A few days ago I advertised a preprint entitled "Optimizing cortical mappings" by Goodhill, Finch and Sejnowski. Unfortunately since then the ftp and http details have changed. The new ones are ftp://ftp.cnl.salk.edu/pub/geoff/goodhill_nips96.ps.Z and http://www.cnl.salk.edu/~geoff Apologies, Geoff Goodhill