Fig. 3

The distributions of the PDs of neuronal ensembles. Each orange or black line shows the PD of each neuron in the angular space. The orange lines denote well-tune neuron whereas the black lines denote poorly tuned neurons. The PDs of sixty neurons are displayed. (First row) Examples of the PD distributions with uniformity of 50%. Note that the PD distribution covers half of the angular space. The numbers on top indicates a bias (in degree) that is the central direction of the group of PDs. (Second—last rows) Representative examples of PD distributions of a mixture of well-tuned neurons (orange lines) and poorly tuned neurons (black lines) with various proportions of the well-tuned neurons (P) and the uniformity of these well-tuned neurons (U). Poorly tuned neurons are assumed to be uniformly distributed. P increases from the second to the last rows. U increases from the first to last columns