Perievent Rasters for Continuous

This analysis shows the traces of the selected continuous variable relative to the timestamps of the reference variable.

Parameters

Parameter	Description
Reference	Specifies a reference neuron or event.
XMin	Time axis minimum in seconds.
XMax	Time axis maximum in seconds
Use last ref. event	An option to draw the trace only for the last reference event.
Round ref. timestamp	An option to align reference event timestamps to the timestamps of the continuous variable. This option is valid only if XMin <0 and XMax >0.
Draw Variation	An option to draw variation around the mean as a colored background.
Variation (standard deviations)	Number of standard deviations in the colored background around the mean.
Variation Background Color	The color to be used for drawing of the colored background around the mean.
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.
Interval filter	Specifies the interval filter that will be used to preselect data before analysis. See also Data Selection Options.
Send to Matlab	An option to send the matrix of numerical results to Matlab. See also Matlab Options.
Matrix Name	Specifies the name of the results matrix in Matlab workspace.
Matlab command	Specifies a Matlab command that is executed after the numerical results are sent to Matlab.
Send to Excel	An option to send numerical results or summary of numerical results to Excel. See also Excel Options.
Sheet Name	The name of the worksheet in Excel where to copy the numerical results.
TopLeft	Specifies the Excel cell where the results are copied. Should be in the form CR where C is Excel column name, R is the row number. For example, A1 is the top-left cell in the worksheet.

Summary of Numerical Results

The following information is available in the Summary of Numerical Results

Column	Description
Variable	Variable name.
Reference	Reference variable name.
NumRefEvents	The number of reference events used in calculation
YMin	Minimum of the average trace shown at the bottom.
YMax	Minimum of the average trace shown at the bottom.

Algorithm

Let ref[i] be the array of timestamps of the reference event.

For each timestamp ref[k], NeuroExplorer draws the values of continuous variable with timestamps from ref[k] + XMin to ref[k] + XMax. The timestamps of the continuous variables are shown relative to the ref[k]: if the timestamp of continuous variable data point is cont_ts[i], the timestamp shown in Numerical Results is relative_ts[i] = cont_ts[i] - ref[k].

If Round ref. timestamp option is used, NeuroExplorer shifts the relative timestamps of the continuous variable. The program finds the last timestamp cont_ts[j] of the continuous variable before ref[k]. Then, the program adjusts the relative timestamps of the continuous variable so that

relative_ts_adjusted[j] = ref[k]

If diff = ref[k] - cont_ts[j] then relative_ts_adjusted[i] = relative_ts[i] + diff.

Mean values of the perievent raster shown at the bottom graph are calculated using linear interpolation.