[Eeglablist] Understanding topoplot

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Thu Feb 27 22:36:44 PST 2014


Dear Joaquin,

Further adding to Mikolaj's reply- today I published a new plugin
pvaftopo(), which needed three lines only:

backProj =
EEG.icawinv(:,IC)*eeg_getdatact(EEG,'component',IC,'reshape','2d');
outTopo  = 100-100*var(EEG.data(:,:)-backProj,0,2)./var(EEG.data(:,:),0,2);
topoplot(outTopo, EEG.chanlocs);

With this plugin, you can demonstrate IC3 and IC9 together explain 78% of
Fz activity, for example. Note that topoplot() is used in the last line.
Here outTopo is a column vector that corresponds to the number of channels.

Check out the pvaftopo from plugin manager or url below.
http://sccn.ucsd.edu/wiki/Plugin_list_process

Sorejamata,
Makoto Miyakoshi


2014-02-27 14:03 GMT-08:00 Mikołaj Magnuski <imponderabilion at gmail.com>:

> Hi,
>
> just to add to Stephen's answer - you can plot anything with topoplot
> (p-values, correlation coefficients,
> mean spectral power etc.) - topoplot plots and interpolates given values,
> whatever these
> values are. The order of electrode-value pairings is determined by
> EEG.chanlocs
> (this structure can be passed to topoplot).
>
>
> Pozdrawiam,
> Mikołaj Magnuski
>
>
> 2014-02-27 19:54 GMT+01:00 Stephen Politzer-Ahles <
> politzerahless at gmail.com>:
>
> Hi Joaquin,
>>
>> topoplot() is plotting the activity at a certain time (or an average over
>> a certain time window) at all channels, and interpolated between channels.
>> I've never used it to plot activity restricted to a certain frequency,
>> although in principle I guess that is possible; I've only used it to plot
>> the raw ERP amplitudes, though.
>>
>> Best,
>> Steve
>>
>>
>>
>> Stephen Politzer-Ahles
>> New York University, Abu Dhabi
>> Neuroscience of Language Lab
>> http://www.nyu.edu/projects/politzer-ahles/
>>
>>
>> On Thu, Feb 27, 2014 at 2:51 PM, joaquin .cuomo <jmcuomo at gmail.com>wrote:
>>
>>> Hi,
>>>
>>> I´m not fully sure if I´m understanding how topoplot() works.
>>>
>>> First I thought that it was plotting the interpolation of all channel
>>> spectrums at a given frequency, but then I found spectopo(), which I have
>>> not yet tested it, but seems to do what I supposed topoplot was doing.
>>>
>>> I can´t understand what is topoplot plotting, *because if neither a
>>> frequency nor time is fixed *it can not be plot.
>>>
>>> Please someone clarify my thoughts.
>>>
>>> Thanks!
>>>
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>>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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