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Target activity is sensitive to the frequency of narrow calcium spikes. (A) True frequency encoding occurs when the relative frequency ω changes while both amplitude S0 and average 
stay constant. (B) An example of true frequency decoding is shown here. The mean target activity 
is plotted against ω using Eq. 7. The values of 
in the limit of very slow and very fast oscillations (Eqs. 13 and 14, respectively) are indicated by dashed lines. Parameters: σ = 10, γ = 0.25.
