Disrupted relationship between intrinsic neural timescales and alpha peak frequency during unconscious states – A high-density EEG study

NeuroImage, Journal Year: 2022, Volume and Issue: 265, P. 119802 - 119802

Published: Dec. 9, 2022

Our brain processes the different timescales of our environment's temporal input stochastics. Is such a processing mechanism key for consciousness? To address this research question, we calculated measures on shorter (alpha peak frequency, APF) and longer (autocorrelation window, ACW) resting-state high-density EEG (256 channels) recordings compared them across consciousness levels (awake/conscious, ketamine sevoflurane anaesthesia, unresponsive wakefulness, minimally conscious state). We replicate extend previous findings of: (i) significantly ACW values, consistently over all states unconsciousness, as measured with ACW-0 (an unprecedented version well-know ACW-50); (ii) slower APF frequency sliding, in four unconscious states. Most importantly, report highly significant correlation state, while their relationship is disrupted In sum, demonstrate relevance brain's capacity (APF) (ACW) - including consciousness. Albeit indirectly, e.g., through analysis electrophysiological activity at rest, supports temporo-spatial alignment to stochastics, relating neural timescales, one predisposing factor

Language: Английский

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Theories of consciousness and psychiatric disorders – A comparative analysis

Neuroscience & Biobehavioral Reviews, Journal Year: 2023, Volume and Issue: 152, P. 105204 - 105204

Published: April 29, 2023

Disorders of consciousness represent an efficient way to test theories consciousness' (ToCs) predictions. So far, ToCs have mostly focused on disorders quantitative awareness such as coma, vegetative state, spatial neglect and hemianopia. Psychiatric disorders, by contrast, received little attention, leaving their contribution research almost unexplored. Therefore, this paper aims assess the relation between psychiatric - that is, extent which current can account for symptomatology. First, I review direct indirect evidence linking each ToC psychiatry disorders. Next, differentiate based theoretical methodological ground, highlighting how they distinctively address neural, cognitive, phenomenological aspects conscious experience and, in turn, symptoms. Finally, refer one specific symptom directly compare ToCs' explanatory power. Overall, Temporospatial Theory Consciousness (TTC) appears provide a more comprehensive suggesting novel dimension (i.e., form consciousness) may be needed qualitative alterations experience.

Language: Английский

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Topographic-dynamic reorganisation model of dreams (TRoD) – A spatiotemporal approach

Neuroscience & Biobehavioral Reviews, Journal Year: 2023, Volume and Issue: 148, P. 105117 - 105117

Published: March 2, 2023

Dreams are one of the most bizarre and least understood states consciousness. Bridging gap between brain phenomenology (un)conscious experience, we propose Topographic-dynamic Re-organization model (TRoD). Topographically, dreams characterized by a shift towards increased activity connectivity in default-mode network (DMN) while they reduced central executive network, including dorsolateral prefrontal cortex (except lucid dreaming). This topographic re-organization is accompanied dynamic changes; slower frequencies longer timescales. puts dynamically an intermediate position awake state NREM 2/SWS sleep. TRoD proposes that DMN leads to abnormal spatiotemporal framing input processing both internally- externally-generated inputs (from body environment). In dreams, away from temporal segregation integration results often highly self-centric mental contents as well hallucinatory-like states. We conclude topography dynamics core features TroD, which may provide connection neural activity, e.g., experience during their "common currency".

Language: Английский

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Mathematized Phenomenology and the Science of Consciousness

Published: April 15, 2024

In this contribution, we emphasize the relevance of mathematical approaches to first-person perspective. We briefly discuss why is necessary and mathematics plays a special role when it comes integrating scientific (empirical) philosophical (theoretical) projects. also sketch some potential ways that could be used in phenomenology, based on selection four ``phenomenological primitives'' characterize constitution: intentionality, minimal subjectivity, lifeworld, time consciousness. spell out topological toymodel refer contemporary using modern (e.g. category theory). then how usefully applied (neuro)scientific study consciousness throughout stress need highlight (and formalize) phenomenology's transcendental character.

Language: Английский

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Resonating with the World: Thinking Critically about Brain Criticality in Consciousness and Cognition

Information, Journal Year: 2024, Volume and Issue: 15(5), P. 284 - 284

Published: May 17, 2024

Aim: Biofields combine many physiological levels, both spatially and temporally. These biofields reflect naturally resonant forms of synaptic energy reflected in growing spreading waves brain activity. This study aims to theoretically understand better how continuum may be reflective consciousness, cognition, memory, thought. Background: The metabolic processes that maintain animal cellular functions are enhanced by coherence. Internal biological-system coordination sensitivity particular stimuli signal frequencies two aspects coherent physiology. There exists significant support for the notion exogenous biologically non-biologically generated entrains human systems. All living things have either comparable or coherent; therefore, eventually, all species will a shared resonance. An organism’s biofield activity resonance what its life allow it react stimuli. Methods: As grow spread activity, temporal spatial frequency effectively regulated time delay (T) inter-layer signals layered structure mimics mammalian cortex. From ubiquitous noise, different types can arise as function T. One is coherent, T rises, so does frequency. Results: Continued growth eventually causes wavelength abruptly increase. Two expand simultaneously randomly interfere an area values result. Conclusion: We suggest because this extraordinary dualism, which has roots phase relationships amplified waves, essential memory retrieval, whereas random represent original cognition.

Language: Английский

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Non-Separability of Physical Systems as a Foundation of Consciousness

Entropy, Journal Year: 2022, Volume and Issue: 24(11), P. 1539 - 1539

Published: Oct. 26, 2022

A hypothesis is presented that non-separability of degrees freedom the fundamental property underlying consciousness in physical systems. The amount a system determined by extent and number involved. Non-interacting feedforward systems have zero consciousness, whereas most interacting particles appear to low consciousness. By contrast, brain circuits exhibit high complexity weak but tightly coordinated interactions, which support therefore applies both classical quantum cases, we highlight formalism employing Wigner function (which limit becomes Liouville density function) as potentially fruitful framework for characterizing and, thus, system. appears be consistent with Integrated Information Theory Orchestrated Objective Reduction may help reconcile two. It offers natural explanation properties points methods estimating promising ways

Language: Английский

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Auditory inputs modulate intrinsic neuronal timescales during sleep

Communications Biology, Journal Year: 2023, Volume and Issue: 6(1)

Published: Nov. 20, 2023

Abstract Functional magnetic resonance imaging (fMRI) studies have demonstrated that intrinsic neuronal timescales (INT) undergo modulation by external stimulation during consciousness. It remains unclear if INT keep the ability for significant stimulus-induced primary unconscious states, such as sleep. This fMRI analysis addresses this question via a dataset comprises an awake resting-state plus rest and stimulus states We analyzed measured temporal autocorrelation supported median frequency (MF) in frequency-domain. Our results were replicated using biophysical model. There two main findings: (1) prolonged while MF decreased from to N2 resting-state, (2) shortened increased auditory The model these demonstrating slowed populations simulate sleep compared state. Conversely, under sine wave input simulating state sleep, model’s regions yielded returned level. highlight preserve reactivity stimuli of unconsciousness like enhancing our understanding brain dynamics their stimuli.

Language: Английский

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Does artificial intelligence exhibit basic fundamental subjectivity? A neurophilosophical argument

Phenomenology and the Cognitive Sciences, Journal Year: 2024, Volume and Issue: 23(5), P. 1097 - 1118

Published: Feb. 26, 2024

Abstract Does artificial intelligence (AI) exhibit consciousness or self? While this question is hotly debated, here we take a slightly different stance by focusing on those features that make possible both, namely basic fundamental subjectivity. Learning from humans and their brain, first ask what mean Subjectivity manifest in the perspectiveness mineness of our experience which, ontologically, can be traced to point view. Adopting non-reductive neurophilosophical strategy, assume view exhibits two layers, most neuroecological higher order mental layer. The layer mediated timescales world as further evidenced empirical data sense self. Are there corresponding shared with AI mineness? Discussing current neuroscientific evidence, deny view, let alone mineness. We therefore conclude that, per state, does not subjectivity henceforth no self models such ChatGPT similar technologies.

Language: Английский

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Does Body Memory Exist? A Review of Models, Approaches and Recent Findings Useful for Neurorehabilitation

Brain Sciences, Journal Year: 2024, Volume and Issue: 14(6), P. 542 - 542

Published: May 25, 2024

Over the past twenty years, scientific research on body representations has grown significantly, with Body Memory (BM) emerging as a prominent area of interest in neurorehabilitation. Compared to other representations, BM stands out one most obscure due multifaceted nature concept “memory” itself, which includes various aspects (such implicit vs. explicit, conscious unconscious). The memory originates from field phenomenology and been developed by groups studying embodied cognition. In this narrative review, we aim present compelling evidence recent studies that explore definitions explanatory models BM. Additionally, will provide comprehensive overview empirical settings used examine results can be categorized into two main areas: (i) how influences our memories, (ii) their broadest sense, could generate and/or influence metarepresentations—the ability reflect or make inferences about one’s own cognitive those others. We emphasize significance experimental involving patients neurological psychiatric disorders, ultimately analyzing these findings an ontogenic perspective.

Language: Английский

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What does it mean for consciousness to be multidimensional? A narrative review

Frontiers in Psychology, Journal Year: 2024, Volume and Issue: 15

Published: June 20, 2024

A recent development in the psychological and neuroscientific study of consciousness has been tendency to conceptualize as a multidimensional phenomenon. This narrative review elucidates notion dimensionality outlines key concepts disagreements on this topic through viewpoints several theoretical proposals. The reviewed literature is critically evaluated, main issues be resolved by future empirical work are identified: problems dimension selection aggregation, well some ethical considerations. seemingly first comprehensively overview specific aspect science.

Language: Английский

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