@Article{bonmassar1998:representation,
  author =       {Giorgio Bonmassar and Eric L. Schwartz},
  title =        {Representation is space-variant},
  journal =      {Behavioral and Brain Sciences},
  year =         1998,
  volume =       21,
  number =       4,
  pages =        {469-470},
  month =        Aug,
  datestr =      199808,
  note =         {Commentary on S. Edelman, {\it Representation is
                  representation of similarities}},
  PMID =         10097019,
  abstract =     {Under shift, caused for example by eye movement, or
                  by relative movement of the subject or object of
                  perception, the cortical representation undergoes
                  very large changes in ``size'' and ``shape''.
                  Space-variance of cortical representation rules out
                  models which fundamentally require linear
                  interpolation between shifted patterns (e.g. Shimon
                  Edleman's model), or rigid shift of an invariant
                  retinal stimulus corresponding to shift at the
                  cortex (e.g. the shifter theory of VanEssen).
                  Recently, a computational solution to
                  ``quasi-shift'' invariance for spacevariant mappings
                  has been constructed [Bonmassar and Schwartz, 1997a,
                  Bonmassar and Schwartz, 1997b].},
}