Parallel Computational Subunits in Dentate Granule Cells Generate Multiple Place Fields
Figure 5
Moderate number of branches allows the isolation of subunits and the detection of dendritic spikes.
(A) The joint distribution of the somatic activation as and the maximal dendritic input U*. As the number of branches grow (from left to right), the somatic depolarization caused by a dendritic spike in a single compartment decreases gradually. Consequently, if N is high, than the somatic threshold (horizontal line) can not separate small and large dendritic events. (B) The probability of detecting a dendritic spike decreases as the number of dendritic subunits increases. Different colors indicate different degrees of nonlinearity (blue circles: quadratic; black triangles: linear integration function). (C) The joint distribution of the activation of a dendritic branch and its own input Ui. Increasing the number of compartments decrease the variance of the distribution and the impact of other branches. (D) The external influence decreases with the number of branches both with linear (triangles) and quadratic (circles) integration function. R = 0.3.