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This article will explain in detail the example analysis of data superposition average in eeglab. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

ERP is the abbreviation of Event-related Potentials, event-related potential, is a special brain evoked potential, by intentionally giving special psychological meaning to the stimulation, the use of multiple or multiple stimuli caused by the brain potential.

1. Draw ERP data in scalp maps uniaxially

In this step, we will plot the superimposed average (ERP) of all epochs and the ERP scalp maps for a particular latency.

To perform this step correctly, the steps that must be taken are:

Load data file

Load location file

Extract data epoch

After completing the above steps, do the following:

Plot > Channel ERPs > With scalp maps, the following dialog box pops up:

If the above dialog box pops up, it is successful, otherwise it means that the operation has gone wrong.

If something goes wrong, please re-operate correctly according to the prompts.

After the correct dialog box above pops up, click OK. The timtopo.m diagram pops up (below).

In the result of the above figure, each curve corresponds to each channel, and the topographic map above is the average voltage topographic map distribution of the 430ms time (when we use the default value, eeglab will default to draw the topographic map of the moment of ERP variance maximum, in this case 430ms).

two。 Draw ERP tracks (Plotting ERP traces in a topographic array) in the terrain array

Here we want to draw the ERP of each channel according to the scalp distribution of each channel.

Specific operation: Plot > Channel ERPs > In scalp array/rect. Array . The following dialog box appears.

In the above dialog box, using the default settings and clicking "OK", the following interface pops up (plottopo.m)

Note that the option to call the function geom on the command line can also be used to draw channel waveforms in a rectangular grid. In the figure above, double-click any channel to draw an ERP subgraph of the corresponding channel.

3. Draw an ERP diagram of a two-column array

To draw (one or more) average ERP data tracks in a two-column array. The specific operations are as follows:

Plot > Channel ERPs > In scalp/rect. Array, the following dialog box pops up:

In the image above, select Plot in rect. Array, as shown in the red box. Then click "OK" and the following interface pops up:

As in the previous figure, double-clicking the track in the interface pops up a complete child window (two pops up here) to show the ERP of the corresponding channel.

This is the end of this article on "sample Analysis of data superimposed averaging in eeglab". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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