HHMI Janelia, Google Research, and collaborators published the first complete wiring map of an adult male fruit fly’s central nervous system — brain, optic lobes, and ventral nerve cord — in Cell on September 3, 2026. Google Research puts the atlas at more than 166,000 neurons and about 125 million synaptic connections, calling it the largest brain map by neuron count released so far.
Within days, secondary coverage highlighted a Georgia Tech master’s student who said he wired that open connectome into a Minecraft sandbox with help from a frontier coding model. That second thread is interesting if the code lands; it is not yet a finished scientific product. The durable news is the public MaleCNS resource and how AI reconstruction made a decade of imaging usable.
Confirmed
- Project leadership is credited to HHMI Janelia with Google Research and Cambridge-linked collaborators; the Cell paper title Google Research cites is “Sexual dimorphism in the complete connectome of the Drosophila male central nervous system.”
- The map includes the ventral nerve cord (roughly analogous to a spinal cord), so sensory pathways can be linked to motor outputs on one atlas — not only the head brain.
- Google Research says the reconstruction was annotated and proofread by human experts at Janelia, and that the dataset can be viewed and downloaded through Neuroglancer.
- AI systems used for reconstruction include Google’s flood-filling networks and the newer PATHFINDER pipeline; earlier work already produced a verified female fruit fly brain map, which this male map is meant to complement for sex-difference and individual-variability studies.
- Google’s consumer science post states the male CNS includes on the order of 11,691 neuron cell types among more than 166,000 reconstructed neurons, and shows example visuomotor pathways such as R1–R6 visual neurons through to motor neuron DNg13.
- Three companion papers released the same day apply the map to vision, taste, and social behavior research, per Google’s posts.
Unknown
- A Georgia Tech graduate student named Evan Smith has been widely cited (via secondary posts such as 36Kr) as running a Minecraft-based MaleCNS sandbox in about two days with help from GPT-6 Astra. As of this writing, Brocker has not independently verified a public repository, peer-reviewed methods note, or OpenAI product page that confirms the model name and the simulation’s fidelity.
- Smith’s own framing, as quoted in that coverage — V1 still under development, help from GPT-6 Astra, code/mod coming soon — means the game demo should be treated as early engineering theater until weights, dynamics choices (for example leaky integrate-and-fire assumptions), and sensory encoding are inspectable.
- Whether the Minecraft agent uses the full ~166k-neuron graph, a pruned visuomotor subgraph, or a loosely inspired controller is not established in primary Google/Janelia materials.
- Behavioral motion in a block world does not imply subjective experience; connectome-driven animation is not evidence of consciousness.
Our take
Lead with MaleCNS, not Matrix memes. The story that will still matter in six months is an open, sex-compared fly CNS plus Google’s reconstruction stack — the kind of artifact labs can actually query. The Minecraft weekend project is a useful illustration that engineering glue is getting cheaper; it is not proof that whole-brain simulation is now a hobbyist commodity. Wait for the code, then judge how much biology survived the port.
