From ad400e971af4a4f8acc331d81234d8a45fb13c8f Mon Sep 17 00:00:00 2001
From: Alina Rojas <117298822+alinarojas@users.noreply.github.com>
Date: Mon, 18 Aug 2025 15:36:19 +0200
Subject: [PATCH] Update homeostatic_stdp_at_inhibitory_synapes.py
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Fix iSTDP update rule (Eq.15): swap pre/post trace handling
- Pre-spike now increments zj and applies Δw = ηG(zi+1)
- Post-spike now increments zi and applies Δw = ηG zj
This corrects the flipped implementation of the iSTDP rule.
---
 .../synapses/homeostatic_stdp_at_inhibitory_synapes.py    | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/examples/synapses/homeostatic_stdp_at_inhibitory_synapes.py b/examples/synapses/homeostatic_stdp_at_inhibitory_synapes.py
index 018325669..a2fece46f 100755
--- a/examples/synapses/homeostatic_stdp_at_inhibitory_synapes.py
+++ b/examples/synapses/homeostatic_stdp_at_inhibitory_synapes.py
@@ -78,13 +78,13 @@
 dzj/dt = -zj / tau_stdp : 1 (event-driven)
 """
 on_pre = """
-zi += 1.
-wij += eta * G * zj
-"""
-on_post = """
 zj += 1.
 wij += eta * G * (zi + 1)
 """
+on_post = """
+zi += 1.
+wij += eta * G * zj
+"""
 synapse = b2.Synapses(
     presynaptic_neuron, postsynaptic_neuron,
     model=synapse_model, on_pre=on_pre, on_post=on_post