Figure 4

Principal component analysis of hippocampal and cortical feature vectors. Each column represents a principal component analysis of the 11-dimensional feature vectors of all recordings at a given age (days in vitro). In the scatter plot, each point represents one recording projected down into the two dimensions that account for maximal variance and is coloured according to its cell type. Each graph shows the cumulative fraction of variance accounted for by the principal components. CTX, cortex; DIV, days in vitro; HPC, hippocampus; PC, principal component.