Dan Sylveste
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constantinejn.bsky.social
Dan Sylveste
@constantinejn.bsky.social
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constantinejn.bsky.social
The stack is hilariously modular and quite the cute little beast of engineering. It’s the 2/3 circuit that is a little beast of simulation due to the parallel coupling.
Figure 2. How known cortical connections join the layer 6 → 4 and layer 2/3 circuits to form an entire V1/V2 laminar model. Inhibitory interneurons are shown filled-in black. (a) The LGN provides bottom-up activation to layer 4 via two routes. First, it makes a strong connection directly into layer 4. Second, LGN axons send collaterals into layer 6, and thereby also activate layer 4 via the 6 → 4 on-center off-surround path. The combined effect of the bottom-up LGN pathways is to stimulate layer 4 via an on-center off-surround
November 12, 2025 at 1:25 AM
constantinejn.bsky.social
Just shocked at how little these circuits care for GPUs. The 6 cell cortical stack does have some nasty parallelism which is N^2 for the lateral inhibition, so GPU is most useful there, but other than that, SIMD is kicking proverbial ass on dis. Quite happy to see this.
November 12, 2025 at 1:16 AM