Hh style channels for spiking retinal ganglion cells, modified from fohlmeister et al. (1990), by tj velte 1995, must be used with capump. Model from fohlmeister & miller (1997), model no. 3673, spike.mod file, with no changes (identical mod files). Modeling study, based on several previous studies. Animal model is considered generic vertebrate as stated in paper, though much of the previous data comes from tiger salamander. This channel's kinetics are from tiger salamander (fohlmeister and miller 1997).