EEG Mapping in Psychiatry: Studies on Type I/II Schizophrenia Using Motor Activation

Günther, W.; Steinberg, R.; Petsch, R.; Streck, P.; Kugler, J.

doi:10.1007/978-3-642-72658-3_49

Cited by 8 publications

(6 citation statements)

References 26 publications

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“…Enlargement coexisted with increased bilateral blood flow measured by single photon emission computed tomography following dominant hand motor activation in those with positive symptoms. However, there were no task-induced changes in blood flow in those with negative symptoms, a result endorsed with topographical EEG (Guenther et al 1989). Abnormalities of movement after-effects indicative of an abnormal increase in callosal transmission have been reported in patients with case-note evidence of first-rank symptoms (Tress et al 1983).…”

Section: Syndrome-related Asymmetries In Interhemispheric Connectivitymentioning

confidence: 91%

“…Among these findings were abnormalities in right temporal activity in catatonic patients and in left-sided placements in chronic paranoid patients with auditory hallucinations. Guenther et al 1986Guenther et al , 1989Guenther et al , 1991 compared motor tasks that varied in complexity and dependence on sensorimotor integration, all involving the right hand. In the first two reports, which involved mixed groups of medicated schizophrenia patients, subjects failed to show the normal increase in power in primary sensory and motor areas of the left hemisphere but often showed overactivation of the right hemisphere.…”

Section: Eeg Spectral Power Considering First the "Resting" Eeg Eteve...mentioning

confidence: 99%

“…In summary, aside from affirmative EEG results in studies that set out to test the syndrome-asymmetry model (Gruzelier et al 1990(Gruzelier et al , 1993, there were reports of relations between positive symptoms and the left hemisphere (Stevens and Livermore 1982;Coger and Serafetinides 1983;Etevenon et al 1983) and negative symptoms and the right hemisphere (Stevens and Livermore 1982;Etevenon et al 1983;Guenther et al 1989;Merrin and Floyd 1992). The locus of the syndrome-asymmetry relations proved to be widespread, which in the majority of reports included posterior brain activity extending as far as the occipital lobe, and in the case of the withdrawn syndrome, did not require a task-activated EEG to produce the EEG asymmetries.…”

Section: Eeg Spectral Power Considering First the "Resting" Eeg Eteve...mentioning

confidence: 99%

“…The locus of the syndrome-asymmetry relations proved to be widespread, which in the majority of reports included posterior brain activity extending as far as the occipital lobe, and in the case of the withdrawn syndrome, did not require a task-activated EEG to produce the EEG asymmetries. Thalamocortical involvement was implied by abnormalities in the activated EEG, as shown by failures in desynchronization (Guenther et al 1986(Guenther et al , 1989(Guenther et al , 1991Gruzelier et al 1990) and in abnormal stimulus intensity relations (Gruzelier et al 1993). Together, these results imply the involvement of subcortical arousal mechanisms that have generalized cortical influences rather than discrete module-specific cortical asymmetry.…”

Section: Eeg Spectral Power Considering First the "Resting" Eeg Eteve...mentioning

confidence: 99%

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Functional Neuropsychophysiological Asymmetry in Schizophrenia: A Review and Reorientation

Gruzelier

1999

Schizophrenia Bulletin

117

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In reviewing the neuropsychophysiological evidence of functional asymmetry it is proposed that schizophrenia is characterized by a greater dispersion of leftward and rightward asymmetries. The two extremes are represented by active (left greater than right) and withdrawn (right greater than left) syndromes, as is the case with psychometric schizotypy. Syndrome-asymmetry relations extended beyond fronto-temporal systems to include posterior activity, infracortical motoneuron excitability, and individual differences in interhemispheric connectivity and directional biases. Central to these are lateral imbalances in thalamo-cortical and callosal arousal systems, while centrality to schizophrenia follows evidence of reversals in asymmetry with changes in symptom profile, clinical recovery, and neuroleptic treatment. Affinities are found in intact animals from challenge-induced turning tendencies representing coordinated activity of attentional, motor, and reinforcement systems. In both patients and animals, neuroleptics have reciprocal interhemispheric effects, with a bidirectionality that depends on syndrome or endogenous turning preference. Bidirectionality implicates nonspecific thalamic system (NSTS) and not limbic projections. It is proposed that the asymmetries arise from endogenous influences of genes, hormones, and early experience including stressors on NSTS asymmetry, and these underpin approach/withdrawal behavior that is manifested in temperament, personality, and clinical syndrome, and which precedes language development.

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Section: Syndrome-related Asymmetries In Interhemispheric Connectivitymentioning

confidence: 91%

Section: Eeg Spectral Power Considering First the "Resting" Eeg Eteve...mentioning

confidence: 99%

Section: Eeg Spectral Power Considering First the "Resting" Eeg Eteve...mentioning

confidence: 99%

Section: Eeg Spectral Power Considering First the "Resting" Eeg Eteve...mentioning

confidence: 99%

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Functional Neuropsychophysiological Asymmetry in Schizophrenia: A Review and Reorientation

Gruzelier

1999

Schizophrenia Bulletin

117

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“…140 Additional evidence of heterogeneity in the schizophrenic population has been provided in QEEG studies by other groups. 141,142 Findings of asymmetry in schizophrenia have been inconsistent. However, these findings depend upon whether measurements were made over anterior or posterior regions.…”

Section: Schizophreniamentioning

confidence: 99%

Conventional and Quantitative Electroencephalography in Psychiatry

Hughes¹,

John²

1999

JNP

408

296

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Electrical activity of each brain region is homeostatically regulated, resulting in predictable frequency composition of the background EEG. Replicated normative databases have established that the EEG power spectrum is independent of ethnic background. Artifact-free EEG evaluated relative to such norms displays few deviant values in healthy, normally functioning individuals. In subjects with psychiatric disorders, high proportions of abnormal findings have been reported with good concordance and high specificity and sensitivity across numerous studies, distinctive within a wide variety of disorders and often contributing to differential diagnosis and selection of treatment. New three-dimensional QEEG imaging methods offer an economical alternative to other functional brain imaging modalities.

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Positive Symptoms of Schizophrenia: Response to Haloperidol and Remoxipride is Associated with Increased Alpha EEG Activity

Moore¹,

Tucker²,

Brin

et al. 1997

Hum. Psychopharmacol. Clin. Exp.

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EEG Mapping in Psychiatry: Studies on Type I/II Schizophrenia Using Motor Activation

Cited by 8 publications

References 26 publications

Functional Neuropsychophysiological Asymmetry in Schizophrenia: A Review and Reorientation

Functional Neuropsychophysiological Asymmetry in Schizophrenia: A Review and Reorientation

Conventional and Quantitative Electroencephalography in Psychiatry

Positive Symptoms of Schizophrenia: Response to Haloperidol and Remoxipride is Associated with Increased Alpha EEG Activity

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