EEG coherence has structure in the millimeter domain: subdural and hippocampal recordings from epileptic patients

Bullock, Theodore H.; McClune, Michael C.; Achimowicz, Jerzy; Iragui-Madoz, Vicente; Duckrow, Robert B.; Spencer, Susan S.

doi:10.1016/0013-4694(95)93347-a

Cited by 157 publications

(88 citation statements)

References 23 publications

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“…According to Bullock and Başar (1988) and Bullock et al (1995), no significant coherences were found in the neural networks of invertebrates, in contrast to the higher coherences between distant structures that were recorded in mammalian and human brains. The highest coherences were found in the subdural structures of the human brain (Bullock 2006).…”

Section: Fundamental Analysis Of the Coherence Functionmentioning

confidence: 87%

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A new interpretation of P300 responses upon analysis of coherences

Güntekin

Başar

2010

Cogn Neurodyn

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Previous studies on cognitive dynamics showed that oscillatory responses of P300 are composed of mainly delta and theta responses. In the present study, for the first time, the long-distance intra-hemispheric event related coherence (auditory oddball paradigm) and evoked coherence (simple sound) were compared in order to evaluate the effects of cognitive tasks on the long-distance coherences. Seventeen healthy subjects (8 female, 9 male) were included in the study. The coherence was analyzed for delta (1-3.5 Hz), theta (4-7.5 Hz) and alpha (8-13 Hz) frequency ranges for (F 3 -P 3 , F 4 -P 4 , F 3 -T 7 , F 4 -T 8 , F 3 -O 1, F 4 -O 2 ) electrode pairs. The coherence to target responses were higher than the non-target and simple auditory response coherence. This difference is significant for the delta coherence for both hemispheres and for theta coherences over the left hemisphere. The highest coherences were recorded at fronto-temporal locations for all frequency bands (delta, theta, alpha). Furthermore, frontoparietal coherences were higher than the fronto-occipital coherences for all frequency bands (delta, theta, alpha).These results show that the fronto-temporal and fronto-parietal connections are most relevant for the identification of the target signal. This analysis open the way for a new interpretation of dynamic localization results during cognitive tasks.

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Section: Fundamental Analysis Of the Coherence Functionmentioning

confidence: 87%

“…It is also important to mention the studies of Bullock's research group: Bullock et al (1995) clearly showed that the connectivity (coherence) between neural groups is a main factor for the evolution of cognitive processes.…”

Section: Fundamental Analysis Of the Coherence Functionmentioning

confidence: 99%

A new interpretation of P300 responses upon analysis of coherences

Güntekin

Başar

2010

Cogn Neurodyn

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“…Because the unified mean-field potentials of neuronal assemblies are wave-mechanical phenomena, the magnitude of their modulations will be proportional only to the number of those neurons that synchronize their operations (postsynaptic potentials) [23]. Indeed, for neurons that are arranged randomly, their induced unified fields will tend to sum to zero; but the assembled organization of neocortex, with the hierarchy of spatial-temporal mosaics of neuronal assemblies, EEG-signal registered from diferent cortex locations will tend to amplify unified mean-field potentials of local neuronal assemblies (see the important studies of Bullock and coworkers [198,199]). …”

Section: Macroscopic Level Of Brain Organizationmentioning

confidence: 99%

“…5), even when electrodes are located less than 1 mm apart [198,199,227,228], indicating that the brain generates a highly structured and dynamic extracellular electric field [23]. For example, in classic experiments of Freeman [229][230][231] EEG activity was measured within the olfactory bulb of rabbits and cats; and the existence of spatially structured bursts of EEG activity was demonstrated in response to sensory stimuli with average amplitude of about 100 microvolts across recording 31 The "state-dependent networks" model proposed by Buonomano and Merzenich [211] suggests that the ubiquity of time-varying neuronal properties allows spatially remote neuronal assemblies to inherently encode temporal information.…”

Section: Electroencephalogrammentioning

confidence: 99%

Natural world physical, brain operational, and mind phenomenal space–time

Fingelkurts

Neves

2010

Physics of Life Reviews

168

233

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Concepts of space and time are widely developed in physics. However, there is a considerable lack of biologically plausible theoretical frameworks that can demonstrate how space and time dimensions are implemented in the activity of the most complex life-system -the brain with a mind. Brain activity is organized both temporally and spatially, thus representing space-time in the brain. Critical analysis of recent research on the space-time organization of the brain's activity pointed to the existence of so-called operational space-time in the brain. This space-time is limited to the execution of brain operations of differing complexity. During each such brain operation a particular short-term spatio-temporal pattern of integrated activity of different brain areas emerges within related operational space-time. At the same time, to have a fully functional human brain one needs to have a subjective mental experience. Current research on the subjective mental experience offers detailed analysis of space-time organization of the mind. According to this research, subjective mental experience (subjective virtual world) has definitive spatial and temporal properties similar to many physical phenomena. Based on systematic review of the propositions and tenets of brain and mind space-time descriptions, our aim in this review essay is to explore the relations between the two. To be precise, we would like to discuss the hypothesis that via the brain operational space-time the mind subjective space-time is connected to otherwise distant physical space-time reality.Key words: spatial, temporal, consciousness, cognition, operation, architectonics, EEG, field, metastability, physics, coordinative dynamics, self-organization, cortex.

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“…The coherences can also show some variability over time, i.e. by changing the analysis epoch duration (Bullock et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Gamma Coherences in the Default Mode Resting State as a Measure of Consciousness Level

et al. 2016

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Recent findings indicate that the default mode resting state network (DMRSN) is closely associated with conscious awareness. Thus changes in consciousness level could be reflected in turn in the DMRSN functional state. One of the most important requirements for proper network function is connectivity within the network structural constituents. One of the measures of functional connectivity is analysis of the EEG coherences. In this study we have examined changes in the mean coherences in the gamma spectral band 30-45 Hz in the DMRSN during general anaesthesia (GA) in the open thorax surgery were investigated in twenty patients. They were compared with physiologic EEG findings in twenty alert subjects and the mathematical model of brain death. Results of this study indicate that the decrease in coherences in the physiologic EEG and the patients with one lung ventilation (OLV) groups was roughly proportional to the increasing distance between the electrodes. This created some kind of a structure in the DMRSN. In the OLV group the main finding was a decrease in the coherences in the gamma band. Ten of the anaesthetized subjects showed a clear burst suppression pattern. During this condition the coherences in the pairs connecting the posterior parts of the network decreased. Moreover, the differences between the connections of the anterior to posterior parts of the DMRSN and connections between the posterior parts of the DMRSN were almost lost. However, they showed still highly significant differences in all items when compared with the mathematical model of brain death. In summary the results suggest that the functional connectivity in the DMRSN assessed by mean coherences could be a reliable method for assessing the depth of GA and may be useful for understanding disorders of consciousness in general.

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EEG coherence has structure in the millimeter domain: subdural and hippocampal recordings from epileptic patients

Cited by 157 publications

References 23 publications

A new interpretation of P300 responses upon analysis of coherences

A new interpretation of P300 responses upon analysis of coherences

Natural world physical, brain operational, and mind phenomenal space–time

Gamma Coherences in the Default Mode Resting State as a Measure of Consciousness Level

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