ERP Source Analysis Guided by fMRI During Familiar Face Processing

Brain Topography
Maria A BobesPedro Valdes-Sosa

Abstract

Event related potentials (ERPs) provide precise temporal information about cognitive processing, but with poor spatial resolution, while functional magnetic resonance imaging (fMRI) reliably identifies brain areas involved, but with poor temporal resolution. Here we use fMRI to guide source localization of the ERPs at different times for studying the temporal dynamics of the neural system for recognizing familiar faces. fMRI activation areas were defined in a previous experiment applying the same paradigm used for ERPs. The Bayesian model averaging (BMA) method was used to estimate the generators of the ERPs to unfamiliar, visually familiar, and personally-familiar faces constraining the model by fMRI activation results. For this, higher prior probabilities in the solution space were assigned to the fMRI-defined regions, which included face-selective areas and other areas related to "person knowledge" retrieval. Source analysis was carried out in three-time windows: early (150-210 ms), middle (300-380 ms) and late (460-580 ms). The early and middle responses were generated in fMRI-defined areas for all face categories, while these areas do not contribute to the late response. Different areas contributed to the generation of the...Continue Reading

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Citations

Apr 25, 2019·Brain Topography·Daniele MarinazzoPedro A Valdés Sosa
Dec 4, 2020·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Ela I OlivaresJaime Iglesias

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