[Eeglablist] ICA analysis for mu-rhythm detection

[Indir Jaganjac]

Hi Katerina,
 
 
 
 
 
 
 
I agree with explanation written by Dr.Scott Makeig. 
I would like to add a few points.
 
 
Motor imagery tasks are occurring in mu-rhythm (8-12 Hz) and there is decrease during
hand or finger movement or in preparation for movement (event-related desynchronization, ERD) and increase after movement and in relaxation (event-related synchronization, ERS). 
So both ERD and ERS are ERP events. 
After Tools>Run ICA, you can do Plot>Channel ERPs,ERP map series,Sum/Compare ERPs and also Plot>Component ERPs.
 
 
 
 
 
 

regards,
I. Jaganjac
 
 
 
 
 
 
 
 
 
 
 
 
 

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From: Katerina <jeux_d at yahoo.gr>
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Date: Tue, 24 Nov 2009 14:44:32 +0200
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Subject: [Eeglablist] ICA analysis for mu-rhythm detection
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Hi,
i have performed ICA analysis through EEGLAB (Tools -> Run ICA) to data 
of three different experiments. All subjects had performed hand or 
finger movement. However, after performing ICA and ploting (Tools -> 
Component spectra and maps) at 10Hz, the topographic maps didn't show 
the correct activation, i.e. activation at the motor cortex of the 
contralateral hemisphere. As for the third experiment in particular, the 
subject had been repeatedly tapping the finger of the right hand, and 
after ICA analysis, the map only showed activation at the occipital lobe.
Is there any explanation for this behavior of the data? Is there any 
particular reason why ICA wouldn't work with mu-rhythm detection and 
hand movement?


 


      
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