它没有剧本It has no script

科学家把一只真果蝇的脑子,切成了几千片超级薄的薄片 (每片比头发丝还薄得多),用电子显微镜一张一张拍下来, 再把每个细胞的形状描出来,数清楚谁连着谁。

Scientists took the brain of one real fruit fly and cut it into thousands of incredibly thin slices — each far thinner than a hair — photographed every slice under an electron microscope, then traced each cell and counted who connects to whom.

这个工程叫 FlyWire,全世界的科学家和志愿者 (其中不少是普通玩家!)一起干了好几年,才画完这张图:

The project is called FlyWire. Scientists and volunteers all over the world — many of them ordinary gamers! — spent years on the map:

我们从整张图里取出和「感觉 → 决定 → 动作」最相关的那 45,808 个细胞, 连接原封不动,装进你的浏览器。每个细胞怎么放电,用的是 Shiu 等科学家论文里的规则。

We took the 45,808 cells most involved in "sense → decide → act", kept every connection exactly as mapped, and loaded them into your browser. The firing rules come from the published model by Shiu and colleagues.

神经细胞不会思考。它只会一件事:攒信号,攒够了就「啪」一下放电。

A nerve cell does not think. It does exactly one thing: it collects signal, and when there's enough — snap — it fires.

• 💧 别的细胞放电,就往它的杯子里倒一点水
• 🕳️ 杯底有个小洞,水一直在慢慢漏掉——所以要倒得够快才攒得起来
• ⚡ 水位碰到红线 → 放电!然后杯子倒空,重新攒
• 🥄 还有些连接不是倒水,是舀水(叫「抑制」),专门劝它闭嘴

• 💧 When another cell fires, it pours a little water into this one's cup
• 🕳️ The cup has a small hole — water keeps leaking out, so the pouring has to be fast enough
• ⚡ Water reaches the red line → it fires! — then the cup empties and starts over
• 🥄 Some connections don't pour, they scoop water out ("inhibition") — their whole job is saying shush

科学家管这个叫「漏水的积分放电」模型(leaky integrate-and-fire)。你脑子里也是这么工作的——只不过你有 860 亿个杯子。

Scientists call this the leaky integrate-and-fire model. Your brain works the same way — you just have 86 billion cups.

游戏下面那排按钮,每个都会点亮一批真实存在的感觉细胞: Each button in the game's tray lights up a set of sense cells that really exist:

用手指直接戳它 = 同时碰到它全身 1,417 根小毛。难怪它吓一跳。 Poking it with your finger = touching all 1,417 hairs at once. No wonder it jumps.

想一想:脑子在头里,腿长在身上,命令怎么送过去? 靠几条又粗又快的「下行神经」——大脑通往身体的电话线。游戏右边那七条会动的杠,就是我们在偷听这七路电话:

Think about it: the brain sits in the head, the legs are on the body — how do orders travel? Through a few thick, fast "descending neurons": the brain's phone lines to the body. The seven moving bars in the game are us listening in on those calls:

杠越长 = 那根线一秒放电的次数越多 = 命令喊得越响。 Longer bar = more spikes per second on that line = the order is shouted louder.