Table 2. Summary of results for modifications to the plasticity rules described in Equation 1.

Homeostatic Scaling	Potentiation bias	Depression bias
rSTDP	Stable but not diverse/EW	Stable and diverse/C, WTS, EW
cSTDP	Unstable/EW	Unstable/EW
Multiplicative Scaling	Potentiation bias	Depression bias
rSTDP	Unstable/WTS,	Stable but not diverse/WTS
cSTDP	Unstable/WTS	Unstable/WTS
Concurrent changes in Q	Potentiation bias	Depression bias
rSTDP	Unstable/EW	Stable/C
cSTDP	Unstable/EW	Unstable/EW

We considered three modifications: Homeostatic scaling, Multiplicative scaling and concurrent changes in the bottom-up and top-down weights (see text for a description of these modified rules). The first line in each entry of the table describes the results of the numeric implementation of the analytical work (based on Equation A22). The second line of each entry describes the results of the Integrate and Fire simulations, by listing all the different outcomes seen for a particular modification. C = “Converged”, WTS = “Weights too similar”, EW = “Extreme Weights” (see main text and Methods for a quantitative definition of each of these categories).