GoKawiilMaleCNS Virtual Fly
A Drosophila brain simulator that runs the whole Traced universe of the released male CNS connectome — 165,122 neurons and every one of the 25,563,197 edges between them — inside a physical fly body, in closed loop, on one GPU.
That universe is 165,122 of the 166,700 bodies the MaleCNS paper annotates: the runtime graph is the subgraph induced by annotation status Traced , a decision recorded in ADR-2026-002. Widening it to Traced+Assign+Anchor would add 2,443 bodies (1.48%) and 60,281 edges (0.24%).
It is not a recovered copy of the imaged fly, a complete biological emulation, or a digital twin. What it is, and the evidence behind every number on this page, is set out in What is and is not claimed.
Twelve flies, twelve connectomes, one scene
Twelve full NeuroMechFly bodies in one MuJoCo scene, scattered at random over a 30 mm disc and aimed at random. Each fly executes its own copy of that whole graph every 15 ms coupling interval, over one shared connectivity allocation with independent membrane, adaptation, spike-counter and noise state. Food spheres and pillars are geoms with real contact pairs, and the bodies share one solver step, so an object stops a fly through the physics rather than through a rule. Flies do not collide with each other — FlyGym gives every fly geom contype 0 and this world writes no fly-fly contact pair, so two bodies pass through one another. What couples them is vision: each fly enters the others' encoders as a sphere of one declared radius.
That vision is analytic, not optical. The encoder is handed each object's exact position and radius and computes a bearing and an angular size from them; there are no camera pixels, no ray casting, no occlusion, no colour and no texture anywhere in the loop.
Nothing steers them but two descending population rates read out of their own network.
Onset is on a timer and the video says so: every fly stands still for 1.5 s by construction and then needs its drive held above threshold for 150 ms, so all twelve start walking at 1.665 s. The timer decides when. What the stimulus decides is whether — the control below never leaves the standing state at all.
GIF Twelve independent neural states over one connectivity allocation. Brightness is spike count with a declared decay. 0.30x speed. Six legs in a tripod gait, adhesion switching per leg, every contact solved by MuJoCo. Exact against its control — same seed, same bodies, encoder held at baseline.
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