Spectrogram analysis – Multichannel Systems NeuroExplorer User Manual
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2.33. Spectrogram Analysis
This analysis captures the frequency content of continuous variables or neuronal rate histograms.
Parameters
Parameter
Description
Max. Freq.
Maximum frequency for the spectrograms. If at least one continuous
variable is selected, the value of the Maximum Frequency parameter is set
as 0.5*Digitizing frequency of the first selected continuous variable. All
continuous variables selected for this analysis should have the same
digitizing rate.
Number of Fr. Values
Number of frequency values.
Normalization
Spectrum units (Raw PSD (Power Spectral Density), Log of PSD).
Start
Start of the first window.
Shift
How much sliding window is shifted each time.
Number of Shifts
total number of sliding windows.
Show Freq. From
An option to show a subset of frequencies. Specifies minimum frequency
to be displayed.
Show Freq. To
An option to show a subset of frequencies. Specifies maximum frequency
to be displayed.
X Axis
Allows to specify what values are shown in the sliding window X axis.
There are two options: Start of Window and Center of Window.
Suppose your data has the strongest spectral value at 50 seconds. This
means that the window that has 50 seconds as its center will show the
highest spectrum values. If the window width is 20 seconds, it will be the
window [40,60]. If you are using 'Start of window' option, you will see the
peak at 40 instead of 50 seconds. However, with 'Center of window' option,
the peak will be at 50 seconds.
Smooth
Option to smooth the spectrum after the calculation. See
for details.
Smooth Filter Width
The width of the smooth filter. See
for details.
Add to Results / Bin left An option to add an additional vector (containing a left edge of each
frequency bin) to the matrix of numerical results.
Add to Results / Bin
middle
An option to add an additional vector (containing a center of each
frequency bin) to the matrix of numerical results.
Add to Results / Bin
right
An option to add an additional vector (containing a right edge of each
frequency bin) to the matrix of numerical results.
Send to Matlab
An option to send the matrix of numerical results to Matlab. See also
.
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
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