Recurrence Quantification Analysis of Spontaneous Electrophysiological Activity during Development: Characterization of In Vitro Neuronal Networks Cultured on Multi Electrode Array Chips

Figure 4

Recurrence plot of the interspike interval time series channel 35, DIV 15. Reconstruction parameters: 𝜏 = 2 and 𝑑_𝐸 = 5, 𝜀 = 1300 (using Euclidean absolute distance). Both 𝑥- and 𝑦-axis report the interspike interval (isi) after reconstruction and dark points correspond to those for which the Euclidean distance is lower than the cutoff ratio.