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Fig. 15.9. Orientation maps in LISSOM and GLISSOM. Above the minimum 36 × 36 initial network size, the final GLISSOM maps closely match those of LISSOM, yet take much less time and memory to simulate. Computation time increases smoothly as larger initial networks are used, allowing a tradeoff between accuracy and time. However, accurate maps are obtained substantially faster than with LISSOM. As long as the initial networks are small compared with the final maps, memory usage is bounded by the size of the final maps.