[Eeglablist] sleep study by analyzing all-night EEG

[Masaki NISHIDA]

Dear everyone,

I am a new user of EEGLAB and study the electric activity during human 
natural sleep using scalp EEG and intracranial EEG (planted subdural or 
depth of brain, for the evaluation of epilepsy patients ).
I have a couple of questions because I must handle the long-lasting data.


1. How could I get the matrix data of spectra alalysis of each channel and 
frequency?
   I want to compare the magnitudes of frequency band among the subjects, so 
it would be useful to extract data as matrix in the workspace.  For long 
time I have used a FFT method, so I'm not familiar with multitaper methods.


2. In sleep study, long-lasting period (for example, slow wave sleep or REM 
sleep) is our interest.  Is it possible to extract such a long duration as 
epochs?  If impossible, I think to use data after rejecting other sections.

3. I would like to know whether the ICA is useful for evaluating sleep 
recording.  We can find various forms of waves in the human sleep EEG, such 
as big delta wave during non-REM sleep, low scattered fast wave during REM 
sleep.  I wonder if we can use ICA or
other rejecting artifacts events.



I hope to hear good suggestions.


Best wishes,



Masaki Nishida M.D.,Ph.D.

Department of Psychiatry, Center for Sleep and Cognition,
Harvard Medical School, Beth Israel Deaconess Medical Center
e-mail: mnishida at bidmc.harvard.edu