Freud’s iceberg metaphor has long been used to describe (un)consciousness: a huge unconsciousness supports a tiny tip of consciousness. Inspired by this, research has assumed that unconscious discriminative processing persists into consciousness, employing contrastive analysis to isolate the neural correlates of consciousness (NCC). For example, in electroencephalography (EEG) studies, features...
Consciousness science remains caught between a first-person approach that cannot independently corroborate its data and a third-person approach that excludes its target of explanation. We argue that this is a false dichotomy, and propose a third option, the first-person plural perspective (FPP): the position that the primary route of epistemic access to the structure of experience is the plural...
The classical problem of Other Minds has dogged philosophers for millennia; asking if we have any way to truly understand the experience of another mind. We know our own intrinsic experience by acquaintance, but can only ever hope to possess an extrinsic description of another's, with the two separated by an acquaintance gap. Structural approaches aim to characterise experience in terms of a...
The article introduces a partial order structure to study the relations between levels and contents of conscious experience within a formal and mathematical model. Inspired by Husserl’s phenomenology, our account models structural aspects of experiences as layers that can be experienced in potentiality or in actuality, composing further experiences and imposing an order among them. From our...
Abstract* Characterizing qualitative aspects of subjective experiences, qualia, remains a challenging open problem. The recent Qualia structure paradigm proposes capturing qualia through massive relations with other qualia. A concrete method for this involves measuring pairwise similarities. This approach has been successfully applied to reveal similarities and differences in qualia structures...
Recent work in the structural approach to consciousness has shown great promise as a research paradigm for the formal and empirical study of the phenomenal qualities of experience, i.e., qualia. In this paradigm, qualia are characterized by modeling the internal organization of parts within an experience, or by modeling external relations between instances of experience. A major next step for...
A central obstacle to a science of qualia is not only that qualia are subjective, but that we lacka principled way to individuate them. Before asking which neural mechanisms generate qualia,we must ask what counts as one quale rather than a compound of several experientialelements. Here we propose that qualia, in the narrow sense, should be defined asindecomposable units of phenomenal...
Contemporary consciousness science faces an impasse: competing theoretical frameworks-structuralist versus functionalist, universal versus local, intrinsic versus extrinsic-appear to be inducing philosophical deadlocks and conceptual standstills. While these debates have generated valuable insights, they have proceeded in parallel, without a systematic framework for understanding their...
Recent advances in consciousness neuroscience have exposed a critical impasse: competing theoretical frameworks, structuralist vs. functionalist (Fleming & Shea 2024, 2024b; Song 2024, Ellia & Tsuchiya 2024; Kleiner 2024), universal vs. local (Albantakis et al. 2023; Kanai & Fujisawa 2024; Fleming 2024); intrinsic vs. extrinsic (Cohen and Dennett 2011; Doerig et al. 2019; Tsuchiya et al 2020;...
Whether qualitative aspects of consciousness, or qualia in short, are equivalent across individuals is a foundational scientific question. Testing this is challenging because one cannot assume a shared mapping between stimuli and private experience (my “red” may be your “green”) [1–3]. Previously, we proposed a structural characterization of qualia [4, 5] and the quantitative assessment of...
Structural descriptions of qualitative aspects of conscious experience (qualia) offer a rigorous empirical approach to study consciousness. Mathematical structures describing qualia can be mapped to mathematical structures derived from brain activity and underlying neuronal connectivity. That is, rather than merely identifying the co-occurrence of specific neuronal activity patterns with...
Consciousness has long been a focus of philosophical inquiry. Philosophers have employed thoughts supported by language and logic as a primary tool to examine the essence and structure of consciousness in mostly adult humans. Language elevates the abstraction of thought and has significantly contributed to the advancement of civilization. Within an individual, language plays a significant role...
This perspective paper explores the bidirectional influence between language emergence and the relational structure of subjective experiences, termed qualia structure, and lays out a constructive approach to the intricate dependency between the two. We hypothesize that the emergence of languages with distributional semantics (e.g., syntactic-semantic structures) is linked to the coordination of...
The effects of top-down attention on perception have been intensively studied using binary categorization tasks (e.g., seen vs. unseen). However, such tasks poorly characterise the quality of experience, or qualia, for short. To characterise attentional effects on qualia, we combined a dual-task attention paradigm with similarity rating tasks to examine whether relational structures of qualia...
What is a possible physical substrate of the qualitative aspects of consciousness (qualia)? Answering this question is a central goal of consciousness research. Due to their subjective and ineffable nature, finding a quantitative way to characterise qualia from verbal description has thus far proven elusive. To overcome the challenge of expressing subjective experience, recent structural and...
Waking levels of human consciousness are known to be supported by the integrity of complex structures and processes in the brain, yet how they are exactly regulated by neurobiological mechanisms remains uncertain. Here a space-time-resolved inference-based framework is applied to estimate the neurophysiological variables of a whole-cortex model and analyze the neural mechanism correlates of...
Magneto/electroencephalography (M/EEG) studies of dreaming are an essential paradigm in the investigation of neurocognitive processes of human consciousness during sleep, but they are limited by the number of observations that can be collected per study. Dream research also involves substantial methodological and conceptual variability, which poses problems for the integration of results. To...
Consciousness has long been a focus of philosophical inquiry. Philosophers have employedthoughts supported by language and logic as a primary tool to examine the essence andstructure of consciousness in mostly adult humans. Language elevates the abstraction ofthought and has significantly contributed to the advancement of civilization. Within an individual,language plays a significant role to...
The neural mechanisms of consciousness remain elusive. Previous studies on both human and non-human animals, through manipulation of level of conscious arousal, have reported that specific time-series features correlate with level of consciousness, such as spectral power in certain frequency bands. However, such features often lack principled, theoretical justifications as to why they should be...
This commentary engages with Fleming and Shea's (2024) recent work on computational functionalist theories of consciousness through a structural lens. We address three key aspects: the role of subjective experience in theory building, the hypothesis regarding local lateral connectivity in sensory areas, and the implications of "silent units" for consciousness. We argue that while their...
The nature of the relationships between qualitative aspects of consciousness, or qualia, and their physical substrates remains unclear. The problem of qualia is one of the biggest challenges among the enigmas of consciousness. One difficulty in qualia research is characterization of qualia. Verbal descriptions and simple behavioral responses are unable to capture the richness of qualia, the...
Whether one person's subjective experience of the "redness" of red is equivalent to another's is a fundamental question in consciousness studies. Intersubjective comparison of the relational structures of sensory experiences, termed "qualia structures", can constrain the question. We propose an unsupervised alignment method, based on optimal transport, to find the optimal mapping between the...
Examination of the subjective qualitative aspects of an experience, or "qualia" in short, is a fundamental and core aspect of consciousness research. How can we characterize the particular quality of redness, i.e. a red quale? Based on a recent proposal of the structural characterization of qualia, which did not rely on verbal descriptions, we developed a task that obtained pairwise similarity...
Recent neuroscientific research has advanced our understanding of consciousness, yet the connection between specific qualitative aspects of consciousness, known as "qualia," and particular brain regions or networks remains elusive. Traditional methods that rely on verbal descriptions from participants pose challenges in neuroimaging studies. To address this, our group has introduced a novel...
This commentary engages with recent work on computational functionalist theories of consciousness through a structural lens. We address three key aspects: the role of subjective experience in theory building, the hypothesis regarding local lateral connectivity in sensory areas, and the implications of "silent units" for consciousness. We argue that while their structural turn is welcome, many...