How to store EEG data
EEG data need to be stored in a specific way to enable easy automated processing. Please follow the guidelines below.
An EEG experiment will typically consist of:
1. A file containing the EEG data. These files have the extension .bdf. These files are stored on computer 1, which is located in the control area.
2. A file containing the task performance data. These files have the extension .txt. These files are stored on computer 2, which is located in the test area.
We define a subject-specific code for each subject. This subject-specific code for each subject is: yymmdd_eeg_subjectnumber (with subjectnumber ranging from 01 to 99, and indicating the number of the subject on that specific day). If you measure three subjects on October 15 2018, their subject numbers will be 01, 02, and 03 and their subject-specific codes: 181015_eeg_01 181015_eeg_02 181015_eeg_03 All data from a single subject and a single session should be stored in a folder that has the subject-specific code as name.
EXAMPLE folder names:
To indicate different experiments for the same subject, you are required to add an experiment number: yymmdd_eeg_subjectnumber_experimentnumber (with experimentnumber ranging from 01 to 99).
So, if you have a subject perform two experiments (or two eeg measurements), the codes will be:
181018_eeg_01_01 (for experiment 1)
181018_eeg_01_02 (for experiment 2)
EXAMPLE file names:
Setting up ActiView to save files with the correct name
As soon as you select ‘Start File’ in the BioSemi software, you are required to specify the filename and file location for the eeg data. Make sure that you save one eeg file (.bdf file) for each experiment.
Go to the D: (or C:) drive and then go to the BDFdata folder
Make a directory named as the subject-specific code: yymmdd_eeg_subjectnumber (ranging from 01 to 99)
For example, 181012_eeg_01 for the recordings of the first subject who was tested on November 12 2018.
Go to that folder and define a filename for each separate eeg recording / experiment. Use the experiment-specific code:
For example, 181012_eeg_01_02 for the second recording of the first subject that was tested on October 12 2018.
Setting up Presentation to save files with the correct name
For the performance data, which are collected using Presentation, enter the appropriate subject code (yymmdd_eeg_subjectnumber_experimentnumber) in the Presentation box. The performance file (.txt file) will be saved to the folder ‘Log’ in the main task folder.
Transporting data from the lab computers to the central storage
After the experiment, all files should be stored on the central storage server. This includes the output files from the experiment (.txt files) and the eeg files (.bdf files).
These files should be place in the same directory, which is named after the subject-specific code. The storage is located @ : \\storage.fss.uu.nl\pf_researchdata$\Matthijs_Vink\data\raw_data
Click the link for instructions on how to store your data on the central storage server.