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Oscillatory Activities in Multiple Frequency Bands in Patients with Schizophrenia During Motion Perception. 精神分裂症患者运动知觉过程中多频带振荡活动。
IF 2 4区 医学 Q3 CLINICAL NEUROLOGY Pub Date : 2023-07-01 DOI: 10.1177/15500594221141825
C Başar-Eroğlu, K M Küçük, L Rürup, C Schmiedt-Fehr, B Mathes

Patients with schizophrenia show impairment in binding stimulus features into coherent objects, which are reflected in disturbed oscillatory activities. This study aimed to identify disturbances in multiple oscillatory bands during perceptual organization of motion perception in patients with schizophrenia. EEG was recorded from healthy controls and patients with schizophrenia during continuous presentation of a motion stimulus which induces reversals between two exogenously generated perceptions. This stimulus was used to investigate differences in motion binding processes between healthy controls and patients with schizophrenia. EEG signals were transformed into frequency components by means of the Morlet wavelet transformation in order to analyse inter-trial coherences (ITC) in the delta (1-4 Hz), theta (4-7 Hz), alpha (8-12 Hz), and gamma (28-48 Hz) frequency bands during exogenous motion binding. Patients showed decreased delta-ITC in occipital and theta-ITC in central and parietal areas, while no significant differences were found for neither alpha nor gamma-ITCs. The present study provides one of the first insights on the oscillatory synchronizations related with the motion perception in schizophrenia. The ITC differences revealed alterations in the consistency of large-scale integration and transfer functions in patients with schizophrenia.

精神分裂症患者在将刺激特征与连贯的物体结合方面表现出障碍,这反映在振荡活动的干扰上。本研究旨在确定精神分裂症患者运动知觉知觉组织过程中多个振荡带的干扰。在连续呈现运动刺激时,记录健康对照和精神分裂症患者的脑电图,该运动刺激诱导两种外源性感知之间的逆转。这种刺激被用来研究健康对照者和精神分裂症患者之间运动结合过程的差异。利用Morlet小波变换将脑电信号转换成频率分量,分析外源运动绑定过程中delta (1 ~ 4hz)、theta (4 ~ 7hz)、alpha (8 ~ 12hz)和gamma (28 ~ 48hz)频段的试验间相干性(ITC)。患者枕区δ itc和中央区和顶叶区θ itc均下降,而α itc和γ itc均无显著差异。本研究首次揭示了与精神分裂症运动知觉相关的振荡同步现象。ITC差异揭示了精神分裂症患者大规模整合和传递功能一致性的改变。
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引用次数: 0
Mental Activity as the Bridge between Neural Biomarkers and Symptoms of Psychiatric Illness. 心理活动是神经生物标志物与精神疾病症状之间的桥梁。
IF 2 4区 医学 Q3 CLINICAL NEUROLOGY Pub Date : 2023-07-01 DOI: 10.1177/15500594221112417
Justin Riddle, Flavio Frohlich

The Research Domain Criteria (RDoC) initiative challenges researchers to build neurobehavioral models of psychiatric illness with the hope that such models identify better targets that will yield more effective treatment. However, a guide for building such models was not provided and symptom heterogeneity within Diagnostic Statistical Manual categories has hampered progress in identifying endophenotypes that underlie mental illness. We propose that the best chance to discover viable biomarkers and treatment targets for psychiatric illness is to investigate a triangle of relationships: severity of a specific psychiatric symptom that correlates to mental activity that correlates to a neural activity signature. We propose that this is the minimal model complexity required to advance the field of psychiatry. With an understanding of how neural activity relates to the experience of the patient, a genuine understanding for how treatment imparts its therapeutic effect is possible. After the discovery of this three-fold relationship, causal testing is required in which the neural activity pattern is directly enhanced or suppressed to provide causal, instead of just correlational, evidence for the biomarker. We suggest using non-invasive brain stimulation (NIBS) as these techniques provide tools to precisely manipulate spatial and temporal activity patterns. We detail how this approach enabled the discovery of two orthogonal electroencephalography (EEG) activity patterns associated with anhedonia and anxiosomatic symptoms in depression that can serve as future treatment targets. Altogether, we propose a systematic approach for building neurobehavioral models for dimensional psychiatry.

研究领域标准(RDoC)倡议要求研究人员建立精神疾病的神经行为模型,希望这些模型能够识别出更好的目标,从而产生更有效的治疗方法。然而,没有提供建立这种模型的指南,而且《诊断统计手册》类别中的症状异质性阻碍了识别精神疾病基础的内表型的进展。我们建议,发现精神疾病可行的生物标志物和治疗目标的最佳机会是调查一个三角关系:特定精神症状的严重程度与精神活动相关,而精神活动又与神经活动特征相关。我们认为,这是推进精神病学领域所需的最小模型复杂性。了解了神经活动与患者体验的关系,就有可能真正了解治疗是如何产生治疗效果的。在发现这种三重关系之后,需要进行因果测试,其中神经活动模式直接增强或抑制,以提供生物标志物的因果证据,而不仅仅是相关证据。我们建议使用非侵入性脑刺激(NIBS),因为这些技术提供了精确操纵空间和时间活动模式的工具。我们详细介绍了这种方法如何发现与抑郁症中的快感缺乏和焦虑躯体症状相关的两种正交脑电图(EEG)活动模式,这些活动模式可以作为未来的治疗目标。总之,我们提出了一种系统的方法来建立维度精神病学的神经行为模型。
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引用次数: 0
Temporal and Spectral Properties of the Auditory Mismatch Negativity and P3a Responses in Schizophrenia. 精神分裂症患者听觉错配负性和P3a反应的时间和频谱特性
IF 2 4区 医学 Q3 CLINICAL NEUROLOGY Pub Date : 2023-07-01 DOI: 10.1177/15500594221089367
Nancy B Lundin, Leah P Burroughs, Paul D Kieffaber, Jaime J Morales, Brian F O'Donnell, William P Hetrick

The mismatch negativity (MMN) event-related potential (ERP) indexes relatively automatic detection of changes in sensory stimuli and is typically attenuated in individuals with schizophrenia. However, contributions of different frequencies of electroencephalographic (EEG) activity to the MMN and the later P3a attentional orienting response in schizophrenia are poorly understood and were the focus of the present study. Participants with a schizophrenia-spectrum disorder (n = 85) and non-psychiatric control participants (n = 74) completed a passive auditory oddball task containing 10% 50 ms "deviant" tones and 90% 100 ms "standard" tones. EEG data were analyzed using spatial principal component analysis (PCA) applied to wavelet-based time-frequency analysis and MMN and P3a ERPs. The schizophrenia group compared to the control group had smaller MMN amplitudes and lower deviant-minus-standard theta but not alpha event-related spectral perturbation (ERSP) after accounting for participant age and sex. Larger MMN and P3a amplitudes but not latencies were correlated with greater theta and alpha time-frequency activity. Multiple linear regression analyses revealed that control participants showed robust relationships between larger MMN amplitudes and greater deviant-minus-standard theta inter-trial coherence (ITC) and between larger P3a amplitudes and greater deviant-minus-standard theta ERSP, whereas these dynamic neural processes were less tightly coupled in participants with a schizophrenia-spectrum disorder. Study results help clarify frequency-based contributions of time-domain (ie, ERP) responses and indicate a potential disturbance in the neural dynamics of detecting change in sensory stimuli in schizophrenia. Overall, findings add to the growing body of evidence that psychotic illness is associated with widespread neural dysfunction in the theta frequency band.

失配负性(MMN)事件相关电位(ERP)指标相对自动检测感觉刺激的变化,并且在精神分裂症个体中通常减弱。然而,不同频率的脑电图(EEG)活动对精神分裂症患者MMN和后期P3a注意定向反应的贡献知之甚少,这是本研究的重点。有精神分裂症谱系障碍的参与者(n = 85)和没有精神疾病的对照组参与者(n = 74)完成了一项被动听觉古怪任务,其中包含10%的50毫秒“异常”音调和90%的100毫秒“标准”音调。采用空间主成分分析(PCA)、小波时频分析、MMN和P3a erp对脑电数据进行分析。考虑到参与者的年龄和性别,与对照组相比,精神分裂症组的MMN振幅较小,偏离-负标准theta较低,但α事件相关谱摄动(ERSP)较低。更大的MMN和P3a振幅而非潜伏期与更大的θ和α时频活动相关。多元线性回归分析显示,对照组受试者的MMN波幅值越大,试验间相干性越强,P3a波幅值越大,试验间相干性越强,而精神分裂症谱系障碍受试者的动态神经过程耦合程度越低。研究结果有助于澄清基于频率的时域(即ERP)反应的贡献,并表明在精神分裂症中检测感觉刺激变化的神经动力学中存在潜在的干扰。总的来说,这些发现增加了越来越多的证据,证明精神疾病与θ波段广泛的神经功能障碍有关。
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引用次数: 1
Phase Delay of the 40 Hz Auditory Steady-State Response Localizes to Left Auditory Cortex in Schizophrenia. 40赫兹听觉稳态反应的相位延迟在精神分裂症患者左侧听皮层定位
IF 1.6 4区 医学 Q3 CLINICAL NEUROLOGY Pub Date : 2023-07-01 Epub Date: 2022-10-10 DOI: 10.1177/15500594221130896
Brian J Roach, Yoji Hirano, Judith M Ford, Kevin M Spencer, Daniel H Mathalon

Background. The auditory steady state response (ASSR) is generated in bilateral auditory cortex and is the most used electroencephalographic (EEG) or magnetoencephalographic measure of gamma band abnormalities in schizophrenia. While the finding of reduced 40-Hz ASSR power and phase consistency in schizophrenia have been replicated many times, the 40-Hz ASSR phase locking angle (PLA), which assesses oscillation latency or phase delay, has rarely been examined. Furthermore, whether 40-Hz ASSR phase delay in schizophrenia is lateralized or common to left and right auditory cortical generators is unknown. Methods. Previously analyzed EEG data recorded from 24 schizophrenia patients and 24 healthy controls presented with 20-, 30-, and 40-Hz click trains to elicit ASSRs were re-analyzed to assess PLA in source space. Dipole moments in the right and left hemisphere were used to assess both frequency and hemisphere specificity of ASSR phase delay in schizophrenia. Results. Schizophrenia patients exhibited significantly reduced (ie, phase delayed) 40-Hz PLA in the left, but not the right, hemisphere, but their 20- and 30-Hz PLA values were normal. This left-lateralized 40-Hz phase delay was unrelated to symptoms or to previously reported left-lateralized PLF reductions in the schizophrenia patients. Conclusions. Consistent with sensor-based studies, the 40-Hz ASSR source-localized to left, but not right, auditory cortex was phase delayed in schizophrenia. Consistent with prior studies showing left temporal lobe volume deficits in schizophrenia, our findings suggest sluggish entrainment to 40-Hz auditory stimulation specific to left auditory cortex that are distinct from well-established deficits in gamma ASSR power and phase synchrony.

背景。听觉稳态反应(ASSR)产生于双侧听觉皮层,是精神分裂症患者伽马波段异常最常用的脑电图(EEG)或脑磁图测量指标。虽然精神分裂症患者的 40-Hz ASSR 功率和相位一致性降低的发现已被多次证实,但评估振荡潜伏期或相位延迟的 40-Hz ASSR 锁相角(PLA)却很少被研究。此外,精神分裂症患者的 40-Hz ASSR 相位延迟是侧向的还是左右听觉皮层发生器共同的,目前尚不清楚。研究方法对之前分析的 24 名精神分裂症患者和 24 名健康对照者的脑电图数据进行重新分析,以评估源空间的 PLA。使用左右半球的偶极矩来评估精神分裂症患者 ASSR 相位延迟的频率和半球特异性。结果显示精神分裂症患者的左半球(而非右半球)40 Hz PLA 值明显降低(即相位延迟),但其 20 Hz 和 30 Hz PLA 值正常。这种左侧化的 40 赫兹相位延迟与精神分裂症患者的症状或之前报道的左侧化 PLF 降低无关。结论与基于传感器的研究一致,精神分裂症患者听觉皮层左侧而非右侧的40 Hz ASSR源定位存在相位延迟。我们的研究结果表明,精神分裂症患者左侧颞叶容积不足,这与之前的研究结果一致,表明左侧听觉皮层对40Hz听觉刺激的特异性伴音迟缓,有别于伽马ASSR功率和相位同步性的公认缺陷。
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引用次数: 0
The Relationship Between Cannabinoids and Neural Oscillations: How Cannabis Disrupts Sensation, Perception, and Cognition. 大麻素和神经振荡之间的关系:大麻如何扰乱感觉,知觉和认知。
IF 2 4区 医学 Q3 CLINICAL NEUROLOGY Pub Date : 2023-07-01 DOI: 10.1177/15500594221138280
Shariful A Syed, Ashley M Schnakenberg Martin, Jose A Cortes-Briones, Patrick D Skosnik

Disruptions in neural oscillations are believed to be one critical mechanism by which cannabinoids, such as delta-9-tetrahyrdrocannabinol (THC; the primary psychoactive constituent of cannabis), perturbs brain function. Here we briefly review the role of synchronized neural activity, particularly in the gamma (30-80 Hz) and theta (4-7 Hz) frequency range, in sensation, perception, and cognition. This is followed by a review of clinical studies utilizing electroencephalography (EEG) which have demonstrated that both chronic and acute cannabinoid exposure disrupts neural oscillations in humans. We also offer a hypothetical framework through which endocannabinoids modulate neural synchrony at the network level. This also includes speculation on how both chronic and acute cannabinoids disrupt functionally relevant neural oscillations by altering the fine tuning of oscillations and the inhibitory/excitatory balance of neural circuits. Finally, we highlight important clinical implications of such oscillatory disruptions, such as the potential relationship between cannabis use, altered neural synchrony, and disruptions in sensation, perception, and cognition, which are perturbed in disorders such as schizophrenia.

神经振荡的中断被认为是大麻素,如δ -9-四氢大麻酚(THC;(大麻的主要精神活性成分),扰乱大脑功能。在这里,我们简要回顾同步神经活动的作用,特别是在伽马(30-80赫兹)和θ(4-7赫兹)频率范围内,在感觉,感知和认知。随后是利用脑电图(EEG)临床研究的回顾,这些研究表明,慢性和急性大麻素暴露都会破坏人类的神经振荡。我们还提供了一个假设的框架,通过该框架内源性大麻素在网络水平上调节神经同步。这也包括关于慢性和急性大麻素如何通过改变振荡的微调和神经回路的抑制/兴奋平衡来破坏功能相关的神经振荡的猜测。最后,我们强调了这种振荡中断的重要临床意义,例如大麻使用、改变的神经同步性和感觉、感知和认知中断之间的潜在关系,这些在精神分裂症等疾病中受到干扰。
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引用次数: 1
Special Issue: Update on Neural Oscillations in Neuropsychiatric Disorders. 特刊:神经精神疾病中神经振荡的最新进展。
IF 2 4区 医学 Q3 CLINICAL NEUROLOGY Pub Date : 2023-07-01 DOI: 10.1177/15500594231181523
Bahar Güntekin, Brian F O'Donnell
The present issue highlights recent progress in the analysis of oscillatory activity for the assessment, understanding and remediation of psychiatric and neurologic disorders. Contemporary interest in neural synchrony and oscillations in neuropsychiatric disorders has been motivated by investigations of cellular and network oscillations, modeling of neural networks and advances in signal analysis. Hebb proposed that synchronous activation between two neurons strengthened connectivity between them; and that a reverberatory neural circuit could maintain a representation of a stimulus in memory. More recent findings implicate neural synchrony and oscillations in feature binding, attentional selection, arousal, memory operations and consciousness. Consequently, disturbances of oscillations within and between neural ensembles may contribute to sensory, behavioral and cognitive deficits in neuropsychiatric disorders. Because human EEG and MEG activity are generated by synchronized inhibitory and excitatory postsynaptic potentials within large ensembles of neurons, they are well suited for the detection of neural synchrony and oscillations with millisecond temporal resolution. In the present issue, investigators describe alterations of spontaneous or evoked oscillatory activity in a wide range of conditions, including Parkinson’s disease (Bayraktaroglu et al, 2023), Alzheimer’s disease (Fide et al, 2023), neurodegenerative disorders (Keller et al, 2023) depression (Riddle et al, 2023), schizophrenia (Basar Eroglu et al, 2023; Lundin et al, 2023; Peterson et al, 2023; Roach et al, 2023) and cannabis use disorders (Syed et al, 2023). These studies are broadly consistent with the hypothesis that disorders that affect signaling or connectivity among neurons will be associated with aberrant oscillatory activity. Moreover, these data indicate the potential of oscillatory measures for probing neuropathological mechanisms, identifying biomarkers, tracking course and predicting outcomes. Advances in signal analysis have been critical for the characterization of oscillatory activity in neuropsychiatric populations. At a single channel, time frequency analysis yields measures of frequency, amplitude and phase. Time-frequency analysis allows the assessment of the temporal dynamics of event-related oscillations before and after an event of interest (Delorme and Makeig, 2004; Keil et al, 2022). The papers in this issue draw on a rich array of methods, including resting power spectrum, event-related phase locking, phase delay, event-related power spectrum, coherence, and resting or event-related cross-frequency coupling. Lundin et al (2023) investigated the event-related power spectrum in patients with schizophrenia and Fide et al (2023) examined patients with Alzheimer’s disease patients. Event-related phase locking, also termed inter-trial coherence, is a measure of phase consistency across trials relative to a time locking event for a specific frequency band. In th
{"title":"Special Issue: Update on Neural Oscillations in Neuropsychiatric Disorders.","authors":"Bahar Güntekin,&nbsp;Brian F O'Donnell","doi":"10.1177/15500594231181523","DOIUrl":"https://doi.org/10.1177/15500594231181523","url":null,"abstract":"The present issue highlights recent progress in the analysis of oscillatory activity for the assessment, understanding and remediation of psychiatric and neurologic disorders. Contemporary interest in neural synchrony and oscillations in neuropsychiatric disorders has been motivated by investigations of cellular and network oscillations, modeling of neural networks and advances in signal analysis. Hebb proposed that synchronous activation between two neurons strengthened connectivity between them; and that a reverberatory neural circuit could maintain a representation of a stimulus in memory. More recent findings implicate neural synchrony and oscillations in feature binding, attentional selection, arousal, memory operations and consciousness. Consequently, disturbances of oscillations within and between neural ensembles may contribute to sensory, behavioral and cognitive deficits in neuropsychiatric disorders. Because human EEG and MEG activity are generated by synchronized inhibitory and excitatory postsynaptic potentials within large ensembles of neurons, they are well suited for the detection of neural synchrony and oscillations with millisecond temporal resolution. In the present issue, investigators describe alterations of spontaneous or evoked oscillatory activity in a wide range of conditions, including Parkinson’s disease (Bayraktaroglu et al, 2023), Alzheimer’s disease (Fide et al, 2023), neurodegenerative disorders (Keller et al, 2023) depression (Riddle et al, 2023), schizophrenia (Basar Eroglu et al, 2023; Lundin et al, 2023; Peterson et al, 2023; Roach et al, 2023) and cannabis use disorders (Syed et al, 2023). These studies are broadly consistent with the hypothesis that disorders that affect signaling or connectivity among neurons will be associated with aberrant oscillatory activity. Moreover, these data indicate the potential of oscillatory measures for probing neuropathological mechanisms, identifying biomarkers, tracking course and predicting outcomes. Advances in signal analysis have been critical for the characterization of oscillatory activity in neuropsychiatric populations. At a single channel, time frequency analysis yields measures of frequency, amplitude and phase. Time-frequency analysis allows the assessment of the temporal dynamics of event-related oscillations before and after an event of interest (Delorme and Makeig, 2004; Keil et al, 2022). The papers in this issue draw on a rich array of methods, including resting power spectrum, event-related phase locking, phase delay, event-related power spectrum, coherence, and resting or event-related cross-frequency coupling. Lundin et al (2023) investigated the event-related power spectrum in patients with schizophrenia and Fide et al (2023) examined patients with Alzheimer’s disease patients. Event-related phase locking, also termed inter-trial coherence, is a measure of phase consistency across trials relative to a time locking event for a specific frequency band. In th","PeriodicalId":10682,"journal":{"name":"Clinical EEG and Neuroscience","volume":"54 4","pages":"347-348"},"PeriodicalIF":2.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9696319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Transcranial Alternating Current Stimulation Alters Auditory Steady-State Oscillatory Rhythms and Their Cross-Frequency Couplings. 经颅交流电刺激改变听觉稳态振荡节律及其交叉频率耦合。
IF 2 4区 医学 Q3 CLINICAL NEUROLOGY Pub Date : 2023-06-12 DOI: 10.2139/ssrn.4081702
S. de la Salle, J. Choueiry, Mark Payumo, Matt Devlin, Chelsea Noel, A. Abozmal, M. Hyde, Renée Baysarowich, B. Duncan, V. Knott
Auditory cortical plasticity deficits in schizophrenia are evidenced with electroencephalographic (EEG)-derived biomarkers, including the 40-Hz auditory steady-state response (ASSR). Aiming to understand the underlying oscillatory mechanisms contributing to the 40-Hz ASSR, we examined its response to transcranial alternating current stimulation (tACS) applied bilaterally to the temporal lobe of 23 healthy participants. Although not responding to gamma tACS, the 40-Hz ASSR was modulated by theta tACS (vs sham tACS), with reductions in gamma power and phase locking being accompanied by increases in theta-gamma phase-amplitude cross-frequency coupling. Results reveal that oscillatory changes induced by frequency-tuned tACS may be one approach for targeting and modulating auditory plasticity in normal and diseased brains.
精神分裂症的听觉皮层可塑性缺陷可以通过脑电图(EEG)衍生的生物标志物来证明,包括40Hz听觉稳态反应(ASSR)。为了了解40 Hz ASSR的潜在振荡机制,我们检测了23名健康参与者对双侧颞叶经颅交流刺激(tACS)的反应。尽管对伽马tACS没有响应,但40Hz ASSR由θtACS调制(与假tACS相比),伽马功率和锁相的降低伴随着θ-伽马相位振幅交叉频率耦合的增加。结果表明,调频tACS诱导的振荡变化可能是靶向和调节正常和患病大脑听觉可塑性的一种方法。
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引用次数: 0
Experimental Validation of the Cumulative MDRM in theP300 Speller Machine. p300拼字机上累积MDRM的实验验证。
IF 2 4区 医学 Q3 CLINICAL NEUROLOGY Pub Date : 2023-05-01 DOI: 10.1177/15500594221078166
Fodil Zerrouki, Salah Haddab

The P300 speller Machine is among the leading applications of the electroencephalography (EEG)-based brain computer interfaces (BCIs), it is still a benchmark and a persistent challenge for the BCI Community. EEG signal classification represents the key piece of a BCI chain. The minimum distance to Riemannian mean (MDRM) belongs to these classification methods emerging in different BCI applications such as text spelling by thought. Based on a binary classification of each covariance matrix separately, character prediction is done according to the highest score across the whole set of all repetitions. Minimum cumulative distance to Riemannian mean (MCDRM) is a Cumulative variant of the MDRM, perfectly adapted to the P300 Speller Machine. The power of this variant is that prediction takes a more global proceeding involving the n repetitions together. Indeed, thanks to cumulative distances selected row and column are those having the covariance matrices both closer to the Target barycenter and farther from the non-Target one. This variant overcomes the main MDRM limitations as it improves inter-sessional generalization, allows optimal use of all repetitions and reduces considerably the risk of conflict appearing during the selection of rows and columns leading to character prediction. We applied this variant to the raw signals of Data set II-b of Berlin BCI and compared to the published results the MCDRM offers significantly higher results: 97.5% of correct predictions compared to the 96.5% of the competition winner. The MCDRM fits best with the P300 Speller machine, especially when dealing with noisy signals that requires intelligent and optimal usage of the n repetitions.

P300拼写机是基于脑电图(EEG)的脑机接口(BCI)的主要应用之一,它仍然是脑机接口社区的基准和持续挑战。脑电信号分类是脑机接口链的关键环节。到黎曼均值的最小距离(MDRM)属于在不同脑机接口应用中出现的分类方法,如思想拼写文本。在对每个协方差矩阵分别进行二值分类的基础上,根据整个重复集的最高分进行字符预测。最小累积距离黎曼平均(MCDRM)是MDRM的累积变体,完美地适应于P300拼写机。这种变体的强大之处在于,预测需要一个涉及n个重复的更全局的过程。实际上,由于累积距离,所选择的行和列是那些协方差矩阵既靠近目标重心又远离非目标重心的行和列。这种变体克服了主要的MDRM限制,因为它提高了会话间泛化,允许优化使用所有重复,并大大降低了在选择行和列导致字符预测期间出现冲突的风险。我们将这种变体应用于柏林BCI数据集II-b的原始信号,与已发表的结果相比,MCDRM提供了明显更高的结果:97.5%的正确预测与96.5%的竞争获胜者相比。MCDRM最适合P300拼写机,特别是在处理需要智能和优化使用n次重复的噪声信号时。
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引用次数: 0
Monitoring the Awake and Anesthetized Unconscious States Using Bispectral Index and Electroencephalographic Connectivity Measures. 利用双谱指数和脑电图连通性测量监测清醒和麻醉无意识状态。
IF 2 4区 医学 Q3 CLINICAL NEUROLOGY Pub Date : 2023-05-01 DOI: 10.1177/15500594221131680
Marianne Cecilie Johansen Nævra, Luis Romundstad, Anders Aasheim, Pål Gunnar Larsson

Objective. Our objective was to compare three electroencephalography (EEG)-based methods with anesthesiologist clinical judgment of the awake and anesthetized unconscious states. Methods. EEG recorded from 25 channels and from four channel bilateral Bispectral index (BIS) electrodes were collected from 20 patients undergoing surgery with general anesthesia. To measure connectivity we applied Directed Transfer Function (DTF) in eight channels of the EEG, and extracted data from BIS over the same time segments. Shannon's entropy was applied to assess the complexity of the EEG signal. Discriminant analysis was used to evaluate the data in relation to clinical judgment. Results. Assessing anesthetic state relative clinical judgment, the bilateral BIS gave the highest accuracy (ACC) (95.4%) and lowest false positive discovery rate (FDR) (0.5%) . Equivalent DTF gave 94.5% for ACC and 2.6% for FDR. Combining all methods gave ACC = 94.9% and FDR = 1%. Generally, entropy scored lower on ACC and higher on FDR than the other methods (ACC 90.87% and FDR 4.6%). BIS showed at least a one minute delay in 18 of the 20 patients. Conclusions. Our results show that BIS and DTF both have a high ACC and low FDR. Because of time delays in BIS values, we recommend combining the two methods.

目标。我们的目的是比较三种基于脑电图(EEG)的方法与麻醉师对清醒和麻醉无意识状态的临床判断。方法。收集20例全麻手术患者25通道和4通道双侧双谱指数(BIS)电极记录的脑电图。为了测量脑电的连通性,我们在脑电的8个通道中应用了有向传递函数(DTF),并在同一时间段提取了BIS数据。利用香农熵来评估脑电信号的复杂度。采用判别分析对与临床判断相关的数据进行评价。结果。评估麻醉状态相对临床判断时,双侧BIS准确率最高(ACC)(95.4%),假阳性发现率最低(FDR)(0.5%)。ACC的等效DTF为94.5%,FDR为2.6%。综合各方法得出ACC = 94.9%, FDR = 1%。总的来说,熵在ACC上的得分较低,在FDR上的得分较高(ACC 90.87%, FDR 4.6%)。BIS显示20例患者中有18例至少延迟1分钟。结论。我们的研究结果表明,BIS和DTF都具有高ACC和低FDR。由于BIS值的时间延迟,我们建议将两种方法结合使用。
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引用次数: 0
Altered Dynamic Brain Connectivity in Individuals With Sickle Cell Disease and Chronic Pain Secondary to Hip Osteonecrosis. 镰状细胞病和髋关节骨坏死继发慢性疼痛患者动态脑连接改变
IF 2 4区 医学 Q3 CLINICAL NEUROLOGY Pub Date : 2023-05-01 DOI: 10.1177/15500594211054297
Jamille Evelyn R S Santana, Abrahão F Baptista, Rita Lucena, Tiago da S Lopes, Raphael S do Rosário, Marjorie R Xavier, André Fonseca, José Garcia V Miranda

Individuals with sickle cell disease (SCD) exhibit changes in static brain connectivity in rest. However, little known as chronic pain associated with hip osteonecrosis affects dynamic brain connectivity during rest and the motor imagery task. The aim of this study was to investigate the characteristics of the dynamic functional brain connectivity of individuals with SCD and chronic pain secondary to hip osteonecrosis. This is a cross-sectional study comparing the dynamic brain connectivity of healthy individuals (n = 18) with the dynamic brain connectivity of individuals with SCD and chronic pain (n = 22). Individuals with SCD and chronic pain were stratified into high- or low-intensity pain groups based on pain intensity at the time of assessment. Dynamic brain connectivity was assessed through electroencephalography in 3 stages, resting state with eyes closed, and during hip (painful for the SCD individuals) and hand (control, nonpainful) motor imagery. Average weight of the edges and full synchronization time (FST)-time required for 95% of the possible edges to appear over time during a given task-were evaluated. Regarding the average weight of the edges, individuals with SCD and high-intensity pain presented higher edge weight during hip motor imagery. The average weight of the edges correlated positively with pain intensity and depression symptoms. Individuals with SCD and chronic pain complete the cerebral network at rest more quickly (lower FST). Individuals with SCD and chronic pain/hip osteonecrosis have impaired dynamic brain network with shorter FST in rest network and more pronounced diffuse connectivity in individuals with high-intensity pain. The dynamic brain network evaluated by time-varying graphs and motif synchronization was able to identify differences between groups.

患有镰状细胞病(SCD)的个体在休息时表现出静态大脑连接的变化。然而,鲜为人知的是,与髋部骨坏死相关的慢性疼痛会影响休息和运动想象任务期间的动态大脑连接。本研究的目的是探讨SCD和髋关节骨坏死继发慢性疼痛患者的动态功能脑连接特征。这是一项横断面研究,比较了健康个体(n = 18)和慢性疼痛SCD患者(n = 22)的动态脑连通性。根据评估时的疼痛强度,SCD和慢性疼痛患者被分为高强度或低强度疼痛组。通过3个阶段的脑电图评估动态脑连通性,闭眼静息状态,以及髋关节(SCD个体疼痛)和手部(对照,无疼痛)运动想象。评估了边缘的平均权重和完全同步时间(FST)-在给定任务中随时间推移95%的可能边缘出现所需的时间。关于边缘的平均重量,SCD和高强度疼痛的个体在髋关节运动成像中表现出更高的边缘重量。边缘的平均权重与疼痛强度和抑郁症状呈正相关。患有SCD和慢性疼痛的个体在休息时完成大脑网络的速度更快(FST较低)。患有SCD和慢性疼痛/髋关节骨坏死的个体动态脑网络受损,静止网络FST较短,高强度疼痛个体弥漫性连接更明显。动态脑网络通过时变图和基序同步来评估,能够识别组间差异。
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引用次数: 4
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Clinical EEG and Neuroscience
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