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\subsection{Variability of neurons}  \cite{doi:10.1371/journal.pone.0007903} \cite{Salt_2009}  \cite{doi:10.1371/journal.pone.0007903} \cite{Salt_2009}  Softky, W. R., & Koch, C. (1993). The highly irregular firing of cortical cells is inconsistent with temporal integration of random EPSPs. The Journal of Neuroscience, 13(1), 334-350.