Figure 5.

Cell groups can be tracked throughout development. (A) Dendrograms generated by unbiased hierarchical cluster analysis of the electrophysiological properties of cells recorded from adult animals (left) and P19–21 (right) animals. Three distinct groups are identified in both age groups. As with the adult groups, PLS analysis identified initial firing frequency and frequency adaptation as key determinants of neuronal grouping at P19–21. (B) Combined analysis of Adult and P19–21 animals reveals overlap between cell groups identified at chronologically sequential ages, indicating cell groups in adult animals can also be identified at younger ages. Solid and dashed lines indicate cells from adult and P19–21 animals, respectively. Line colors in (B) coincide with the line color of group outlines shown in (A).