Spike-Timing Dependent Plasticity (STDP)
A+ (LTP):
0.50
A− (LTD):
0.30
τ+ (ms):
20
τ− (ms):
25
Fire rate:
0.5
Hz
Fire Pre
Fire Post
Reset
STDP: synaptic weight increases (LTP) when pre fires before post (Δt > 0), and decreases (LTD) when post fires first. The learning window ΔW(Δt) = A+·exp(-Δt/τ+) or -A-·exp(Δt/τ-) shapes neural circuit formation.