I have a set of data but half was recorded with one set of parameters and the other half with another (the set-up file was changed).
One set of data were recorded with these parameters;
Alternating Current. Sampling rate of 500Hz, Low Pass filter 100Hz, High Pass Filter 0.05Hz.
The other set of data were recorded with these parameters;
Direct Current. Sampling rate of 1000Hz, Low Pass filter 30Hz, High Pass Filter 0.15Hz.
I know I will need to equate the sampling rates and filters offline during the pre-processing but my main question is whether the raw data files are comparable, as some were recorded in alternating current and some direct current?
Hi,
Contrary to raw AC EEG datasets, the baseline about which the signal oscillates in raw DC EEG datasets actually changes over time (DC drift). You should not have any problem comparing them to each other as soon as you equally remove low frequencies in each other.
Be also careful when cleaning/removing artifacts such as eye movements as they can in certain cases take different shapes when recording in AC/DC.
Here is an article that you might find interesting : Hennighausen E, Heil M, Rösler F. A correction method for DC drift artifacts. Electroencephalogr Clin Neurophysiol. 1993
Regards.
Hi Mathieu,
Thank you, that confirms my thinking. I will look at the article also.
All the best.
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