Este viernes 12 de abril, a partir de las 12 hrs. se desarrollará la primera conferencia de ciclo de seminarios conjuntos que realizará el Centro Interdisciplinario de Neurociencia de Valparaíso (CINV) y nuestro Instituto, titulada “Aumentando la validez ecológica para lidiar con la complejidad cognitiva: posibles soluciones desde la electroencefalografía intracranial”, que ofrecerá el doctor Carlos M. Hamamé, del Laboratoire de Psychologie Cognitive. CNRS (UMR7290). Aix-Marseille Université, France
Fecha: viernes 12 de abril 2013 12:00 hrs. Café y galletas 11:45 hrs.
Lugar: Auditorium de la Facultad de Arquitectura, Av. El Parque Nº 570, Playa Ancha. Valparaíso
In cognitive neuroscience, protocols of increasing complexity are used to mirror natural conditions and behavior. These are likely to recruit complex and intertwined neurophysiological and cognitive processes. In this context, I focus my research on brain dynamics involved in two very conspicous and natural human behaviors: active visual exploration and language processing. I measure brain activity with several electrophysiological techniques (scalp-EEG, MEG, but mainly intracranial EEG), during cognitively motivated tasks that require active vision or the unfolding of linguistic behavior. Spectral analyses of the recorded brain signals provide precise estimates of when and where the brain becomes active during the task. Since activations are usually wide-spread, I use functional connectivity tools to characterize interactions among those active regions. Finally, the comparison of those brain dynamics with behavioral measures (such as reaction-times, eye movements, or spoken language) reveals the functional contribution of different brain networks. The results of my research indicate that activity in several interacting brain regions is critical for the unfolding of complex behaviors. For instance, during active vision, not only the activity of visually specialized (occipitotemporal) areas is necessary, but also the coordination with top-down attentional (fronto-parietal) signals and corollary instructions coming from the oculomotor (superior colliculus / frontal eye field) system. In the case of language processing, we are showing language networks including previously oversaw brain structures. For instance, involvement of the left hippocampus could even explain the semantico-lexical dissociation we experience during tip-of-the-tongue states. Such findings constrain cognitive models and allow updating in order to better describe integrated physiological and behavioral phenomena.