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Mean positional errors 〈δr〉 (± S.D.) in path integration (PI) with respect to number of neurons per layer averaged over 1, 000 trials for three different sensory noise level (0, 2, and 5%). In all three cases, the error reaches a minimum plateau between 16 and 32 neurons (colored area), which corresponds to the number of functional columns in the ellipsoid body of the insect central complex (Wolff et al., 2015).
