Figure 6.

Selecting maximal simplexes via the pairwise coactivity threshold (Method I). (A) The appearance rates of the maximal simplexes computed for four different pairwise appearance rate thresholds θ decrease as a function of their dimensionality. The values at D = 1 correspond to the value of the threshold imposed on the links' appearance rate. (B) Cumulative distribution of the numbers of maximal simplexes, N_max, over the selected simplexes' dimension. The numbers of cells N_c for each threshold value are shown by horizontal lines. The tendency of the maximal simplexes to outnumber the vertexes N_max > N_c, characteristic for small values of θ, is reversed around θ = 0.07 Hz, where N_max and N_c level out. (C) The histograms of the maximal simplexes' dimensionalities fit with normal distribution. The mean dimensionalities are similar to the ones produced by the previous selection method. The width of the distributions is about 50% of $\stackrel{-}{D}$. (D) The histogram of the number of coactive maximal simplexes, fit to an exponential distribution, shows that the expected number of coactive simplexes (β ~ 4) is significantly lower than in the previous selection method. The procedure of averaging over the place field maps is the same.