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This article will explain in detail how to select the epochs of data in eeglab and compare it. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

Select the data epoch and draw the data average

In order to compare the ERP of a subject under two conditions, it is necessary to first create a dataset for each of the two conditions. In this experiment, half of the target stimuli are present at position 1 and half of the target stimuli are at position 2.

Selecting Events and Epochs for Two Conditions.

Operation: Edit > Select epochs or events, and the following interface pop_selectevent.m appears. Enter "1" in the text box next to the position, which selects all epoch whose target appears in location 1.

After clicking "OK", the following pop_newset.m window appears to save the new dataset. Here, name the new dataset "Square,Pos1", and then click "OK".

Repeat the above to create another dataset named "Square, Pos.2".

Another way to select a dataset: Edit > Select data, the following example selects data subperiods with a time range of-500ms to 1000 milliseconds. In addition, it will delete dataset epoch 2, 3, and 4, and completely delete channel 31.]

Computing Grand Mean ERPs

Operate Plot > Sum/Compare ERPs to pop up the following window, and enter the indexes of datasets "3" and "4" at the top of the pop-up pop_comperp.m window. Click avg on the first row, display the mean, click std to show the standard deviation, all ERP boxes show the average ERP of each data set, the significance probability threshold of t-test is 0.05, click "OK".

After clicking "OK", the following interface appears:

Click the trace on the electrode position FPz on the above interface to pop up the following image

Comparing ERPs in Two Conditions

Comparison of ERPs under two conditions

Specific operation: Plot > Sum/Compare ERPs, enter the index of the dataset to be compared in the text input box at the top of the pop-up pop_comperp.m window, click all the boxes in the average, enter 30 in the low-pass frequency, and in

Double-click the channel on the interface (double-click FPz) to pop up the following interface:

This is the end of the article on "how to choose the epochs of data in eeglab and compare it". 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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