Table 2.

Primary morphometric loading (with absolute values of 0.25 or higher) of the first six principal components of the dendritic arbors used in cluster analysis.

Principal Component	Morphometric features	Loading
PC1 (27% of cumulative variance): branching density	Max. remote amplitude angle	0.29
	Avg. remote amplitude angle	0.27
	Max. local amplitude angle	0.26
	Avg. terminal degree	0.25
	Max. branch order	0.25
	Avg. branch path length	−0.28
	Avg. remote tilt angle	−0.26
PC2 (43% of cumulative variance): size	Summed total arbor length	0.4
	Total arbor height	0.36
	Max. path distance from soma	0.34
	Total arbor width	0.33
PC3 (58% of cumulative variance): branch tortuosity	Avg. tortuosity	0.42
	Avg. fractal dimension	0.34
	Avg. local tilt angle	−0.34
PC4 (64% of cumulative variance): arbor flatness	Avg. remote torque angle	0.63
	Avg. local torque angle	0.62
PC5 (70% of cumulative variance): fractal dimension and tilt angles	Max. fractal dimension	0.37
	Avg. fractal dimension	0.35
	Avg. remote tilt angle	0.35
	Avg. tortuosity	0.25
	Max. remote tilt angle	−0.32
	Avg. remote amplitude angle	−0.36
PC6 (75% of cumulative variance): partition asymmetry and depth	Avg. partition asymmetry	0.41
	Total arbor depth	0.35