Figure 4
![Figure 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1744-8069-8-53/MediaObjects/12990_2012_Article_514_Fig4_HTML.jpg)
Unsupervised clustering of neurons in LI of the ACC. A), The classification of layer I neurons by using Ward’s method. B), Matching table of Ward cluster and cluster generated by k-means algorithm. C &D), The silhouette plot of the clusters by using Ward’s method and k-means clustering, respectively.