Notes

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A collection of fragments of understanding in the pursuit of deeper questions.

Calcium Rule

The Calcium Rule Paper: "Calcium-Based Plasticity Model Explains Sensitivity of Synaptic Changes to Spike Pattern, Rate and Dendritic Location".

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As shown in the previous picture, this rule specifies that the LTP regime applies based on the amount of time above the calcium threshold while the LTD regime applies below the threshold. The threshold is represented by the frequency of synaptic firing, indeed, low frequencies of synaptic firing (approx. 5Hz) produce LTD, while high frequencies of synaptic firing (approx. 50 to 100Hz) produce LTP. This rule results in the same basic STDP profile as before, and there are threshold parameters that can be changed to affect the dynamics.