Conférences du GDR

Prochaine conférence du GDR le 6 Mai à 11h

Prochaine conférence du GDR le 25 Mars à 11h

Dans le cadre de son cycle de conférences mensuelles le GDR mémoire vous invite le 25 Mars à 11h à suivre en ligne la conférence de notre collègue Dezso Nemeth (MEMO, CRNL)

Vous trouverez ci-dessous le résumé et le lien pour participer à cette conférence :

Competitive neurocognitive networks underlying learning and memory: from stress to non-invasive brain stimulation

Dezso Nemeth, Lyon Neuroscience Research Center, Université Claude Bernard Lyon 1, France


Human learning depends on multiple cognitive systems related to dissociable brain structures. These systems interact not only in cooperative but sometimes competitive ways in optimizing performance. Previous studies showed that manipulations reducing the engagement of frontal lobe-mediated explicit, attentional processes could lead to improved performance in striatum-related procedural learning. Here I present studies in which we investigated the competitive relationship between statistical learning and frontal lobe-mediated executive functions.  Our result sheds light on the competitive nature of brain systems in cognitive processes and could have important implications for developing new methods to boost learning and memory.

Keywords: implicit learning, statistical learning, lifespan development, rTMS, DLPFC, stress, brain connectivity

Nadine RAVEL vous invite à une réunion Zoom planifiée.

Sujet : Conférence Dezso

Heure : 25 mars 2022 11 :00

Participer à la réunion Zoom

Séminaires du GDR Mémoire-Année 2021-2022-A vos Agendas !

Lieu : zoom

Les titres, résumés et liens seront indiqués au fur et à mesure sur le site du GDR.

Pas d’inscription nécessaire.

La prochaine conférence aura lieu le 29 octobre et notre invité sera Erika Borella

Pour le calendrier complet d’octobre à Juin

Prochaine conférence du GDR-Le 26 Novembre 2021 à 13h

par le Professeur Colin Lever (Durham University, UK)

Participer à la réunion Zoom

ID de réunion : 812 7705 1951
Code secret : 8MKcna

Successfully navigating in physical or semantic space requires a neural representation of allocentric (map-based) vectors to boundaries, objects and goals. Cognitive processes such as path-planning and imagination entail the recall of vector representations, but evidence of neuron-level memory for allocentric vectors has been lacking. Showing such evidence is the main focus of the talk, centred on (Poulter et al, 2021, Nature Neuroscience) and unpublished work in 2-D Virtual Reality. I will first introduce the subiculum, and argue that we should end the neglect of this hippocampal region, e.g.: a) its expansion from the great apes to Pan/Homo clade may be the biggest ‘jump’ in primate hippocampal evolution; b) the subiculum may be the key hippocampal node in the default mode network.

I will describe a novel neuron type, the vector trace cell (VTC), whose firing generates a new vector field when a cue is encountered and a ‘trace’ version of that field for hours after cue removal. (Memory duration is likely much longer in other circumstances.) VTCs are concentrated in the distal (not proximal) region of subiculum (i.e. distal to CA1), consistent with anatomical evidence linking the distal subiculum to the “Where? Memory” pathway. Compared to non-trace cells, VTCs fire at further distances from cues and exhibit earlier-going shifts in preferred theta phase in response to newly introduced cues. This latter finding demonstrates a novel theta-linked neural substrate for memory encoding.

VTCs suggest a vector-based model of computing spatial relationships between an agent and multiple spatial objects, or between different objects, freed from the constraints of direct perception of those objects. Vector representations may be used to organize conceptual or semantic memories in quasi-physical and non-physical spaces.

Pour ceux d’entre vous qui n’ont pas pu assister à la conférence précédente:

La conférence de Leila Reddy est accessible

(Code secret: XJrCQ4a*)