Divisive issue 1:
Level of biological match

·   Marrian 3-level perspective:

- `computational theory': what & why
- representation & algorithm
- hardware implementation

·   All systems try for `what' (organization)

·   Debate over representation, algorithm

- spectrum? filterbank? nonlinear?
- firings? probabilities?
- grouping??

·   Emergent syste,s `derive' algorithm from implementation (Malsburg, Brown/Wang)

- e.g. neural oscillator grouping


Advantages:	Disadvantages:
· parsimonious	· just mimicry
· plausible	· inflexible