AI Helps Map Complete Fruit Fly Connectome: 166,000+ Neurons, Largest Yet
On September 4, Google Research (including DeepMind), HHMI Janelia Research Campus, the MRC Laboratory of Molecular Biology and Cambridge University published the complete connectome of an adult male fruit fly's brain and central nervous system in Cell. The roughly 20-year project used AI to fuse millions of 2D images into 3D neuron morphologies, identifying over 166,000 neurons, nearly 11,700 cell types and about 125 million synapses—the largest cellular-level brain map to date.
Confirmed
- This extends previous head-only adult fly connectomes to the entire central nervous system (brain plus ventral nerve cord), with the reconstruction done by AI, setting a record of 166,000+ neurons.
- Per @ymatias, the Cell paper covers 166,000+ neurons and 125 million synapses; Science-affiliated coverage cites 166,700 neurons and 124 million synapses—a minor discrepancy between reports.
- The work was widely covered by @ThePlanckDiver, @ColbyHawker, @DrSingularity, @BraydonDymm and others; Science Corp founder Max Hodak reshared it (per @lukaszkaiser).
- @BraydonDymm notes practical value for research on vision, taste and social behavior; @ThePlanckDiver sees it as foundational data for understanding neural circuits and AI architecture research.
Why it matters
- @ColbyHawker views it as a concrete demonstration of AI for Science and a step toward mapping the human connectome.
- @BraydonDymm cautions that a human connectome remains out of reach for the foreseeable future—this is a milestone in basic neuroscience, not a prelude to mind uploading.
2026-09-04 ~ 2026-09-05 · 12 related posts
- Episode 1: AI Helps Map Complete Fruit Fly Connectome: 166,000+ Neurons, Largest Yet(2026-09-04, 12 posts)
- Episode 2: Full Fruit-Fly Connectome Runs in Minecraft, Driving an In-Game Fly(2026-09-05, 9 posts)
- Episode 3: Google Maps Entire Fruit Fly Brain with 166,000 Neurons(2026-09-06, 4 posts)
- Episode 4: Full Fruit Fly Connectome with 166,700 Neurons Runs Inside Minecraft(2026-09-08, 3 posts)
- Episode 5: Fly Brain Connectome Simulation Plays Beat Saber in Real Time(2026-09-09, 5 posts)
- Episode 6: Google and HHMI Release Complete Male Fruit Fly Brain Connectome(2026-09-09, 7 posts)
- Episode 7: Viral 'Fly Brain Plays Beat Saber' Turns Out to Be Overfit Replay(2026-09-10, 3 posts)
- Episode 8: Fruit Fly Connectome Experiments Raise Consciousness Ethics Concerns(2026-09-11, 3 posts)
- Episode 9: Fly Brain Connectome Mapped — and Made to Play Smash Bros(2026-09-11, 2 posts)
- Episode 10: Google Maps Complete Male Fruit Fly Brain Connectome(2026-09-13, 4 posts)
- Episode 11: Fruit fly brain connectome wired into walking Strandbeest robot(2026-09-13, 3 posts)
- Episode 12: Complete Fruit Fly Brain Connectome Flies Drones with Zero Flight Code(2026-09-14, 5 posts)
- Episode 13: Google and partners release complete adult fruit fly brain connectome(2026-09-15, 3 posts)
- Episode 14: Fruit Fly Brain Uploaded to Robot Drives Autonomous Behavior(2026-09-19, 2 posts)
Primary sources
- Google uses AI to map full fruit fly brain, reconstructing 166,000+ neurons in 3D — burny_tech · 2026-09-04
- Google and HHMI unveil complete male fruit fly connectome with 166,000 neurons — BraydonDymm · 2026-09-04
- Fruit fly connectome complete, but human connectome still a long way off — BraydonDymm · 2026-09-04
- Google and HHMI release full male fruit fly connectome with 166,000 neurons — lukaszkaiser · 2026-09-04
- DeepMind uses AI to map all 166K+ neurons of a fruit fly brain — ColbyHawker · 2026-09-04
- AI maps full fruit fly brain and central nervous system for first time, 166,000+ neurons — Polymarket · 2026-09-04
- [source] Google maps the complete male fruit fly brain in connectomics milestone — ThePlanckDiver · 2026-09-04
- After 20 Years, Complete Fruit Fly Connectome Maps 166,700 Neurons and 124.2M Synapses — burny_tech · 2026-09-04
- Janelia completes full connectome of adult fruit fly's 166,000+ neurons after 20 years — burny_tech · 2026-09-04
3 near-duplicate retellings: Dr_Singularity · ymatias · CurieuxExplorer