| POP_SPECTOPO |
Plot spectra of specified data channels or components. Show scalp maps of power at specified frequencies. Calls spectopo(). |
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| Usage: |
>> pop_spectopo( EEG, dataflag); % pops-up interactive window
OR
>> [spectopo_outputs] = pop_spectopo( EEG, dataflag, timerange, process, 'key', 'val',...); % returns spectopo() outputs |
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| Graphic interface for EEG data (dataflag = 1): |
"Epoch time range" |
[edit box] [min max] Epoch time range (in ms) to use in computing the spectra (by default the whole epoch or data). Command line equivalent: 'timerange' |
"Percent data to sample" |
[edit box] Percentage of data to use in computing the spectra (low % speeds up the computation). spectopo() equivalent: 'percent' |
"Frequencies to plot as scalp maps" |
[edit box] Vector of 1-7 frequencies to plot topoplot() scalp maps of power at all channels. spectopo() equivalent: 'freqs' |
"Apply to EEG|ERP|BOTH" |
[edit box] Plot spectra of the 'EEG', 'ERP' or of 'BOTH'. |
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| NOTE: |
This edit box does not appear for continuous data.
Command line equivalent: 'process' |
"Plotting frequency range" |
[edit box] [min max] Frequency range (in Hz) to plot. spectopo() equivalent: 'freqrange' |
"Spectral and scalp map options (see topoplot)" |
[edit box] 'key','val','key',... sequence of arguments passed to spectopo() for details of the spectral decomposition or to topoplot() to adjust details of the scalp maps. For details see >> help topoplot |
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| Graphic interface for components (dataflag = 0): |
"Epoch time range" |
[edit box] [min max] Epoch time range (in ms) to use in computing the spectra (by default the whole epoch or data). Command line equivalent: 'timerange' |
"Frequency (Hz) to analyze" |
[edit box] Single frequency (Hz) at which to plot component contributions. spectopo() equivalent: 'freqs' |
"Electrode number to analyze" |
[edit box] 1-nchans --> Plot component contributions at this channel; [] --> Plot contributions at channel with max power; 0 --> Plot component contributions to global (RMS) power. spectopo() equivalent: 'plotchan' |
"Percent data to sample" |
[edit box] Percent of data to use in computing the spectra (low % speeds up the computation). spectopo() equivalent: 'percent' |
"Components to include ..." |
[Edit box] Only compute spectrum of a subset of the components. spectopo() equivalent: 'icacomps' |
"Number of largest-contributing ..." |
[edit box] Number of component maps to plot. spectopo() equivalent: 'nicamaps' |
"Else, map only these components ..." |
[edit box] Use this entry to override plotting maps of the components that project most strongly (at the selected frequency) to the the selected channel (or whole scalp if 'plotchan' (above) == 0). spectopo() equivalent: 'icamaps' |
"[Checked] Compute comp spectra ..." |
[checkbox] If checked, compute the spectra of the selected component activations; else, if unchecked compute the spectra of (the data MINUS each selected component). spectopo() equivalent: 'icamode' |
"Plotting frequency range" |
[edit box] [min max] Frequency range (in Hz) to plot. spectopo() equivalent: 'freqrange' |
"Spectral and scalp map options (see topoplot)" |
[edit box] 'key','val','key',... sequence of arguments passed to spectopo() for details of the spectral decomposition or to topoplot() to adjust details of the scalp maps. For details see >> help topoplot |
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| Inputs: |
EEG |
Input EEGLAB dataset |
dataflag |
If 1, process the input data channels. If 0, process its component activations. {Default: 1, process the data channels}. |
timerange |
[min_ms max_ms] Epoch time range to use in computing the spectra {Default: whole input epochs} |
process |
'EEG'|ERP'|'BOTH' If processing data epochs, work on either the mean single-trial 'EEG' spectra, the spectrum of the trial-average 'ERP', or plot 'BOTH' the EEG and ERP spectra. {Default: 'EEG'} |
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| Optional inputs: |
'key','val' |
Optional topoplot() and/or spectopo() plotting arguments {Default, 'electrodes','off'} |
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| Outputs: |
As from spectopo(). When nargin<2, a query window pops-up
to ask for additional arguments and NO outputs are returned. |
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| Note: |
Only the outputs of the 'ERP' spectral analysis
are returned when plotting 'BOTH' ERP and EEG spectra. |
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| Author: |
Arnaud Delorme & Scott Makeig, CNL / Salk Institute, 10 March 2002 |
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| See also: |
spectopo(), topoplot() |