PART 01
输入Inputs
x1、x2、x3 是进入单元的三路数值。x1, x2, and x3 are incoming values.
01 · 三票不会同权01 · Three votes need not count equally
三个信号一起投票时，为什么一票能推亮灯，另一票却把结果往回拉？When three signals vote together, why can one push the lamp on while another pulls the result back?
02三路输入神经元Three-Input Neuron
乘加过阈值Multiply, add, threshold加权和 zWeighted sum z
—
Σ xiwi
阈值Threshold
0.60
必须严格超过must strictly exceed
输出灯Output lamp
—
activation(z)
每条边显示自己的乘积。试着把某个权重变成负数：它会把加权和往反方向拉。Each edge shows its product. Make one weight negative and watch it pull the weighted sum in the opposite direction.
03神经元里的 4 个零件Four Parts Inside a Neuron
乘 · 加 · 开关Multiply · add · gatePART 02
权重Weights
w 决定每路信号的方向与影响强度。Each w sets a signal's direction and influence.
PART 03
加权和Weighted sum
三个乘积在汇总槽里加成 z。The three products add into z in the sum slot.
PART 04
激活输出Activated output
阈值函数把 z 变成灯亮或灯灭。The threshold function turns z into lamp on or off.
04最小机制：先逐路乘，再统一加Minimal Mechanism: Multiply Each Path, Then Add
y = f(Σ xiwi)
z = x1w1 + x2w2 + x3w3; y = step(z)
上方每条边标出一个乘积，汇总槽显示 z，灯显示 step(z >
0.60)。三处读数可以逐项核对。Every edge above shows a product, the sum slot shows z, and the lamp shows step(z > 0.60). You can verify
the calculation term by term.
改变输入或权重Change x or w对应乘积改变Its product changes
乘积相加Add products汇总槽得到新 zThe slot gets a new z
检查阈值Check threshold过线后灯才翻转Lamp flips only after crossing
05边界实验：把所有权重清零Boundary Test: Zero Every Weight
主动制造失败Create a failure输入全开，影响全无Full inputs, zero influence
把三路输入都设成 1，却把权重全部设成 0。信号再大，乘积仍为 0，灯不会亮。Set every input to one but every weight to zero. No matter how large the inputs are, every product remains zero and the lamp stays off.
尚未执行。当前三路权重并不相同。Not run yet. The current three weights differ.
✗ 神经元会理解输入的含义。A neuron understands what inputs mean.
→ ✓ 它只执行确定的乘、加和激活计算。It performs fixed multiply, add, and activation operations.
✗ 输入大就一定影响大。A large input always has a large effect.
→ ✓ 实际影响由输入与权重的乘积决定。Actual influence is the input-weight product.
✗ 只要有正输入，输出灯就会亮。Any positive input turns the lamp on.
→ ✓ 所有加权项相加后还必须越过激活门槛。The full weighted sum must still cross the activation threshold.
06 · 一句话带走06 · One line to keep