Observations on the response to photic stimulation in organic cerebral dysfunction

Kooi, Kenneth A.; Eckman, H. Gerhard; Thomas, Madison H.

doi:10.1016/0013-4694(57)90057-3

Cited by 27 publications

(6 citation statements)

References 22 publications

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“…No patient among the “controls” showed EEG slow responses as large as those illustrated in Figures 4–6. The slow photic responses in the patients of the organic group corresponded to the findings reported by Kooi et al (14).…”

Section: Clinical Studysupporting

confidence: 90%

The Electroencephalogram in Advanced Senile Dementia*

Müller

Kral

1967

J American Geriatrics Society

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Section: Clinical Studysupporting

confidence: 90%

The Electroencephalogram in Advanced Senile Dementia*

Müller

Kral

1967

J American Geriatrics Society

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“…Photic stimulation (PS) has been the most commonly used method of cerebral activation in routine EEG examinations and is known to be a useful method for eliciting paroxysmal EEG activity [18] and for detecting focal or lateralized cerebral dysfunction [19,20]. Previous studies have reported findings suggestive of various visual information-processing impairments in schizophrenia [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Aberrant Functional Organization in Schizophrenia: Analysis of EEG Coherence during Rest and Photic Stimulation in Drug-Naive Patients

Wada

Nanbu²,

Kikuchi³

et al. 1998

Neuropsychobiology

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EEG coherence provides a measure of functional correlations between two EEG signals. The present study was conducted to examine intrahemispheric EEG coherence at rest and during photic stimulation (PS) in 18 drug-naive patients with paranoid schizophrenia and 30 control subjects. Compared with the controls, the schizophrenic patients had significantly higher intrahemispheric coherence of the resting EEG for the delta band, although no significant group differences were found for other frequency bands. EEG analysis during PS showed that the patients also had significantly higher EEG coherence over the left posterior regions. In this study, we also examined the changes in intrahemispheric coherence from rest to the stimulus condition (i.e., PS-related coherence reactivity); the patients were found to show significantly smaller changes, with significant group differences being also confined to the posterior regions in the left hemisphere. These findings provide evidence that schizophrenic patients have abnormal EEG coherence in both resting and stimulus conditions and suggest more diffuse, undifferentiated functional organization within hemispheres. In addition, diminished coherence reactivity suggests a failure of PS-related functional reorganization in schizophrenia.

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“…EEG changes by photic stimuli have been found to be associated with various cerebral abnormalities (Rodin et al 1953;Kooi et al 1957;Kooi and Thomas 1958;Oosterhuis et al 1969). The light-induced abnormalities have been reported in several mental disorders including depression (Kleiber et al 1978), anxiety (Ulett et al 1953) and schizophrenia (Rice et al 1989).…”

Section: Discussionmentioning

confidence: 98%

Nonlinear dynamics of the EEG separated by independent component analysis after sound and light stimulation

Jin

Jeong

et al. 2002

Biological Cybernetics

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The electroencephalogram (EEG) is a multiscaled signal consisting of several time-series components each with different dominant frequency ranges and different origins. Nonlinear measures of the EEG reflect the complexity of the overall EEG, but not of each component in it. The aim of this study is to examine effect of the sound and light (SL) stimulation on the complexity of each component of the EEG. We used independent component analysis to obtain independent components of the EEG. The first positive Lyapunov exponent (L1) was estimated as a nonlinear measure of complexity. Twelve subjects were administered photic and auditory stimuli with a frequency of 10 Hz, which corresponded to the alpha frequency of the EEG, by a sound and light entrainment device. We compared the L1 values of the EEGs and their independent components between baseline and after the SL stimulation. We detected that the L1 values of the EEG decreased after the SL stimulation in all channels except C3 and F4, indicating that the complexity of the EEG decreased. We showed that alpha components increased in proportion but decreased in complexity after the SL stimulation. The beta independent components were found to decrease in proportion and complexity. These results suggest that decreased complexity of the EEG after the SL stimulation may be principally caused by decreased complexity and increased proportion of the alpha independent components. We showed also that theta components increased in complexity after the SL stimulation. We propose that nonlinear dynamical analysis combined with independent component analysis may be helpful in understanding the temporal characteristics of the EEG, which cannot be detected by conventional linear or nonlinear methods.

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Observations on the response to photic stimulation in organic cerebral dysfunction

Cited by 27 publications

References 22 publications

The Electroencephalogram in Advanced Senile Dementia*

The Electroencephalogram in Advanced Senile Dementia*

Aberrant Functional Organization in Schizophrenia: Analysis of EEG Coherence during Rest and Photic Stimulation in Drug-Naive Patients

Nonlinear dynamics of the EEG separated by independent component analysis after sound and light stimulation

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