An apparatus for applying a signal to a nerve for the treatment of a disorder includes a main electrode body of biocompatible dielectric material and having a concave upper surface and an opposite lower surface. According to another aspect, a meta-network model is created for networks by accounting for the occurrence of network models that are found in multiple networks in a manner that reduces the redundancy across networks and that increases the specificity of the network model score. Another form of stud has a discontinuous webs defining spaces between them. The controller in turn, based on the calculated VAR, increments the time, either increasing or decreasing it from a predetermined value, during which the SSRs in that line remains in the non-conducting state.