title: Comparison of spatial and temporal independent component analyses of electroencephalographic data: a simulation study.
abstract: OBJECTIVE
  Some discrepancies between EEG and fMRI results may arise due to different data analysis strategies. Here a bunch of analytical approaches derived from fMRI domain are applied to simulated EEG data and results are compared with results of traditional EEG analysis.
  
  
  METHODS
  Simulations were performed using SPM8 capabilities. Traditional EEG approach was implemented using EEGlab toolbox; fMRI approach was applied to sLORETA-transformed EEG data using GIFT toolbox. It was tested how well the two approaches are able to distinguish two simulated EEG sources that vary in their localization, frequency, and within- and between-subject variation.
  
  
  RESULTS
  With two widely spaced sources oscillating at different frequencies, both approaches were similarly effective. With two closely spaced sources oscillating at different frequencies, the EEGlab method performed somewhat better. However, it failed to distinguish two widely spaced sources if they oscillated at the same frequency and had the same temporal dynamics.
  
  
  CONCLUSIONS
  The proposed approach is feasible to apply to EEG data, particularly in a study of temporally correlated processes occurring within the same frequency band.
  
  
  CONCLUSIONS
  The proposed approach is straightforward for comparison of EEG results with the existing fMRI framework and for investigation of neural networks in normal and pathological populations.
authors.affiliation: Institute of Physiology, Siberian Branch of the Russian Academy of Medical Sciences, Novosibirsk, Russia. knyazev@physiol.ru
authors.forename: Gennady G
authors.initials: GG
authors.lastname: Knyazev
mesh_terms: D001921:Brain / Q000502:physiology*; D001931:Brain Mapping / Q000379:methods*; D003198:Computer Simulation; D004569:Electroencephalography / Q000379:methods*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*
keywords: EEG; Independent component analysis; Simulation; fMRI; sLORETA