Frontal Midline Theta Rhythm: Differentiating the Physiological Theta Rhythm from the Abnormal Discharge

Shinomiya, Shigeko; Urakami, Yuko; Nagata, Kazuyoshi; Takahashi, Nao; Inoue, Reiichi

doi:10.1177/155005949402500109

Cited by 13 publications

(6 citation statements)

References 5 publications

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“…O diagnóstico diferencial deve levar em consideração outros eventos que também se projetam na linha média no traçado do EEG, tais como os achados de Shinomiya e col. 16 que definiram dois padrões de atividade teta em Fz: um ocorrendo em indivíduos jovens, em surtos breves, difundindose para regiões anteriores, com ondas regulares e de baixa voltagem, identificado como fisiológico; e outro ocorrendo em indivíduos idosos, em surtos mais longos, com difusão posterior, baixa frequência, ondas irregulares de alta voltagem sendo correlacionado com epilepsia e cefaléias de difícil tratamento 16 . Takahashi e col. 17 descrevem uma atividade teta frontal de linha média , durante a sonolência com correlação fisiológica e ocorrência durante provas que submetiam o indivíduo a intensa atividade mental, enquanto Mukasa 18 relata uma atividade teta frontal de linha média, presente em indivíduos alcoolizados.…”

Section: Discussionunclassified

Epilepsias com focos projetados na linha média: estudo com EEG quantitativo e topográfico (mapeamento cerebral)

Anghinah¹,

Kanda²,

Jorge³

et al. 1998

Arq. Neuro-Psiquiatr.

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RESUMO -Estudamos com EEG quantitativo e topográfico (mapeamento cerebral) quatro pacientes com exames pregressos de EEG convencional mostrando foco de linha média. O estudo quantitativo revelou-se mais preciso na definição do foco, localizando o seu hemisfério de origem e definindo a atividade focal como parassagital. Estes achados deverão ser validados em estudos futuros com amostragem maior.PALAVRAS-CHAVE: epilepsias, focos, linha média, EEG quantitativo, mapeamento cerebral. Epilepsies with midline foci: a study with quantitative and topographic EEGABSTRACT -We report a topographic and quantitative EEG (EEGQT) study of four patients with analogic EEG diagnostics of midline foci. The new study with EEGQT offered an increased definition of the electrical source with advantages in foci localization. These findings should be confirmed with studies including a greater number of patients.KEY WORDS: epilepsies, foci, midline, quantitative and topographic EEG, brain mapping.Desde que foi descrito por Penfield e Jasper em 1946, o foco de linha média (FLM) não tem recebido muita atenção dos pesquisadores 1 . Isto ocorre provavelmente pelas dificuldades técnicas em definir o FLM como uma descarga focal ao invés de generalizada, como já alertavam Tükel e Jasper ao caracterizá-lo 2 , e também por ser um evento pouco frequente, ocorrendo em cerca de 0,05% dos exames de eletrencefalograma (EEG) realizados em um laboratório especializado 3 . Este achado foi melhor definido por Pedley e col. 4 , em 1981, que o caracterizaram como ocorrendo predominantemente em crianças e jovens, associando-se fortemente a crises clínicas e sofrendo ação do sono como elemento ativador. É condição principal o EEG mostrar reversão de fase em FZ, CZ ou PZ 5,6 . Alguns autores associam-no clinicamente a uma prevalência de crises parciais complexas 6,7 , outros encontraram maior relação com crises generalizadas tônico-clônicas 3 .Relatamos os achados em quatro pacientes com FLM e que foram estudados também por EEG quantitativo e topográfico (EEGQT). Devemos destacar que não encontramos na literatura estudos com EEGQT e FLM.

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Section: Discussionunclassified

Epilepsias com focos projetados na linha média: estudo com EEG quantitativo e topográfico (mapeamento cerebral)

Anghinah¹,

Kanda²,

Jorge³

et al. 1998

Arq. Neuro-Psiquiatr.

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“…More detailed analysis information can be found in the sub-sections below. In brief, analyses focused on electrode Fz, as frontal theta oscillations are typically maximal at this electrode 29 . Frequency bands were defined as follows: delta (1-4 Hz), theta (4-8 Hz), alpha (8-13 Hz), beta (13-30 Hz), and gamma (30-50 Hz).…”

Section: Methodsmentioning

confidence: 99%

Section: Eeg Analysesmentioning

confidence: 99%

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Supra-second interval timing deficits and abnormal frontal theta oscillations in individuals with bipolar disorder

Ewald¹,

Trapp²,

Sarrett

et al. 2022

Preprint

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Objectives: Though widely reported by patients, cognitive symptoms associated with bipolar disorder (BD), including deficits in executive function, memory, attention, and timing are under-studied. Work suggests that individuals with BD show impairments in sub-second interval timing tasks (ITT), however, results have been inconclusive regarding supra-second time perception in BD patients. Additionally, the effects of mood or medication status on time perception in BD patients are debated in the literature. Methods: To address this, the present work administered a supra-second ITT concurrent with electroencephalographic (EEG) recordings to patients with BD and neuronormative controls. As this task is known to elicit frontal theta oscillations, which can be abnormal in psychiatric populations, signal from the Fz lead was analyzed at rest and during the task. Results & Conclusions: As hypothesized, results suggest that individuals with BD show impairments in supra-second ITT performance compared to neuronormative controls. Frontal theta power was also reduced compared to controls during the ITT but not during rest. Finally, timing impairments remain detectible in BD patients independent of mood state and use of antipsychotic medication. This suggests that supra-second interval timing deficits are a key characteristic observed in BD. Together with previous work, these findings point to critical timing impairments in BD patients across a wide range of timing modalities and durations.

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“…Analyses focused on electrode Fz, as frontal theta oscillations are typically maximal at this site (33). Frequency bands were defined as: delta (1-4 Hz), theta (4-8 Hz), alpha (8-13 Hz), beta (13-30 Hz), and gamma (30-50 Hz).…”

Section: Eeg Analysesmentioning

confidence: 99%

Supra-second interval timing in bipolar disorder: examining the role of disorder sub-type, mood, and medication status

Ewald

Trapp

Sarrett

et al. 2023

Preprint

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Background: Widely reported by bipolar disorder (BD) patients, cognitive symptoms, including deficits in executive function, memory, attention, and timing are under-studied. Work suggests that individuals with BD show impairments in interval timing tasks, including supra-second, sub-second, and implicit motor timing compared to the neuronormative population. However, how time perception differs within individuals with BD based on BD sub-type (BDI vs II), mood, or antipsychotic medication-use has not been thoroughly investigated. The present work administered a supra-second interval timing task concurrent with electroencephalography (EEG) to patients with BD and a neuronormative comparison group. As this task is known to elicit frontal theta oscillations, signal from the frontal (Fz) lead was analyzed at rest and during the task. Results: Results suggest that individuals with BD show impairments in supra-second interval timing and reduced frontal theta power compared during the task to neuronormative controls. However, within BD sub-groups, neither time perception nor frontal theta differed in accordance with BD sub-type, mood, or antipsychotic medication use. Conclusions: his work suggests that BD sub-type, mood status or antipsychotic medication use does not alter timing profile or frontal theta activity. Together with previous work, these findings point to timing impairments in BD patients across a wide range of modalities and durations indicating that an altered ability to assess the passage of time may be a fundamental cognitive abnormality in BD.

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Frontal Midline Theta Rhythm: Differentiating the Physiological Theta Rhythm from the Abnormal Discharge

Cited by 13 publications

References 5 publications

Epilepsias com focos projetados na linha média: estudo com EEG quantitativo e topográfico (mapeamento cerebral)

Epilepsias com focos projetados na linha média: estudo com EEG quantitativo e topográfico (mapeamento cerebral)

Supra-second interval timing deficits and abnormal frontal theta oscillations in individuals with bipolar disorder

Supra-second interval timing in bipolar disorder: examining the role of disorder sub-type, mood, and medication status

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