Classification of observed bursting behaviors. A Overview of the different classes of bursting behavior observed in our cultures. Numbers in parentheses indicate plating batch. Vertical bars indicate partial medium replacement times. Hash patterns indicate burst frequency for all types of burst patterns except superbursts. In batch 3, three cultures received full medium replacements (indicated by thicker bars in the lower three cultures of batch 3). One culture in batch 6 got infected after 20 div, and had to be discarded. B Examples of burst pattern classes, with array-wide spike detection rates and gray-scale rasters for all electrodes, all taken from dense cultures. B1 No bursting. B2 Tiny bursts. B3 Fixed size bursts. B4 Variably sized bursts. B5 Long-tailed bursts. B6 Regular superbursts. B7 Inverted superbursts. B8 Dramatic burst rate variation. Gray scales are as in Figure 1.