Voltage and current transfers in steady-state. Box plots show 10th, 25th, 50th, 75th and 90th percentiles of standardized and area weighted voltage- (A) and current transfers (D) in steady-state measured from dendritic points to the soma in limb moving MNs in the cervical (shaded boxes) and lumbar (open boxes) segments. Higher and lower percentiles were weighted relative to the median (50th percentile) and used as descriptors for cluster analysis of MNs. The 10th and 90th as well as the 25th and 75th percentiles are shown by the wings and by the borders of boxes respectively, the median is marked by the line within the box (see insert). Dendrograms show segmental segregation tendencies between the cervical and lumbar MNs based on voltage and current transfer properties under high (voltage: part B, current: part E) and low (voltage: part C, current: part F) background synaptic activities. Different levels of synaptic background activities were modeled by varying the specific dendritic membrane resistance (Rmd). High activity: Rmd = 5000 Ωcm2 and low activity: Rmd = 50000 Ωcm2. In cluster analyses shown, the Ward’s method was used and the weighting factors for percentiles were: 0.2 for the 10th and 90th percentiles and 0.8 for the 25th and 75th percentiles. MN labels starting with letters C and L stand for the cervical and lumbar neurons respectively.