Single Trial Spectrum Analysis

This analysis captures the frequency content of continuous variables for a single trial.

Parameters

Parameter	Description
Reference	Specifies a reference neuron or event.
XMin	Time window minimum in seconds.
XMax	Time window maximum in seconds
Ref. Timestamp Number	Reference timestamp number.
Number of Fr. Values	Number of values in the spectrum.
Window Overlap (%)	Window overlap in percent (from 0 to 90).
Window Preprocessing	Preprocessing to be done for each window before calculating the spectrum of the window.
Windowing Function	Windowing Function to be applied to each window before calculating the spectrum of the window.
Discard Incomplete Windows	Option to discard the last window if it contains less than the expected number of data points (less than NumberOfFrValues*2 points).
Use Multitaper Algorithm	Option to use multi-taper algorithm.
Time-Bandwidth Product	Time-Bandwidth Product when using multi-taper algorithm.
Number of Tapers	Number of Tapers when using multi-taper algorithm.
Show Frequency From	Minimum frequency to be shown in the spectrum graph.
Show Frequency To	Maximum frequency to be shown in the spectrum graph.
Normalization	Spectrum normalization. See Algorithm below.
Log Frequency Scale	An option show Log10 frequency scale.
Smooth	Option to smooth the spectrum after the calculation. See Post-Processing Options for details.
Smooth Filter Width	The width of the smooth filter. See Post-Processing Options for details.
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.
Add Freq. Values to Results	An option to add an additional vector of frequency values to the matrix of numerical results.
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.
YMin	Spectrum minimum.
YMax	Spectrum maximum.
Filter Length	The length of all the intervals of the interval filter (if a filter was used) or the length or the recording session (in seconds).
Number of FFT windows	Number of FFT windows used in analysis.
Frequency of Minimum	The position of the minimum of the displayed spectrum (in Hz). If there are multiple bins in the spectrum where the spectrum value is equal to the spectrum minimum, this value represents the frequency of the first such bin.
Frequency of Maximum	The position of the maximum of the displayed spectrum (in Hz). If there are multiple bins in the spectrum where the spectrum value is equal to the spectrum maximum, this value represents the frequency of the first such bin.

Algorithm

For each selected continuous variable, a standard or multi-taper power spectrum is calculated. See Power Spectral Densities for Continuous Variables for details.