Ok, how about 6 different neuron *classes*?

[William Calvin]

Classifications of neurons by functional emphasis have been attempted by
various people over the years.  See chapter 29 "Styles of Neuronal
Computation" by W. H. Calvin and K. Graubard in THE NEUROSCIENCES FOURTH
STUDY PROGRAM (MIT Press 1979).

    William H. Calvin   WCalvin at U.Washington.edu
    University of Washington  NJ-15
    Seattle, Washington 98195 FAX:1-206-720-1989