Application of the change-point analysis to the investigation of the brain’s electrical activity

Kaplan, Arline; Shishkin, Sergei L.

doi:10.1007/978-94-015-9530-8_7

Cited by 48 publications

(83 citation statements)

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“…It has been shown experimentally that the sequences of segments between different local EEG signals are indeed synchronized to a certain extent and form short-term metastable topological combinations (OM), with different size (number of cortical locations involved) and life-span (temporal duration) [257,289,290,434,444,447]. We argue that at the phenomenological level, the lasting OM would be experienced as a "phenomenal present" of consciousness.…”

Section: Synchronized Quasi-stationary Eeg Segments Operational Modumentioning

confidence: 93%

“…Later this general framework was used mostly as an "umbrella" notion in a series of experimental studies [257,289,290,[434][435][436][437][438][439][440][441][442][443][444][445][446][447][448][449][450] leading to the accumulation of an enormous amount of empirical neurophysiological data which have permitted to extensively develop, broaden, and modify the whole conception and establish OA as a theoretical framework in its present form compromise between simplicity, neurophysiological accuracy, and cognitive and phenomenal plausibility.…”

Section: Integration Of Space-time Of Brain and Mind Through Unified mentioning

confidence: 99%

“…8), and thus imposes a discontinuity in local cortical dynamics [226,258]. The transition from one segment to another directly reflects the change in the activity of neuronal assemblies [193,434,475]. 67 Trehub calls it the 3D retinoid [367].…”

Section: Mechanismmentioning

confidence: 99%

“…72 In mathematical statistics this is known as the "change-point problem" [476]. milliseconds and indicates the functional life-span of neuronal assembly or the duration of operation produced by this assembly: Since the transient neuronal assembly functions during a particular time interval, this period is reflected in the EEG as a stabilized interval of quasi-stationary activity [258,434,449].…”

Section: Mechanismmentioning

confidence: 99%

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

Fingelkurts

Neves

2010

Physics of Life Reviews

165

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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Section: Synchronized Quasi-stationary Eeg Segments Operational Modumentioning

confidence: 93%

Section: Integration Of Space-time Of Brain and Mind Through Unified mentioning

confidence: 99%

Section: Mechanismmentioning

confidence: 99%

Section: Mechanismmentioning

confidence: 99%

See 2 more Smart Citations

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

Fingelkurts

Neves

2010

Physics of Life Reviews

165

233

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“…Furthermore, since functional connectivity is generated by means of reciprocal interactions in the TCC networks, it makes a suitable method for investigating the electrophysiological correlates of GWT inspired architectures. Although we argue that EEG coherence estimation is informative regarding functional brain states in terms of functional connectivity, the relationship between EEG coherence estimates and functional connectivity has been deemed problematic (e.g., Breakspear, 2002;Fingelkurts et al, 2003;Horwitz, 2003;Kaplan & Shishkin, 2000). Furthermore, since EEG signals show a finite correlation even when recorded from separate subjects, one must be cautious when interpreting EEG coherence as a measure of functional connectivity (Shaw, 1984).…”

Section: Introductionmentioning

confidence: 90%

Extending the global workspace theory to emotion: Phenomenality without access

Schutter

Honk

2004

Consciousness and Cognition

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Recent accounts on the global workspace theory suggest that consciousness involves transient formations of functional connections in thalamo-cortico-cortical networks. The level of connectivity in these networks is argued to determine the state of consciousness. Emotions are suggested to play a role in shaping consciousness, but their involvement in the global workspace theory remains elusive. In the present study, the role of emotion in the neural workspace theory of consciousness was scrutinized by investigating, whether unconscious (masked) and conscious (unmasked) display of emotional compared to neutral facial expressions would differentially modulate EEG coherence. EEG coherence was measured by means of computing an average EEG coherence value between the frontal, parietal, and midline scalp sites. Objective awareness checks evidenced that conscious identification of the masked facial expressions was precluded. Analyses revealed reductions in EEG coherence in the lower frequency range for the masked as compared to unmasked neutral facial expressions. Crucially, a decline in EEG coherence was not observed for the emotional facial expressions. In other words, the level of EEG coherence did apparently vary as a function of awareness, but not when emotion was involved. The current finding suggests that EEG coherence is modulated by unconscious emotional processes, which extends common views on the global workspace architecture of consciousness.

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Enhancement of GABA‐related signalling is associated with increase of functional connectivity in human cortex

Fingelkurts¹,

Fingelkurts²,

Kivisaari³

et al. 2004

Human Brain Mapping

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Structural or operational synchrony analysis with EEG was conducted in order to detect functional interaction between cortical areas during an enhanced inhibition induced by the GABAergic agonist lorazepam in a double-blind, randomized, placebo-controlled, cross-over study in eight healthy human subjects. Specifically, we investigated whether a neuronal inhibitory system in the brain mediates functional decoupling of cortical areas. Single-dose lorazepam administration resulted in a widespread increase in the inter-area functional connectivity and an increase in the strength of functional long-range and interhemispheric connections. These results suggest that inhibition can be an efficient mechanism for synchronization of large neuronal populations.

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Application of the change-point analysis to the investigation of the brain’s electrical activity

Cited by 48 publications

References 0 publications

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

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

Extending the global workspace theory to emotion: Phenomenality without access

Enhancement of GABA‐related signalling is associated with increase of functional connectivity in human cortex

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