Estimating neuronal firing density: A quantitative analysis of firing rate map algorithms
Fig 3
Adaptive smoothing, pixelwise method.
See Methods: Adaptive smoothing for more detail. Schematic showing the steps involved with creating a firing rate map using the adaptive smoothing approach described by Skaggs and McNaughton [42]. A set of query points are specified, these typically form a square grid spanning the data. A circle is expanded around each point until the contents satisfy the adaptive equation (bottom of figure). The radius needed to satisfy the adaptive equation is shown for two query points. The value of the firing rate map at each query point is then equal to the number of spikes divided by the number of position samples within that circle multiplied by the sampling interval of the position data.