As a Masters Project I'll be working on analysis of EEG data. So I have EEG data which when loaded in Matlab shows 32*384*80. Can anyone explain what is channels, epochs in EEG data?
Hi, Pranjal Shashikant Patil !
Would you, by any chance, happen to have more details about the data? Usually EEG data is recorded as 'number of Channels x number of Samples', or vice-versa. In this case, you have a third dimention, which may be related to an experiment's blocks or something of the sort. Is this data from resting-state? Was there any experiment involved? Would you happen to know that?
Hello Carlos Alberto Stefano Filho
The data represents 32 channels and 384 (data points in time) and 80 epoch.
here I'm not able to understand the epoch what exactly it represents?
I see. In this case, I'd say each epoch represents a time-window of 384 data points in time. Depending of your system's sampling frequency, this will amount to a specific time duration. For example, for a 256 Hz sampling frequency, 384 data points would represent a total of 1.5 s (384 data points/256 data points/s). Please note that I am only exemplifying with an arbitrary sampling frequency, and you should apply the original value used for data recording to get how much time each epoch lasts in your case.
In any case, the epoch would represent a time window of a specific duration. If each epoch contains the sime type of information (e.g., a given response to a specific stimulus), you could average them to obtain a mean response of a given stimulus, for example. There are all sorts of different types of analysis you could do, but these would largely depend on what is it you are interested in, your experimental design etc.
I hope to have answered something in the lines of what you were looking for :)
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