Multichannel Systems NeuroExplorer - Manual (Page 66)

2.12. Crosscorrelograms
Crosscorrelogram shows the conditional probability of a spike at time t0+t on the condition that there
is a reference event at time t0.
Compared to PSTH (that calculates the same probabilities), crosscorrelogram allows to use shift-
predictors.
Parameters
Parameter Description
Reference Type Specifies if the analysis will use a single or multiple reference events.
Reference Specifies a reference neuron or event (or a group of reference neurons or
events).
XMin Histogram time axis minimum in seconds.
XMax Histogram time axis maximum in seconds
Bin Bin size in seconds.
Normalization Histogram units (Counts/Bin, Probability, Spikes/Second or Z-score). See
Algorithm below.
No Selfcount An option not to count reference events if the target event is the same as
the reference event (prevents a histogram to have a huge peak at zero
when calculating crosscorrelogram versus itself).
Select Data If Select Data is From Time Range, only the data from the specified (by
Select Data From and Select Data To parameters) time range will be used
in analysis. See also
Data Selection Options .
Select Data From Start of the time range in seconds.
Select Data To End of the time range in seconds.
Int. filter type Specifies if the analysis will use a single or multiple interval filters.
Interval filter Specifies the interval filter(s) that will be used to preselect data before
analysis. See also
Data Selection Options .
Count bins in filter An option to normalize each bin individually if the interval filter is used. See
Algorithm section below for detailed discussion.
Create filter on-the-fly Specifies if a temporary interval filter needs to be created (and used to
preselect data).
Create filter around Specifies an event that will be used to create a temporary filter.
Start offset Offset (in seconds, relative to the event specified in Create filter around
parameter) for the start of interval for the temporary filter.
End offset Offset (in seconds, relative to the event specified in Create filter around
parameter) for the end of interval for the temporary filter.
Fix overlaps An option to automatically merge the overlapping intervals in the temporary
filter.
Overlay Graphs An option to draw several histograms in each graph. This option requires
that Int. filter type specifies that multiple interval filters will be used (either
Table (row) or Table (col)).
Overlay Options Specifies line colors and line styles for overlaid graphs.
Page 64