Investigating features of irregular fluctuations of cortical synapse data

Abstract—We describe results of investigating features of irregular fluctuations of the individual response of an excitatory cortical synapse to stimulation from the view-point of dynamical systems. The behaviour of the data is irregular fluctuations (short-term variabilities) and long-term trends. At the first onset we investigate two features of irregular fluctuations. We first apply the small-shue surrogate method to investigate whether temporal correla-tions in irregular fluctuations of the data are absent. Based on the result we then apply the truncated Fourier transform surrogate method to investigate nonlinearity in the irregular fluctuations. The results indicate that the irregular fluctua-tions have temporal correlations and are linear. 1