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No one has shown that mind uploading is impossible in principle. But human whole-brain emulation has not been achieved, and even a computer model that convincingly behaved like a person would not settle whether that person’s original subjective experience continued. Those are separate questions: whether a brain can be measured and emulated, and whether an emulation would still be the person.
What does “mind uploading” mean?
The phrase can refer to more than one claim. Whole-brain emulation (WBE) means measuring the relevant structure and state of a particular brain, then reproducing its causal information processing on another computational substrate. The goal is not merely to simulate how brains work in general, but to model a specific individual. “Mind uploading” is also used for the broader hypothetical transfer or copying of memories and mental content—and sometimes implies that the person survives the process. That last implication is not established by building an emulation.
A useful test of the distinction is to ask two questions separately: could a model reproduce the person’s mental functions, and what would show that the original person continued to experience the world? There is no agreed scientific pass criterion for the second question.
Why a connectome is not a complete mind
A connectome is a map of connections between neurons. It can reveal the brain’s wiring, but a wiring diagram alone does not specify every feature that could affect how the brain functions. The 2026-08-08 Mind Uploading guide on scientific fundamentals identifies synaptic strengths, cellular dynamics, neuromodulation, glial interactions and plasticity as potentially relevant. Neuromodulators can change circuit behavior without changing the wiring diagram; learning also changes how a system responds over time.
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It remains unknown which of these features an emulation would need to capture, at what resolution, and whether the required information could be recovered from a particular brain. A detailed map is therefore not automatically a working model of the brain’s changing activity.
What has been built, and how far is that from a human emulation?
Small-organism work demonstrates progress in mapping and modeling, not a human upload or proof of consciousness. The 2026-08-08 Mind Uploading guide reports the following scale figures and milestone, drawing on the studies it cites:
| Subject or milestone | Reported figure or result | What it establishes |
|---|---|---|
| Adult fly brain | 139,255 neurons and approximately 55 million synapses; figures reported by the 2026-08-08 Mind Uploading guide, citing Dorkenwald et al., Nature (2024) | A completed adult-fly connectome at that reported scale; not a human brain map |
| Human brain | Approximately 86 billion neurons and 150 trillion synapses; estimates reported by the 2026-08-08 Mind Uploading guide. It attributes the neuron estimate to Herculano-Houzel (2009); the synapse figure is approximate. | Estimates of scale, not evidence that a complete human connectome has been measured |
| Adult fly computational model | A connectome-based model, as summarized by the 2026-08-08 Mind Uploading guide from Shiu et al., Nature (2024) | Reproduction of behaviorally relevant sensorimotor responses, not a demonstrated conscious fly upload |
A 2024 review, “Future projections for mammalian whole-brain simulations based on technological trends in related fields,” reported that human whole-brain simulation had not been achieved as of that year, citing inadequate computational performance and brain-measurement data. That is a dated assessment of the field, not a timeless proof that it cannot be done.
Where could the process fail?
WBE is a chain of dependent tasks. Success at one stage would not by itself solve the later stages:
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- Preserve or fix the brain. The material must remain sufficiently intact for the information needed by later stages to be measured.
- Image it. The measurement must capture relevant structure and state at an adequate resolution.
- Reconstruct neurons and connections. Imaging data must be turned into a reliable model of cells and synapses; errors or prohibitive cost could limit scale.
- Infer functional rules. The reconstruction must represent more than visible connections if other dynamics prove essential. Multiple parameter sets can also fit similar observations, making it difficult to identify a person’s underlying functional model uniquely.
- Run the emulation. The model must operate on a computational substrate and interact with a body and environment in ways that support meaningful evaluation.
- Validate it. Tests would need to establish what the model can predict or reproduce. The 2026-08-08 Mind Uploading status overview identifies the lack of agreed validation criteria as a continuing obstacle.
Measurement and scaling
Success with a fly does not show that human-scale imaging and reconstruction are practical. The much larger human brain presents a scaling problem, while the 2024 mammalian-simulation review identified both measurement data and computational performance as constraints. The sources do not establish that either barrier is insurmountable; they also do not show that a complete human brain can currently be scanned and reconstructed for emulation.
Model fidelity
Even a structurally accurate reconstruction could leave important functional details unspecified. The unresolved issue is not simply whether a scanner can resolve finer features, but which features are necessary for the model to reproduce a particular person’s processing, including how it changes with experience. The available overview reports no experimental answer for the resolution needed to reproduce a mind.
Validation and identity
A model might match observed behavior or cognitive performance without proving that it reproduces subjective experience. Behavioral resemblance can be tested in principle; whether the original person’s first-person perspective continues is a different claim for which the sources identify no generally accepted test.
Would an emulation still be you?
Even if a technically successful emulation were made, the word “upload” could conceal different possibilities. A scan-and-copy process might create a model that remembers the same life and behaves like the person, while leaving open whether the original experience continues. Gradual replacement with neural prostheses is another conceptual proposal; it raises its own identity question. The Carboncopies Foundation discusses these as hypothetical approaches, not available procedures. The sources do not settle whether copying, gradual replacement or another imagined method preserves first-person identity.
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This is not just a question of how accurate the model is. An emulation could be functionally convincing while the continuity of the original person remains unresolved. No source here establishes a procedure that can verify that continuity.
Does the Carboncopies Foundation say uploading is impossible?
The Carboncopies Foundation FAQ says, “Uploading a human mind into such a clone is not yet possible.” The surrounding passage concerns placing a mind into a genetic clone. It describes that specific scenario as not currently possible; it does not prove that every conceivable form of whole-brain emulation is impossible in principle.
What conclusion does the evidence support?
“Not possible today” and “impossible in principle” are not interchangeable. The sources describe an unachieved human goal with substantial measurement, reconstruction, modeling, computing and validation challenges. They do not prove that those challenges can never be overcome. And overcoming them would still leave the separate question of whether an emulation’s experience is continuous with the original person’s.
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