Difference between revisions of "NE Tutorials"
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For visualization, you can also choose a reference electrode in NIC: another electrode, or the average of the other used electrodes. These settings in NIC only affect visualization, not the recorded data. | For visualization, you can also choose a reference electrode in NIC: another electrode, or the average of the other used electrodes. These settings in NIC only affect visualization, not the recorded data. | ||
| − | Once your data is saved on a file, you can always digitally (re)-reference the data. Mathematically, this means that you will subtract the measurement of an electrode or the average of some electrodes to all the electrode set. | + | Once your data is saved on a file, you can always digitally (re)-reference the data. Mathematically, this means that you will subtract the measurement of an electrode or the average of some electrodes to all the electrode set. This is very advisable, as it will remove common noise from your data. |
| + | |||
| + | Note that EEG measures voltages, and, physically, they are only defined up to a constant. In a sense, which reference you use should not be critical to your analysis. | ||
==Visualizing EEG signals in real time== | ==Visualizing EEG signals in real time== | ||
Revision as of 21:24, 20 November 2013
In this page we will soon provide a variety of tutorials. Enjoy and send us feedback!
EEG tutorials
How to record EEG
Referencing your EEG data
In the first place, you should place carefully the CMS and DRL electrodes. They provide a basic electrical reference to the system. These two electrodes should go over the left or right mastoid (best to always stick to one side). First clean up the mastoid area where you are going to attach the DRL/CMS electrodes (using Sticktrode adhesive electrodes). You can use a paper napkin with some water or alcohol. Removing grease and dry skin will help you get good signal. Stick the DRL/CMS electrodes close to each other, with the DRL on the bottom. These two Sticktrode electrodes should be close to each other but not touch. The CMS electrode should be on top and squarely on top of the mastoid bone. This will avoid contamination from blood vessels (ECG like signals).
For visualization, you can also choose a reference electrode in NIC: another electrode, or the average of the other used electrodes. These settings in NIC only affect visualization, not the recorded data.
Once your data is saved on a file, you can always digitally (re)-reference the data. Mathematically, this means that you will subtract the measurement of an electrode or the average of some electrodes to all the electrode set. This is very advisable, as it will remove common noise from your data.
Note that EEG measures voltages, and, physically, they are only defined up to a constant. In a sense, which reference you use should not be critical to your analysis.
Visualizing EEG signals in real time
Marking your data with manual input
Using the TTL receiver to mark your data
Receiving TCP/IP triggers
How to use the SD card
Using NIC Offline
Using Matlab to visualize EEG
Transcranial stimulation tutorials
Remember that also for stimulation you should place carefully the CMS and DRL electrodes. These two electrodes should go over the left or right mastoid (best to always stick to one side). First clean up the mastoid area where you are going to attach the DRL/CMS electrodes (using Sticktrode adhesive electrodes). You can use a paper napkin with some water or alcohol. Removing grease and dry skin will help you get good signal. Stick the DRL/CMS electrodes close to each other, with the DRL on the bottom. These two Sticktrode electrodes should be close to each other but not touch. The CMS electrode should be on top and squarely on top of the mastoid bone. This will avoid contamination from blood vessels (ECG like signals).
