing of cues that reduce uncertainty. Participants completed a Go/NoGo task with two NoGo:Go ratios (4:5 and 1:6). Colored cues, either predictive (80%) or unpredictive (50%), preceded targets. Neurophysiological data were analyzed using time-frequency, beamforming, and aperiodic activity approaches. The behavioral results showed an effect of the cues only in the high uncertain (4:5), predictive cues (80%) condition indicating that uncertainty in the demands of response inhibition makes people susceptible to external cues that can help resolve this uncertainty. Strong alpha band activity in the posterior cingulate cortex following cue onset in the 50% 4:5 condition suggested that alpha band activity plays a significant role in the suppression of cues irrelevant to the current task. We also observed significant theta band activity following target onset in the 80% condition suggesting that only reliable cues influenced response selection. Aperiodic components showed no effects. These findings have implications towards understanding the relationship between information-seeking and uncertainty in the context of cognitive control and the role of periodic and aperiodic neural activity.</p>","PeriodicalId":16563,"journal":{"name":"Journal of neurophysiology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145029980","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}
引用次数: 0
What makes the human brain special - from cellular function to clinical translation. 人类大脑的特殊之处——从细胞功能到临床翻译。
IF 2.1 3区 医学
Journal of neurophysiology Pub Date : 2025-09-05 DOI: 10.1152/jn.00120.2025
Karen M J van Loo, Aniella Bak, Rebecca Hodge, Francesco Bedogni, Julian S B Ramirez, Samuel N Emerson, Anke Höllig, Huibert D Mansvelder, Natalia A Goriounova, Jan-Marino Ramirez, Henner Koch
{"title":"What makes the human brain special - from cellular function to clinical translation.","authors":"Karen M J van Loo, Aniella Bak, Rebecca Hodge, Francesco Bedogni, Julian S B Ramirez, Samuel N Emerson, Anke Höllig, Huibert D Mansvelder, Natalia A Goriounova, Jan-Marino Ramirez, Henner Koch","doi":"10.1152/jn.00120.2025","DOIUrl":"https://doi.org/10.1152/jn.00120.2025","url":null,"abstract":"<p><p>What makes the human brain special? Human neurons, glia cells, and cortical circuits have been shown to be significantly different from those of other species, including mammals. This has led to a massive effort by the neuroscience community to directly study these differences in a multimodal approach. The studies conducted include single-cell and network recordings of human tissue samples, single-cell transcriptomics, and morphological analysis of the distinct cells to better understand the underlying differences from the cellular to the systems level. Furthermore, to overcome the translational gap from animal studies to patient care, the development of disease modeling in human tissue samples is of utmost interest. Here we review and highlight research that focuses on the specialization of the human brain from molecular expression, cellular properties to the challenges and promises of clinical translation.</p>","PeriodicalId":16563,"journal":{"name":"Journal of neurophysiology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145006226","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}
引用次数: 0
Complexity of neural outputs elicited by transcranial magnetic stimulation. 经颅磁刺激引起的神经输出的复杂性。
IF 2.1 3区 医学
Journal of neurophysiology Pub Date : 2025-09-04 DOI: 10.1152/jn.00221.2025
Takuya Morishita, Sylvain Harquel, Pablo Maceira-Elvira, Philip Egger, Friedhelm Christoph Hummel
{"title":"Complexity of neural outputs elicited by transcranial magnetic stimulation.","authors":"Takuya Morishita, Sylvain Harquel, Pablo Maceira-Elvira, Philip Egger, Friedhelm Christoph Hummel","doi":"10.1152/jn.00221.2025","DOIUrl":"https://doi.org/10.1152/jn.00221.2025","url":null,"abstract":"<p><p>Complex neural activity of the motor cortex is posited to serve as the foundation for a large repertoire of activation patterns crucial for executing movements. As transcranial magnetic stimulation (TMS) predominantly activates monosynaptic fast-conducting corticospinal projections, which are involved in dexterous movement control, complexity of neural outputs elicited by TMS may reflect an underlying repertoire of activation patterns crucial for executing dexterous movements. We proposed to quantify dimensionality of multi-muscle motor-evoked potentials (MEPs) through dimensionality reduction as an integrated measure to reflect complexity of neural outputs elicited by TMS. For its validation, we conducted two experiments focusing on different stimulus parameters: stimulus intensity (experiment 1: <i>n</i> = 40) and size of motor mapping (experiment 2: <i>n</i> = 35). The present findings demonstrated that lower intensities resulted in higher complexity and vice versa but no effects of different sizes of motor mapping on complexity. Analyses incorporating disparities in MEP amplitude across different muscles supported that complexity was effectively captured through dimensionality reduction. Notably, complexity was minimally influenced by the selection of muscles and was associated with individual differences in motor cortex anatomy. We performed two fingers alternating tapping as one index of dexterous movements, and results demonstrated its association with complexity of neural outputs elicited by TMS: higher complexity corresponded to better dexterous performance. The proposed complexity measure might reflect neural processes aligned with the principle of motor abundance. The framework complements well-established MEP analyses and offers a novel perspective for investigating the motor system.</p>","PeriodicalId":16563,"journal":{"name":"Journal of neurophysiology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145000695","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}
引用次数: 0
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