Correlation between scalp-recorded electroencephalographic and electrocorticographic activities during ictal period

Hashiguchi, Kimiaki; Morioka, Takato; Yoshida, Fumiaki; Miyagi, Yasushi; Nagata, Shinji; Sakata, Ayumi; Sasaki, Tatsuya

doi:10.1016/j.seizure.2006.12.010

Cited by 61 publications

(67 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These non-invasive methods capture the spatial aggregation of local-field potentials (LFPs) with a temporal resolution of milliseconds (msec) (Schnitzler & Gross, 2005). While limited spatial resolution in EEG/MEG processing is generally acknowledged (Krolak-Salmon, Henaff, Vighetto, Bertrand, & Mauguiere, 2004;Tsuchiya, Kawasaki, Oya, Howard, & Adolphs, 2008), it remains uncertain whether these techniques possess significant utility in accessing deep cortical tissue such as the amygdala (Hashiguchi et al, 2007;Mikuni et al, 1997;Papadelis, Poghosyan, Fenwick, & Ioannides, 2009); hence, the benefit of employing iEEG techniques.…”

Section: Limitations Of Conventional Neuroimaging Methodsmentioning

confidence: 99%

“…The advantage of iEEG analysis endures in its superior temporal (Sato et al, 2011b) and spatial (Hashiguchi et al, 2007) resolution of !5 msec and between~.05 mme1 cm, respectively (Asano et al, 2005;Gray, Maldonado, Wilson, & McNaughton, 1995;Grover & Buchwald, 1970;Legatt, Arezzo, & Vaughan, 1980;Logothetis, 2002Logothetis, , 2003. Additionally, iEEG can record neurons within a "large anatomical field-of-view… and wide frequency bandwidth" (Tsuchiya et al, 2008, p. 2), ranging from low (e.g., delta, theta) to high (e.g., beta, gamma) frequency potentials at both the population and individual single-neuron level (Tsuchiya et al, 2008;Willenbockel, Lepore, Nguyen, Bouthillier, & Gosselin, 2012).…”

Section: Ieegmentioning

confidence: 99%

See 1 more Smart Citation

The functional profile of the human amygdala in affective processing: Insights from intracranial recordings

Murray

Brosch

Sander

2014

Cortex

View full text Add to dashboard Cite

t r a c tThe amygdala is suggested to serve as a key structure in the emotional brain, implicated in diverse affective processes. Still, the bulk of existing neuroscientific investigations of the amygdala relies on conventional neuroimaging techniques such as fMRI, which are very useful but subject to limitations. These limitations are particular to their temporal resolution, but also to their spatial precision at a very fine-grained level. Here, we review studies investigating the functional profile of the human amygdala using intracranial electroencephalography (iEEG), an invasive technique with high temporal and spatial precision. We conducted a systematic literature review of 47 iEEG studies investigating the human amygdala, and we focus on two content-related domains and one process-related domain: (1) memory formation and retrieval; (2) affective processing; and (3) latency components. This review reveals the human amygdala to engage in invariant semantic encoding and recognition of specific objects and individuals, independent of context or visuospatial attributes, and to discriminate between familiar and novel stimuli. The review highlights the amygdala's role in emotion processing witnessed in differential treatment of social-affective facial cues, differential neuronal firing to relevant novel stimuli, and habituation to familiar affective stimuli. Overall, the review suggests the amygdala plays a key role in the processing of affective relevance. Finally, this review delineates effects on amygdala neuronal activity into three time latency windows (post-stimulus onset). The early window (~50e290 msec) subsumes effects respective to exogenous stimulus-driven affective processing of faces and emotion. The intermediate window (~270e470 msec) comprises effects related to explicit attention to novel task-relevant stimuli, irrespective of sensory modality. The late window (~600e1400 msec) subsumes effects from tasks soliciting semantic associations and working memory during affective processing. We juxtapose these iEEG data with current clinical topics relevant to amygdala activation and propose avenues for future investigation of the amygdala using iEEG methods.© 2014 Elsevier Ltd. All rights reserved.* Corresponding author. Campus Biotech, CISA e University of Geneva, Case Postale 60, CH e 1211 Gen eve 20, Switzerland. E-mail address: ryan.murray@unige.ch (R.J. Murray).Available online at www.sciencedirect.com ScienceDirectJournal homepage: www.elsevier.com/locate/cortex c o r t e x 6 0 ( 2 0 1 4 ) 1 0 e3 3 http://dx

show abstract

Section: Limitations Of Conventional Neuroimaging Methodsmentioning

confidence: 99%

Section: Ieegmentioning

confidence: 99%

The functional profile of the human amygdala in affective processing: Insights from intracranial recordings

Murray

Brosch

Sander

2014

Cortex

View full text Add to dashboard Cite

show abstract

“…For this reason, it is a more sensible method for the localization of epileptic zone than surface EEG, because it is independent of amplitude variations of electrical potential and has a good spatial resolution [19][20][21] .…”

Section: Electroencefalographymentioning

confidence: 99%

Diagnostic methods for extra-temporal neocortical focal epilepsies: present and future

Leite

Otaduy²,

Silva

et al. 2010

Arq. Neuro-Psiquiatr.

View full text Add to dashboard Cite

The progress of epilepsies diagnosis has been great, but, amongst the diagnostic detailing that demand research, one of the most important is the essential lateralization and localization of epileptogenic zone, considered as the cerebral cortex region, that removed, will result in a free state of seizures. The present study aims to analyze the possible uses of proton spectroscopy for clinical and pre-surgical evaluation of focal extratemporal epilepsies, since this group presents the highest difficulty degree for lateralizing and locating epileptogenic zones. In almost all cases, a non invasive diagnosis can be performed using routine electroencephalography, videoelectroencephalography -considered as gold standard, and magnetic resonance imaging. However, when the results of these exams are contradictory, some patients need invasive techniques, as the intra-cranial video-EEG, using deep electrodes, sub-dural strip and grid, that are associated with increased diagnostic cost and risk of complications, as cerebral hemorrhages and intra-cranial infections. Proton spectroscopy appears as a possibility, given its capacity to evaluate cerebral metabolism, by N-acetyl-aspartate (NAA), creatine (Cre) and choline (Cho) concentrations, amongst other metabolites. This non invasive method may provide time reduction of this evaluation and reliable level improvement for this topographical diagnosis. Key words: extratemporal neocortical epilepsies, diagnostic methods, magnetic resonance spectroscopy, pre-surgical evaluation.Métodos diagnósticos das epilepsias focais neocorticais extratemporais: presente e futuro RESUMO Tem sido grande o progresso no diagnóstico das epilepsias, mas dentre os detalhamentos diagnósticos a exigir pesquisas, estão a lateralização e a localização precisas da zona epileptogênica, considerada como a região do córtex cerebral que, removida, irá resultar num estado livre de crises. Por meio de revisão da literatura, o objetivo deste estudo é expor e analisar os métodos diagnósticos das epilepsias neocorticais extratemporais, dadas as características que as tornam mais complexas do que as epilepsias temporais visto que estas apresentam o maior grau de dificuldade para lateralização e localização das zonas epileptogênicas. Na maior parte dos casos, o diagnóstico pode ser firmado de forma não invasiva, empregando-se a eletrencefalografia de superfície, a vídeo-eletrencefalografia, considerada o padrão-ouro, e a imagem por ressonância magnética. No entanto, quando os resultados dessas investigações são contraditórios, alguns pacientes necessitam de técnicas invasivas, como o vídeo-EEG intracraniano, utilizando eletrodos profundos, placas ou estrias subdurais, que se associam ao aumento do custo diagnóstico e do risco de complicações, como as hemorragias cerebrais e as infecções intracranianas. A espectroscopia de prótons surge como uma possibilidade, dada sua capacidade de avaliar o metabolismo cerebral, por meio das alterações de N-acetil aspartato (NAA), creatina (Cr) e colina (Co), dentre outros ...

show abstract

“…Such factors include the frequency, phase, and amplitude of waveforms that collectively generate various types of IEDs (e.g., sharp waves, spikes, and spike-wave complexes). 9 On the other hand, when the spatiotemporal averaging of electrical signals in the cortex occurs asynchronously when they are projected to the scalp, they will reach the scalp with different latencies, resulting in the formation of peculiar patterns such as long duration (blunted) waveforms or perhaps CMP. This hypothesis is supported by the strong resemblance of CMP to the cardiac M pattern in the RBBB, where delayed right ventricular activation produces a secondary R wave (R') in the right precordial EKG leads.…”

Section: Discussionmentioning

confidence: 99%

EEG spikes resembling cardiac M-shaped waves in the EKG: the cerebral M pattern

Janati¹,

ALGhasab

Aziz

et al. 2017

Ann Clin Neurophysiol

View full text Add to dashboard Cite

Interictal epileptiform discharges (IEDs) in the electroencephalogram (EEG) are electroclinical patterns typified by sharp waves and spikes, and defined as waveforms that are distinct from the background activity due to their high amplitude (typically 2.5-fold higher than the background voltage). Their duration may vary from less than 70 ms (classified as spikes) to 70-200 ms (classified as sharp waves). There is a large body of literature on the characteristics of typical IEDs 1-5 but a paucity of data on atypical IEDs.All scalp-recorded electrical activities are generated by postsynaptic potentials in cortical neurons. It is hypothesized that IEDs represent the summation of excitatory postsynaptic potentials (EPSPs) and inhibitory postsynaptic potentials in the cortex. IEDs in scalp recordings typically have a negative polarity that reflects the action of perpendicularly oriented neurons in the cortex. However, it is noteworthy that in certain types of cerebral insult (particularly congenital CNS anomalies), augmentation of the deep cortical EPSPs may Studies of interictal epileptiform discharges are essential for improving the diagnosis, classification, and management of epilepsy. In this case series we sought to identify the clinical and neurophysiological significance of bifid spikes, whose pattern bears a strong resemblance to the cardiac M pattern. We hypothesize that, analogous to the cardiac M pattern, the cerebral M pattern is generated by a conduction defect associated with asynchronous spatiotemporal averaging of electrical signals in the cortex, resulting in the signals reaching the scalp with different latencies. Unlike the cardiac M pattern, the pathology underlying the cerebral M pattern is unknown, although congenital CNS anomalies may be a culprit.

show abstract

Correlation between scalp-recorded electroencephalographic and electrocorticographic activities during ictal period

Abstract: Multiple factors such as the width of the cortical area involved, amplitude of ictal discharges and degree of synchronization of electrical potentials play important roles in the appearance of ictal EEG recordings, and the relationship between ictal EEG and ECoG is not straightforward.

Cited by 61 publications

References 14 publications

The functional profile of the human amygdala in affective processing: Insights from intracranial recordings

The functional profile of the human amygdala in affective processing: Insights from intracranial recordings

Diagnostic methods for extra-temporal neocortical focal epilepsies: present and future

EEG spikes resembling cardiac M-shaped waves in the EKG: the cerebral M pattern

Contact Info

Product

Resources

About