Frequently Asked Questions (with Answers!)

• Getting Started
  • What is MEG?
  • What is an equivalent current dipole?
• Head models
  • localSpheres warns me about a fiducial mismatch.
  • localSpheres warns me that my dataset does not have measured head localization information.
• SAMcov and SAMsrc
  • Basic usage.
  • What is a state imbalance?
  • What resolution should I use?
  • How can I tell if a state imbalance has occurred?
  • What does the output of SAMsrc represent?
  • What are the basic steps for doing virtual channel analysis?
  • What frequency bands should I look at?
  • What is the difference between evoked and induced responses? This answer also discusses the difference between phase-locked and non-phase-locked activity.
  • Can I do a cluster analysis?
  • What is aMEG?
  • Can I use ICA and SAM together?
• MEG vs FMRI
  • What is the relationship between BOLD and ERS/ERD?
  • Is increased BOLD more related to ERS in certain bands?
• General Signal Processing
  • What is the Hilbert Transform?
• What is the MEG Lead Field?