> What exactly is the "bottom" in a bottom-up approach? Great question (to which I have no idea what the answer is). It seems to me that the various attempts a

> What exactly is the "bottom" in a bottom-up approach? Great question (to which I have no idea what the answer is). It seems to me that the various attempts are trying to simulate sets of emergent behaviours at different levels of the brain's "stack". I guess, one way of determining the success of a "lower level" simulation/emulation, is the emergence of known "higher level" behaviours?