Shulou(Shulou.com)06/01 Report--

This article mainly shows you "how to draw ERP images in eeglab", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "how to draw ERP images in eeglab" this article.

Draw ERP ima

Eeglab has a function to draw ERP image, which can have a better understanding of the ERP effect. This ERP image is a 2merD image, where the horizontal axis is the time value of each epoch, the vertical axis is the number of each epoch, and each point in the image represents the voltage value of the corresponding epoch at the corresponding time. As for the order of the epoch on the vertical axis, the eeglab is sorted by default in the order in which they appear in the experiment. Researchers can reorder the vertical order of each epoch according to their own interests (for example, according to subject reaction time, alpha-phase at stimulus onset) theoretically, there can be many ways to sort them. Of course, the information that each sort can provide is different, so you need to make a specific choice according to your own research.

1. Using pop_erimage () to draw ERP Image

Specific operation: Plot > Channel ERP image, enter channel 27 in this interface, and enter smoothing 1 (which represents the value taken during the smooth drawing of the nearby epochs), and click "OK".

After clicking "OK", the following interface pops up:

The top part in the picture is the scalp position of the electrode, the middle part is the ERP diagram, and the lower part is the ERP of the electrode.

two。 Draw a smooth ERP

Call the pop_erpimage.m interactive window and set the smoothing width to 10. The above results can better show the oscillation activity of α-band.

Note: [because there are a large number of options available, the last called parameter (if any) will be called as the default value (although the optional parameter entered through the text box is not). If you encounter problems with this feature, you can type > > eegh (0) on the Matlab command line to clear the history.]

3. Sort the trial of ERP image

The eeglab is arranged by default in the order in which the trial appears during the experiment. On the pop_erpimage.m interface, click the Epoch-sorting field button and select Latency, and click Event type to select rt. And enter-200800 ms in Event time range.

Click "OK" in the above picture, and the following interface pops up:

On the pop_erpimage.m interface, click the Epoch-sorting field button and select Latency, and click Event type to select rt. And enter-200800 ms in Event time range. Align is set to inf

Click "OK" and the following result pops up:

These are all the contents of the article "how to draw ERP Images in eeglab". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.