Co-Registering fNIRS and EEG: Advantages and Challenges

November 6th, 2018 JUDIT GERVAIN Université Paris Descartes

Co-registering NIRS and EEG is ideal in that the two methods do not interfere with one another, can easily be integrated into the same headgear, and most importantly, they provide complementary information about brain activity. NIRS offers precise spatial localization, while EGG provides high temporal resolution. Both techniques are non-invasive and well-tolerated by participants, they can therefore easily be used even with vulnerable populations, i.e. preterm newborns, young infants, with whom the use of less participant-friendly methods such as fMRI or PET are not justified for research purposes. Despite these advantages, NIRS-EEG co-recording is not without its challenges. The two techniques work on different time scales, NIRS measuring the slow hemodynamic response (second range), EEG the fast neural activity (millisecond range). This places heavy constraints on possible experimental designs. Furthermore, while multimodal imaging offers more information, this also means dataset with higher degrees of freedom and thus more complicated data analysis and a potentially higher likelihood of spurious results and false positives. As the exact relationship between neural activity and the related hemodynamic response is not fully understood, particularly in developmental populations, interpretation is also more complicated, especially if the NIRS and EEG results do not converge. These issues will be discussed in detail and illustrated through published and unpublished empirical studies with infants.

Tuesday, November 6, 2018, 12:00. ICFO’s Seminar Room

Hosted by Prof. Turgut Durduran