What happened
Google Research, HHMI Janelia and other collaborators completed the structural map of the brain and central nervous system of a male Drosophila melanogaster: 166,691 neurons, 11,691 neuron types and approximately 125 million synaptic connections.
The reconstruction required taking millions of two-dimensional images obtained through electron microscopy and using AI systems to turn them into three-dimensional neural structures. The final result was also reviewed and annotated by human experts.
Then came the internet.
Engineer Alex Wormuth created an open project that connects each frame of Doom to the model’s sensory neurons; their activity is then translated into movements, turns and shots. When it takes damage, dopamine-related circuits are stimulated as a reinforcement signal. Jessica Paquette did another experiment with Super Mario 64.
Why it matters
This is where it’s worth putting the brakes on the headline.
There’s no conscious fly trapped inside Doom.
A connectome is mainly a map of connections. These experiments apply artificial stimuli to the reconstructed circuit and observe what patterns emerge. Xataka explicitly points out that the results demonstrate neither intelligence nor consciousness.
The scientifically powerful part is something else: there’s now a resource detailed enough to follow connections from visual, auditory or olfactory inputs all the way to complete motor circuits.
The number
After more than 7,500 rounds of Doom, the model described by Xataka could move and shoot, but it still hadn’t managed to kill anyone.
So, for now at least, humanity keeps a small advantage.
Context
The work also makes it possible, for the first time, to compare complete male and female fly nervous systems at synaptic resolution. The researchers identified 7,205 equivalent neuron types, 114 dimorphic ones, 262 specific to males and 69 specific to females.
The challenge scales brutally: Google notes that years of human work are still needed just to validate these maps, and that reconstructing complete mammalian brains remains far beyond our current capabilities.
What’s next
Google and its collaborators are already moving these techniques toward fish and parts of the mouse brain. Each leap increases both the volume of data and the difficulty of verifying that every neuron was reconstructed correctly.
Bottom line
It took science a decade to reconstruct the fly’s nervous system.
It took the internet a few days to ask the inevitable question: can it run Doom?
Sources
Google Research, A connectomics milestone: Mapping the complete male fruit fly brain, September 3, 2026. Google Research Paper in Cell, Sexual dimorphism in the complete connectome of the Drosophila male central nervous system. Google Research Xataka, September 13, 2026. Xataka