Spatial summation occurs when neurotransmitters from several presynaptic neurons combine their effects on one postsynaptic neuron to reach the action potential threshold.
Spatial summation occurs when neurotransmitters from multiple presynaptic neurons converge on a single postsynaptic neuron, and their combined effect can reach the threshold to trigger an action potential.
| Front | Spatial summation |
|---|---|
| Back | Many neurones connect to one neurone Small amount of neurotransmitters released from each neurone Can together reach the threshold in postsynatic neurone to reach and trigger an action potential. |
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