About labeling the samples

Dalia_Mirghani

I am working on a motor imagery project, I used an Ultracortex Mark IV EEG headset-8 Channels with Syton board to record the EEG signals.
My recording session scenario sequentially is 60 sec relax with closed eyes, the next 35 sec an imagination of right-hand movement, then 10 sec rest, then 35 sec an imagination of left-hand movement, and the last 10 sec relax with closed eyes.
How can I add a label for each period?
Is it possible to add the labels during the recording session or shall I add them manually in the RAW data sheet, and how to do both?
could you help, please?

wjcroft

"External Trigger" is what you want.

https://docs.openbci.com/Cyton/CytonExternal/

Dalia_Mirghani

Thank you for your answer.
I went to the specified page, but unfortunately, I did not understand anything from it!!
Is there any way to get more details?

wjcroft

@Dalia_Mirghani said:
Thank you for your answer.
I went to the specified page, but unfortunately, I did not understand anything from it!!

What specifically are you not understanding? With the 8 EEG channel amplitude values that are collected with each sample, there are THREE ADDITIONAL 'Aux' sample values that can be used for external timing synchronization information. These are recorded simultaneously with each sample value.

You can wire external timing sources to these Aux pins to record the state or 'label' information you desire to be correlated with the samples.

Dalia_Mirghani

@wjcroft said:

@Dalia_Mirghani said:
Thank you for your answer.
I went to the specified page, but unfortunately, I did not understand anything from it!!

What specifically are you not understanding? With the 8 EEG channel amplitude values that are collected with each sample, there are THREE ADDITIONAL 'Aux' sample values that can be used for external timing synchronization information. These are recorded simultaneously with each sample value.

You can wire external timing sources to these Aux pins to record the state or 'label' information you desire to be correlated with the samples.

Thank you again.
I opened the "Digital Read" Layout and got the 5th-colored digital pins, but nothing happened when attempted to press any one of them, and no "PROG" button is found anywhere in my GUI. And this setting option did not even appear in the previously recorded data.

I will read and ask more about ''Aux pins'' regarding my future trials, but the crucial point now is to know how I can add labels to my previously recorded data.
If you can help me with this issue I will be very thankful.

wjcroft

@Dalia_Mirghani said:
...
Thank you again.
I opened the "Digital Read" Layout and got the 5th-colored digital pins, but nothing happened when attempted to press any one of them, and no "PROG" button is found anywhere in my GUI. And this setting option did not even appear in the previously recorded data.

PROG refers to the BUTTON on the Cyton board. The Digital Read widget is READING these values from Cyton, it does not do 'output' or other things with the icons in the widget. Be careful with the Cyton buttons, ONLY press the PROG not other buttons. You should see the widget pin light up when pressed.

I will read and ask more about ''Aux pins'' regarding my future trials, but the crucial point now is to know how I can add labels to my previously recorded data.

If you want to label previously recorded data, you could use any of the various 'editing' programs that can input CSV format. Such as EDFBrowser. I believe EEGLAB can do this also with 'events'.

https://www.teuniz.net/edfbrowser/
https://www.google.com/search?q=eeglab+markers

Dalia_Mirghani

Thank you so much.