28 Jun, 2021 · 12:00 al 28 Jun, 2021 · 13:00 https://meet.google.com/ijd-agcd-rye
Seminario «Overfitting mitigation in correlation matrices and applications to the study of brain connectivity»
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Miguel Ibáñez
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Conferencias, seminarios, divulgación científica
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Seminario (online y presencial) a cargo del Dr. Miguel Ibáñez, ISTC-CNR (Italy).
Abstract: We compare various known and original strategies of overfitting mitigation in correlation matrices, in the context of brain functional connectivity. In particular, we infer a database of human brain activity from functional Magnetic Resonance Imaging (fMRI), beyond Maximum Likelihood inference and using the multivariate Gaussian as likelihood. We show that the relative algorithm performances are consistent across subjects, and across samples of a synthetic database of similar characteristics. We observe as well that the resulting cleaned correlation matrices, that are proposed as a refined model of functional connectivity, depend crucially on the cleaning algorithm. We discuss possible applications of these findings to network neuroscience.
- Fecha: Lunes, 28 de junio 2021
- Lugar: Aula de ordenadores del Área de Física de la Materia (hasta completar aforo). Online: https://meet.google.com/ijd-agcd-rye
- Horario: 12:00 h.
- Organiza: grupo de Física Estadística de los sistemas Complejos
- Más información: Daniel Manzano | manzano@onsager.ugr.es
