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Review of methods for solving the EEG inverse problem

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Check out this Knowledge Base article from StressTherapy Solutions: Review of methods for solving the EEG inverse problem.

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Study at a glance

Area
QEEG, Methods & Mechanisms
Study type
Review & meta-analysis
Authors
Pascual-Marqui RD
Journal
International Journal of Bioelectromagnetism
Year
1999
Protocol
EEG inverse solution simulations

Key findings

  • Of five inverse solutions tested, only LORETA localized sources correctly in 3D space
  • The author advises against minimum norm, weighted minimum norm, Backus and Gilbert and WROP for 3D localization of EEG generators
  • Localization tests with single and multiple sources are proposed as a minimum requirement for any tomography
  • LORETA in the standard Talairach brain allows quantitative neuroanatomical localization

A methods review comparing five linear approaches for estimating the 3D brain sources of scalp EEG: minimum norm, weighted minimum norm, Backus and Gilbert, weighted resolution optimization (WROP) and low resolution brain electromagnetic tomography (LORETA). Each was tested on how accurately it localized single and multiple simulated sources. Only LORETA localized correctly in 3D; the author likens the others to X-rays that lack depth information and advises against them for 3D localization. The paper also presents LORETA in standard Talairach brain space.