The Consciousness Atlas is an interactive web app that visualizes more
than 450 theories of consciousness. It is based on Robert Lawrence
Kuhn's 2024 paper,
"A Landscape of Consciousness". The Atlas maps theories that address phenomenal consciousness - the
subjective feel of experience, such as the redness of red.
What the Atlas is
The Atlas is a visual reference built on Kuhn's taxonomy. It presents
the full set of theories at once so you can explore the field visually
and open any theory to read its entry, like an encyclopedia with
structured entries. Each theory entry shows a concise identity line,
conceptual ground, suggested mechanism, empirical notes, implications,
and sources.
Why this exists
Consciousness is studied across disciplines - neuroscience,
philosophy, and sometimes spiritual or anomalous-state research.
Kuhn's paper collects and organizes hundreds of theories along a
spectrum from most physical to least physical. The Atlas puts that
organization into a visual form so readers, students, and researchers
can quickly see how different positions relate and where each theory
sits on the spectrum.
How it works
Theories are grouped into ten main categories, arranged by their
stance on the physical-to-nonphysical spectrum. Examples of categories
include Materialism, Non-Reductive Physicalism, Functionalism,
Quantum-based theories, Panpsychism, Monism, Dualism, Idealism,
Anomalous States, and Challenge Theories. The app shows the whole map
at once. Click any theory to read its structured entry, which includes
references to canonical sources and named thinkers.
Who it is for
- Students learning philosophy of mind and cognitive science
-
Researchers and lecturers looking for an at-a-glance comparative
resource
-
Journalists and writers who need a quick reference to the range of
positions
-
Curious readers who want a clear view of what people mean when they
talk about consciousness
What the Atlas does not do
The Atlas does not endorse or rank theories. It is a visualization and
reference based on Kuhn's taxonomy - collect and present, not judge.
It does not attempt to settle the hard problem of consciousness. It is
a tool for exploration and comparison.
A note from Kuhn
Kuhn explicitly states the project's purpose: "collect and categorize,
not assess and adjudicate." The Consciousness Atlas follows that
approach. The data and structure are derived from Kuhn's paper;
feedback and suggested corrections are welcome, but the app is a
visualization layer on top of Kuhn's work.
Kuhn was not involved in the design or content of the Consciousness
Atlas, other than his original paper, 'A Landscape of Consciousness,'
which is the sole source.
FAQ
What is phenomenal consciousness?
Phenomenal consciousness refers to subjective experience - the
qualitative feel of being aware, like the taste of coffee or the
redness of red.
How many theories does the Atlas include?
The Atlas visualizes over 220 individual theories, grouped into ten
broad categories.
Does the Atlas show which theory is true?
No. The Atlas presents theories neutrally. It is a map, not an
argument for any single position.
Is the Atlas academic?
The Atlas is based on an academic source - Robert Kuhn's 2024 paper,
"A Landscape of Consciousness" - and links to canonical sources
where available.
Summary
The Consciousness Atlas is a straightforward visualization tool: it
presents Kuhn's taxonomy as a single, explorable map and lets users
open individual theory entries to read structured, referenced
summaries. It is designed to make this complex field easier to survey
and to serve as a practical reference.
Materialism › Neurobiological
Dendritic Integration Theory
Consciousness as Dendritic Integration of Top-Down and Bottom-Up Signals
Dendritic Integration Theory holds that conscious perception depends on a cellular event, the nonlinear integration of top-down and bottom-up signals in the apical dendrites of layer 5 pyramidal neurons in the neocortex. When feedback from higher areas coincides with feedforward sensory input, the dendrite fires a calcium spike that amplifies the neuron's output, and Larkum and Aru propose that this amplification gates information into awareness.
Matthew Larkum, Jaan Aru
What consciousness is
Consciousness is identified with the integration of two information streams inside layer 5 pyramidal neurons, with feedback arriving at the distal apical dendrites and feedforward input arriving near the cell body. Aru and colleagues suggest consciousness is heavily influenced by, or possibly synonymous with, this integration.
Mind and body
Conscious states depend on, and may be identical to, specific biophysical events in cortical neurons. The theory treats mind as a product of brain microcircuitry and posits nothing beyond it.
Mechanism
Coincidence detection in the apical dendrite. When feedback from higher areas matches feedforward sensory input, the dendrite generates a calcium spike that amplifies the neuron's firing, and this amplification selects what enters awareness.
Core claims
- Apical dendrites of layer 5 pyramidal neurons perform nonlinear integration of top-down and bottom-up inputs.
- Coincident distal and proximal input triggers dendritic calcium spikes that amplify the neuron's response, and Larkum hypothesizes that this match underlies perceptual awareness.
- General anesthesia disrupts dendrite-soma coupling, blocking consciousness while much other brain activity continues.
- In conscious states the dendritic mechanism enables sustained thalamocortical dynamics that are blocked in unconscious states.
Criticisms
The anesthesia findings show that dendrite-soma coupling is necessary for consciousness, which falls short of showing it is sufficient. The stronger claim that consciousness may be synonymous with dendritic integration goes further than evidence linking the mechanism to conscious states.
Implications
- AI consciousness: Conditional
- Since consciousness here depends on a specific biophysical mechanism in cortical neurons, an artificial system would qualify only if it reproduced that two-compartment dendritic integration and its gating role.
- Survival beyond death: No
- Since consciousness here is a product of dendritic activity in living cortex, nothing survives the brain's death.
- Meaning and purpose: Humanistic only
- The theory explains awareness through neural mechanisms and implies no cosmic purpose.
- Virtual immortality: Conditional
- A digital copy would be conscious only if it reproduced the dendritic integration and thalamocortical dynamics the theory requires.
Related theories
Sources
- Dendritic Integration Theory, Matthew Larkum and Jaan Aru (2013)
- The Apical Dendrite Theory of Consciousness, David LaBerge and Ray Kasevich (2007)
Explore all theories on the Consciousness Atlas
