Fig. 5.

The processes of merging and taking interspike intervals (ISI) for obtaining the second test statistic based on the compression ratio. If there are some repeated patterns of spatio-temporal spikes, then we can also find repeated patterns in the resulting interspike intervals. These parts help to make the compressed file smaller. In the above example, (1.05,1.10,1.18), (3.70,3.75,3.83), and (7.26,7.31,7.39) show repeated firing patterns: spikes in the second and third neurons are delayed from the ones in the first neuron by 0.05 and 0.13, respectively. After merging and taking ISI, this pattern can be seen as repeats of 0.05 followed by 0.08. These repeats make the compressed file smaller.