Fig. 4.

Dependence of coding space and correlation on connectivity and the role of thresholding in controlling the expansion and decorrelation. a Normalized total variance and b log normalized population correlation for networks of linear granule cells (i.e. in the absence of a threshold). Correlation radius is σ = 20 μm. c Top: robustness of expansion (green) and decorrelation (purple) for varying levels of granule cell (GC) threshold. Dotted line indicates the experimentally estimated value of threshold (3 of the 4 mossy fibers, MFs). Bottom: Robustness of learning for varying GC threshold