An uploaded animal brain reproduces something it learned

The long shot behind every story about uploading a mind: read a brain out completely, run the reading as a program, and get the same creature back. The honest test is small. Teach an animal something, map its brain, and see whether a simulation built from the map does what the animal learned, without being taught again. The complete wiring diagram of a fruit fly's brain was published in 2024 and a simulation built from it produces some of the fly's reflexes, but no simulation has yet reproduced a memory that one particular animal formed. That is the gap.

What would count

A specific animal is trained on a task it did not know before; its brain is then read out (by imaging, slicing or any other method) and a simulation built from that readout performs the learned task at above-chance accuracy without further training, in a peer-reviewed report.

Who settles it: Peer-reviewed reports naming the animal, the task, the readout method and the simulation's score

Where it stands

Idea only. Not yet shown to work in any living animal, so there is no record to point at. Longer than 20 years, if ever.

How it could happen

First, a complete wiring diagram of a small brain, which exists for a fruit fly and a larval zebrafish and is being built for a mouse. Second, a way to read not only the wiring but the strength of each connection and the chemical state of each cell, since learning lives there; this is the missing step. Third, a model of each cell good enough that the simulated brain, given the simulated body's senses, behaves like the real one; the 2024 fly simulations are a start. Fourth, the experiment itself: train, read out, simulate, test. A fly or a worm would do.

Where today's science would have to give way

Reading connection strengths and cell states from a fixed brain at the scale of a whole animal. Today's methods see the wiring, not the weights, and the weights are what the memory is; the chemistry that sets them is destroyed by the fixing and slicing that lets the wiring be seen. Either a readout that preserves it or a proof that the wiring alone is enough would have to come first, and neither exists for any animal.

The last reading

Once a week every upgrade is read against the news, against what would count above. Open a line to see what that week held. Every reading of this upgrade is on this week's reading.

• 16 October 2026 Nothing new

  Nothing in the window meets the test. Eon Systems' fruit-fly emulation in a simulated body (reported February to April 2026, company statements with no peer-reviewed paper) produces walking, grooming and feeding, which are innate; no simulation built from a readout has reproduced a behaviour the animal learned. Eon says it plans a mouse within two years, which is a plan.

Notes

Kept on the tree as the charter requires, with its mechanism and breaking point stated. The fly connectome (2024) and the simulations built on it reproduce reflexes such as grooming and feeding that every fly has, which is behaviour from the wiring, not from learning. The worm has had a wiring diagram since 1986 and no simulation of it has reproduced a learned behaviour either. A company claimed in March 2026 to have "uploaded" a fly, meaning a wiring-based model driving a simulated body through innate behaviours; no peer-reviewed report and no learned behaviour.