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P300 recordings during event-related fMRI: a feasibility study
H Otzenberger1, D Gounot, J R Foucher
1UMR 7004-Applications Biologiques et Médicales de la RMN et Génie Biologique et Médical, Université Louis Pasteur (ULP)/Centre National de Recherche Scientifique (CNRS)/IFR 37 de Neurosciences, Strasbourg Cedex-France. otzenber@ipb.u-strasbg.fr
Brain Research. Cognitive Brain Research
|April 12, 2005
Summary
This study shows that combining electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) allows researchers to reliably record P300 event-related potentials (ERPs) during brain scans. This technique enhances understanding of brain activity in cognitive studies.
Area of Science:
- Neuroscience
- Cognitive Science
- Medical Imaging
Background:
- Combining electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) offers high temporal and spatial resolution for studying brain function.
- EEG data recorded within an MRI scanner is susceptible to significant artifacts, necessitating artifact removal techniques.
- Interleaved EEG/fMRI acquisition is crucial for ensuring recorded data accurately reflects brain activity in cognitive studies.
Purpose of the Study:
- To demonstrate the feasibility of recording P300 event-related potentials (ERPs) during fMRI acquisition.
- To validate interleaved EEG/fMRI measurements for cognitive studies using a visual oddball task.
- To investigate the utility of artifact removal filters for improving EEG data quality in combined acquisition.
Main Methods:
- Ten EEG channels were acquired concurrently with fMRI images from five healthy subjects using an interleaved acquisition scheme.
- A three-stimulus visual oddball task with targets, frequent distractors, and rare novel stimuli was employed.
- A post hoc filter was applied to remove cardiac pulse artifacts from the EEG data.
Main Results:
- Interleaved EEG/fMRI acquisition successfully identified P300 ERPs evoked by targets and novel stimuli at specific electrode sites (Fz, Cz, Pz).
- Novel-related ERPs exhibited higher amplitudes compared to target-related ERPs.
- fMRI data revealed stronger Blood-Oxygen-Level-Dependent (BOLD) responses for the target condition.
Conclusions:
- Interleaved EEG/fMRI acquisition enables the reliable recording of P300 ERPs and fMRI data, offering insights into the neural correlates of cognitive processes.
- This multimodal neuroimaging approach can help elucidate the anatomical basis of cognitive ERPs relevant to central nervous system (CNS) disorders.
- The findings support the use of noninvasive, combined neuroimaging techniques for exploring functional brain organization and cognitive function.