Figure 2. A demixing problem: two rotated Laplace directions.

(A) Evolution of the weights ( in blue, in red) for different initial conditions, with , and weight normalization. (B) Evolution of the instantaneous firing rate , sampled each 1000 ms, for the initial weights , . (C) Corresponding changes in transfer function parameters, with in Hz and and in mV. (D) Final weight vector for different rotation angles (in red). In the first example, normalization was done by (the estimated rotation angle is , instead of the actual value 0.5236); for the others was used. In all cases the final weight vector was scaled by a factor of 5, to improve visibility.