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Evaluation of the Oscillatory Interference Model of Grid Cell Firing through Analysis and Measured Period Variance of Some Biological Oscillators

Figure 3

Coding 2D angular position.

Positions on a plane are coded using two phase differences (black and gray bands on left, arrows at right). A. The gray VCO's preferred direction is up-down, the black VCO's preferred direction is at an angle of to the gray VCO. A band occurs where the phase difference of one VCO is near 0. A field (white outline at white star) occurs where all the bands intersect (i.e. where all phase differences are near 0). Arrows indicate the preferred directions of the two VCOs ( and ) as well as the perpendicular directions along which the bands extend ( and ). B. The phase differences corresponding to four locations indicated by stars are illustrated. Instead of showing phase of the oscillators, the arrows indicate the phase difference between a VCO and the baseline oscillator. The cell can be thought of as firing when both phase differences are sufficiently near zero (threshold indicated by the horizontal line).

doi: https://doi.org/10.1371/journal.pcbi.1000573.g003