Multichannel-systems NeuroExplorer Manual do Utilizador descarregar pdf (Página 113)

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 Post-Processing

Options for details.

Smooth Filter Width The width of the smooth filter. See Post-Processing Options 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

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.

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