Exploration interdisciplinaire des rêves et du cerveau.
2025-05-21 - 2025-05-22 | IMéRA
Peter SIMOR, neuropsychologue cognitif et directeur du Laboratoire du sommeil et de la cognition à l’Université Eötvös Loránd de Budapest, sera l’invité de la dernière séance du séminaire Inter-disciplines de l’IMERA les 21 et 22 mai prochains, sur le thème “Exploration interdisciplinaire des rêves et du cerveau.” https://www.imera.fr/agenda/peter-simor-exploration-interdisciplinaire-reves-cerveau/
L’accès est libre et ouvert à tous. Rappelons par ailleurs que les doctorants peuvent faire valoir leur présence à ces sessions au titre de la formation doctorale. Pour cela, ils doivent s’inscrire grâce au lien ci-dessous. Merci de les en avertir, et de leur suggérer de nous contacter, si vous pensez que cela pourrait les intéresser. https://adum.fr/script/formations.pl?mod=3678991&site=CDAMU
La rencontre se fera comme chaque fois en deux temps.

– MERCREDI 21 MAI, 14h-17h
Salle de réunion du premier étage de la Maison Neuve
IMERA Place Le Verrier 13004 MARSEILLE
Séminaire autour des travaux de Peter Simor, animé par Antoni Rodriguez Fornells, Professeur de neurosciences cognitives, Université de Barcelone (résident Iméra), Gabriella Crocco (Iméra), Olivier Morizot et Florence Boulc’h (IRES)
Cette séance vise à préparer collectivement la compréhension du discours qui sera développé le lendemain lors de la grande conférence. Elle se focalisera pour l’occasion sur l’analyse de l’article de Yuval Nir et Giulio Tononi : “Dreaming and the brain: from phenomenology to neurophysiology“. A travers cette lecture guidée, notre objectif sera de préparer le questionnement de Peter Simor sur la nature des rêves.
– JEUDI 22 MAI, 16h30-18h30
Salle de conférences, Maison des astronomes
IMERA Place Le Verrier 13004 MARSEILLE
Grande conférence de Peter Simor
Between the shores of sleep and wakefulness: from sleep-wake regulation to subjective experiences
Despite its apparently quiet nature and homogeneous nature, sleep is a markedly heterogeneous state with respect to biological functions, neurophysiological properties, information processing and mental experiences. The sleeping brain is constantly monitoring the balance between the internal homeostatic demands and the need to monitor the external environment in order to detect potential threats or relevant information. Far from passive, the sleeping brain continually negotiates between internal homeostatic needs and the imperative to remain attuned to the external world, in case of threats or salient stimuli. In doing so, it oscillates along a dynamic continuum between deeper, disconnected states and lighter phases marked by heightened information processing. Oneiric (dream) experiences seem to take part in this process and reflect the underlying cyclic patterns of sleep and wake regulation. Are dreams simply epiphenomena or inherent aspects of the sleeping brain? Do they reflect random neural activations or convey personally meaningful information? In this talk, I will explore these questions through the lens of contemporary dream science and cognitive neuroscience, integrating insights from interdisciplinary fields such as neuropsychoanalysis and consciousness research.

Bibliographie préparatoire
Yuval Nir and Giulio Tononi. Dreaming and the brain: from phenomenology to neurophysiology Trends in Cognitive Science 14(2), 2009. doi:10.1016/j.tics.2009.12.001

Multidimensional Semantics for Concrete and Abstract Concepts
2025-09-29 11:00 - 12:00 (Europe/Paris) | Salle des voûtes, St Charles, 3 place Victor Hugo, Marseille, 13001, France
Penny M. Pexman
Western University, Canada

Multiple representation theories posit that concepts are represented via a combination of properties derived from sensorimotor, affective, linguistic, and other experiences. One advantage of this approach is that it helps address the challenge of abstract meanings, like wisdom and friendship, which are central to our mental and social lives and yet cannot be directly experienced through the senses. I will describe a series of studies in which my colleagues and I have tested predictions of multiple representation theories for acquisition and processing of concrete and abstract word meanings, exploring the roles of sensorimotor, interoceptive, and social experience. The development of large-scale word norms and behavioural megastudies has enabled consideration of multiple lexical and semantic dimensions and exploration of the possibility that these dimensions have simultaneous and interacting effects on behaviour. Using these “big data” I will consider how these multiple factors might be mapped in semantic space.

BIO: Penny Pexman is Vice-President (Research) and Professor of Psychology at Western University She joined Western in 2023, having previously spent 25 years at the University of Calgary, where she served in a number of research leadership roles including Associate Dean (Research) in the Faculty of Arts and Associate Vice-President (Research). Penny was Editor-in-Chief of the Canadian Journal of Experimental Psychology and Associate Editor of the Journal of Memory and Language. She is past President of the Canadian Society for Brain, Behaviour and Cognitive Science, past Governing Board Chair for the Psychonomic Society, a current member of Governing Board of the Cognitive Science Society, and co-founder of Women in Cognitive Science – Canada.
Penny’s research expertise is in cognitive development, psycholinguistics, and cognitive neuroscience. In broad terms, she is interested in how we derive meaning from language, and how those processes are changed by experience. She has published more than 150 journal articles on those topics. For over 2 decades her work has been continuously funded by two of Canada’s federal funding organizations (SSHRC and NSERC), including NSERC’s prestigious Discovery Accelerator Supplement. She is an elected fellow of the Canadian Psychological Association and the Association for Psychological Science and has been honoured with 9 awards for mentorship and teaching excellence.

Adaptation to a bilingual input and variability in early language acquisition
2026-02-06 10:30 - 12:00 | B011 LPL, 5 avenue Pasteur, Aix-en-Provence, 13100, France
Prof. Laura Bosch from Barcelona University

Abstract:
Infants and children growing up in bilingual/multilingual environments should no longer be considered as exceptions to the norm, even for those living in monolingual societies. But bilingualism is a broad construct, covering a diversity of dual language exposure contexts, modulated by differential properties of socio-educational environments and language typologies. Adequately addressing the heterogeneous nature of bilingual language acquisition remains challenging. Research developed in the last twenty-five years, reflects important changes in the type of questions that have been addressed: from an initial focus on early language differentiation issues, to more recent studies focusing on the identification of adaptive mechanisms, understanding variability in acquisition, and getting more nuanced views on the processes that lead to building separate but interconnected language systems from a dual language input. In this talk, I will first summarize studies based on infants simultaneously exposed to close language pairs (e.g., Spanish and Catalan), and I will then contrast these studies with data obtained from populations exposed to more distant languages. Language proximity stands out as a factor likely to modulate acquisition in such domains as phonological, lexical, and morphosyntactic acquisition. The talk will successively cover two separate but interconnected areas: the early building of native language phonetic/phonological categories, and word-learning strategies in dual vocabulary building. This narrow focus might contribute to identify research questions that remain open for future studies on early bilingualism.

Testing the neural noise hypothesis of dyslexia
2026-04-20 11:00 - 12:00 | Salle des voûtes, St Charles, 3 place Victor Hugo, Marseille, 13001, France
Dyslexia is a specific learning disorder affecting approximately 7–12% of the population and is more commonly diagnosed in males than in females. While several cognitive and neural factors associated with dyslexia have been identified, the precise causal mechanisms underlying reading difficulties remain unclear. One recent account, the neural noise hypothesis (Hancock et al., 2017), proposes that reading difficulties arise from an imbalance between excitatory and inhibitory (E/I) processes (increased cortical excitability) leading to impairments in phonological awareness, rapid automatized naming, and multisensory integration.
I will present our studies which tested key predictions of this hypothesis. First, we examined whether low-level multisensory integration contributes to dyslexia and whether this effect is sex-specific. Next, we directly tested the neural noise hypothesis using electroencephalography (EEG) power spectrum measures and concentrations of Glutamate (Glu) and GABA obtained with magnetic resonance spectroscopy (MRS) at 7T.
Only males with dyslexia exhibited deficits in multisensory integration of simple, non-linguistic stimuli, as assessed by a reaction time task. However, EEG and MRS results, supported by Bayesian analyses, provided no evidence for differences in E/I balance between groups, challenging the hypothesis that cortical hyperexcitability underlies dyslexia.

Bio
Katarzyna Jednoróg is a professor of cognitive neuroscience and head of the Laboratory of Language Neurobiology at the Nencki Institute of Experimental Biology, Polish Academy of Sciences in Warsaw. Her research focuses on the neurobiological basis of language and reading development in both typical and atypical populations, with a particular emphasis on developmental dyslexia. She investigates how brain structure and function support literacy acquisition, using non-invasive neuroimaging methods such as EEG, fMRI, and magnetic resonance spectroscopy.

Brain mechanisms for structuring and searching through knowledge via cognitive maps
2026-06-29 11:00 - 12:00 | Salle des voûtes, St Charles, 3 place Victor Hugo, Marseille, 13001, France
Simone Viganò (Neurospin, CEA & Université Paris-Saclay)
A central challenge for the brain is not only storing knowledge, but organizing it in a form that can be flexibly searched, recombined, and used to guide behavior. Over the past decade, the cognitive map framework has emerged as one leading account of how this may be achieved, proposing that neural systems involved in spatial navigation also support the representation of abstract relationships among concepts, memories, and experiences.
In this talk, I will discuss a series of fMRI, sEEG, and eye-tracking studies conducted in recent years to investigate how cognitive maps support the organization, retrieval, and exploration of knowledge across different domains. These studies suggest ways in which the cognitive map framework may be extended to accommodate some of the distinctive characteristics of primate interactions with the environment and human conceptual knowledge.
