Intra‐ and interhemispheric EEG differences quantified by spectral analysis

Etevenon, P.; Pidoux, B.; Rioux, Patrice; Peron-Magnan, P.; Verdeaux, G; Deniker, P

doi:10.1111/j.1600-0447.1979.tb00265.x

Cited by 31 publications

(3 citation statements)

References 8 publications

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“…Although the EEG has suggested primarily diffuse or bilateral abnormalities (Itil, 1977, Mirsky, 1969, Stevens et al, 1979, even in studies looking for asymmetries (Giannitrapani & Kayton, 1974), some recent studies focusing on lateralization effects have shown left hemisphere abnormalities. Increased left hemisphere EEG variability has been found in acute (Rochford, Swartzburg, Chowdhrey, & Goldstein, 1976) and paranoid but not hebephrenic schizophrenics (Etevenon et al, 1979). Roemer, Shagass, Straumariis, andAmadeo (1978, 1979) have shown more variable visual and auditory (but not somatosensory) evoked potentials over the left hemisphere in chronic schizophrenics and have suggested that this reflects greater moment to moment fluctuations in the arousal level of the left side of the brain.…”

Section: Cerebral Laterality Brain Dysfunction and Schizophreniamentioning

confidence: 97%

Schizophrenia and brain dysfunction: An integration of recent neurodiagnostic findings.

Seidman¹

1983

Psychological Bulletin

321

122

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This is a critical review and integration of recent evidence demonstrating the frequency, type, and clinical significance of brain dysfunction in schizophrenia. Neuroradiological, neurophysiological, and neuropsychological data suggest brain impairment in at least 20% to 35% of schizophrenic patients. The abnormalities are nonspecific and can result from a variety of causes. Preliminary evidence suggests that there are two or more syndromes that differ in severity and type of brain abnormality, rather than a unitary schizophrenic illness. A complex, variable picture of brain dysfunction, including ventricular enlargement and cerebral atrophy, disturbances of cerebral metabolism, neuropsychologic deficits, and neurologic "soft" signs, is found especially in chronically impaired schizophrenics with "negative" symptoms. Extent and locus of dysfunction in a corticosubcortical arousal-attention system involving areas of the frontal cortex, limbic system, and brain stem reticular formation are hypothesized to determine the relative prominence of "positive" and "negative" symptoms. Future research on neuroanatomy, etiology, and treatment must take into account the heterogeneity of the schizophrenias and might fruitfully utilize the positive-negative dimension.

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Section: Cerebral Laterality Brain Dysfunction and Schizophreniamentioning

confidence: 97%

Schizophrenia and brain dysfunction: An integration of recent neurodiagnostic findings.

Seidman¹

1983

Psychological Bulletin

321

122

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“…Electroencephalography (EEG) is a neuroimaging technique, with very high temporal resolution and good spatial resolution of the whole brain activity caught in its essential nature of an ensemble of electrical oscillations 7 . In fact, quantitative EEG measures have been associated with many cognitive, motivational, sensorimotor, and emotional processes [8][9][10][11][12][13][14][15][16] Typical EEG patterns were defined for many mental disorders; for SZ they include changes in power spectra in multiple frequency bands [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] , functional connectivity 18,[35][36][37][38][39][40][41] , symmetry of the signal [42][43][44][45][46][47][48] , microstates (i.e. successive short time periods during which the configuration of the scalp potential field remains semi-stable) 49 and evoked potentials (i.e.…”

Section: Introductionmentioning

confidence: 99%

Pharmaco-EEG of antipsychotic treatment response: a systematic review

De Pieri,

Rochas,

Sabe

et al. 2023

Schizophr

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Response to antipsychotic medications (AP) is subjected to a wide and unpredictable variability and efforts were directed to discover predictive biomarkers to personalize treatment. Electroencephalography abnormalities in subjects with schizophrenia are well established, as well as a pattern of EEG changes induced by APs. The aim of this review is to provide a synthesis of the EEG features that are related to AP efficacy, including both pre-treatment signatures and changes induced by APs during treatment. A systematic review of English articles using PubMed, PsychINFO and the Cochrane database of systematic reviews was undertaken until july 2023. Additional studies were added by hand search. Studies having as an endpoint the relationship between AP-related clinical improvement and electroencephalographic features were included. Heterogeneity prevented a quantitative synthesis. Out of 1232 records screened, 22 studies were included in a final qualitative synthesis. Included studies evaluated resting-state and task-related power spectra, functional connectivity, microstates and epileptic abnormalities. At pre-treatment resting-state EEG, the most relevant predictors of a poor response were a change in theta power compared to healthy control, a high alpha power and connectivity, and diminished beta power. Considering EEG during treatment, an increased theta power, a reduced beta-band activity, an increased alpha activity, a decreased coherence in theta, alpha and beta-band were related to a favorable outcome. EEG is promising as a method to create a predictive biomarker for response to APs; further investigations are warranted to harmonize and generalize the contradictory results of reviewed studies.

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“…Zu den konsistentesten Ergebnissen der quantitativen EEG-Analyse zählen die Verminderung der absoluten und relativen Alphapower (Iti! et al , 1972;Etevenon et al, 1979;Ford et al, 1986;Fenton et al , 1990;Jin et al, 1990;Saletu et al, 1990) und die relative Powervermehrung in den flankierenden Bändern Delta, Theta und Beta (Lifshitz u. Gradijan, 1974;Vacca et al, 1980;Morihisia et al, 1983;Morstyn et al, 1983;Karson et al, 1988;Gattaz et al, 1992).…”

Section: Introductionunclassified

Quantitatives EEG, Basisstörungen und Rauchen bei ätiopathogenetisch differenten Gruppen paranoid-halluzinatorischer Psychosen - eine explorative Studie

Neuwirth¹,

Andresen²,

Seifert³

et al. 1995

Fortschr Neurol Psychiatr

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We performed an exploratory study of quantitative EEG in aetiopathogenetically different paranoid-hallucinatory psychoses divided into the following groups: a) patients with familial psychoses (n = 12), b) patients with neuropsychological deficits (n = 16), c) patients with alcohol and drug abuse (n = 22) and d) patients with so-called sporadic psychoses (n = 12). We found a significant reduction of relative alpha power in the group with neuropsychological deficits. In the group with familial psychosis there was a significant reduction of absolute delta power and a significant increase of relative beta power and dominant beta frequency, especially for the frontal leads. Patients with drug abuse showed a reduction of absolute beta power and an increase of absolute and relative theta power. The group with sporadic psychosis showed a significant slowing of the dominant beta frequency and a significant increase of the absolute power of fast alpha rhythms. The group with sporadic psychoses showed lowered scores for the paranoid-hallucinatory basic symptom factor. The group with neuropsychological deficits showed the most visceral-somatoform basic symptoms, the highest nicotine consumption, increased dyskinesias and more perinatal complications. This group also showed the highest level of neuroleptic and antiparkinson medication. All in all, the group with neuropsychological deficits showed a complex interaction of somatic-exogenic and medical-iatrogenic factors. Furthermore, there was a significant positive correlation between paranoid-hallucinatory basic symptoms and nicotine abuse and high frequency beta waves.

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Intra‐ and interhemispheric EEG differences quantified by spectral analysis

Cited by 31 publications

References 8 publications

Schizophrenia and brain dysfunction: An integration of recent neurodiagnostic findings.

Schizophrenia and brain dysfunction: An integration of recent neurodiagnostic findings.

Pharmaco-EEG of antipsychotic treatment response: a systematic review

Quantitatives EEG, Basisstörungen und Rauchen bei ätiopathogenetisch differenten Gruppen paranoid-halluzinatorischer Psychosen - eine explorative Studie

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