Multichannel Systems NeuroExplorer - Manual (Page 104)

With Firing Rates display, if the animal spent less time in the cell than Min Time Spent or visited the
cell less than Min Visits number of times, the firing rate for the cell is set to zero. Otherwise the
number of times the neuron fired in this cell is divided by the time the animal spent in the cell
producing the firing rate for the cell.
Firing Field a set of at least Min. Pixels in Field contiguous cells where each cell in the field shared at
least one side with another cell in the field and each cell had a firing rate greater than (Session_mean
+ Min Std. Dev. in Field * Session_st_dev), where Session_mean is the firing rate of the complete
recording session, Session_st_dev is the standard deviation of the mean firing rate. Session_mean
and Session_st_dev are calculated the following way: the recording session is divided into time bins
of size Firing Rate Bin. For each bin i, neuron firing rate R[i] is calculated. Session_mean is the
mean of array R[i], Session_st_dev is the standard deviation of array R[i].
Centroid of field location is the arithmetic mean center of a firing field's spatial firing rate distribution
determined after the coordinates of each cell in the field was multiplied by the firing rate in the cell.
Coherence measures the local smoothness of the firing rate distribution in the field. It is the Pearson
correlation of the firing rate in each cell with the firing rate averaged over the cell and its 8 nearest
neighbors.
Reference
A. Fentona, Gyorgy Csizmadiab, and Robert U. Muller. Conjoint Control of Hippocampal Place Cell
Firing by Two Visual Stimuli I. The Effects of Moving the Stimuli on Firing Field Positions. The Journal
of General Physiology, Volume 116, Number 2, August 1, 2000 191-210.
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