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# README.md
**The astrocyte is not globally uniform — it is locally selective**:
## Calcium wave
The calcium wave does not behave like a uniform broadcast. It has two distinct modes:
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The second is a **propagating wave**. When activity is sustained and intense enough, the calcium signal spreads from process to process across the astrocyte body and even into neighbouring astrocytes via gap junctions. This is the threshold event that IP3 models. Once the wave propagates, the response is no longer selective — it affects multiple synapses under that astrocyte's territory.
**What this means for your model**:
### Implication for the model
Your current model simulates a single tripartite synapse — one presynapse, one postsynapse, one astrocyte process. In that context the selectivity question does not arise because there is only one synapse to serve.