A. Transfer functions depicting the summation of synaptic inputs for linear dendrites. B. Transfer function for saturating dendritic nonlinearities (solid line), as well as the identity (dotted line). C. Same as B for superlinear dendrites. D-F. "Triplet correlations" (see text) between the postsynaptic cell and its presynaptic inputs, shown for D. linear, E. sublinear, and F. superlinear dendrites. Axes represent the varying statistics of the presynaptic spike trains, i.e., their firing rates and the correlations between them.