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7 October 2019

Brain waves to predict the world

“Andrea Alamia et Rufin VanRullen. Alpha oscillations and travelling waves : signatures of predictive coding ? A paraître dans PLOS Biology.”

The functioning of the brain is still an enigma and many models have been advanced to try to explain how we perceive the outside world. Predictive coding, proposed about twenty years ago, is based on the idea that the brain is capable of generating a mental representation of the outside world that is then compared to actual sensory inputs. The differences between prediction and reality will lead to neural correction activity; if the sensory inputs match the model perfectly, no activity is generated. In their paper to be published in PLOS Biology, Andrea Alamia and Rufin VanRullen demonstrated that a predictive computational model explained the development and characteristics of a fundamental property of cortical processing of visual information: alpha brain waves at 10 Hz. A 2-layer predictive model with only neural transmission times as time constraints shows the appearance of alpha rhythms similar to those observed experimentally on electroencephalograms. The same multi-level model explains the appearance of waves propagating through these different levels with a direction depending on the cognitive state: upward direction during the processing of visual information and downward direction during rest. The predictions obtained are perfectly verified by analyzing two sets of experimental EEG data recorded on the scalp of subjects in response to visual stimuli and during rest. These innovative results suggest that alpha rhythms, omnipresent in the brain and whose functional roles are still being debated, could reflect the neural calculation involved in predictive coding.

22 May 2019

Press Releases

L’actualité scientifique " L’intelligence artificielle pour décoder les pensées" a été relayée sur le site del’INSB. Un tweet sera publié à 17h30 sur le compte Twitter de l’Institut.

cette actualité est également reprisesur le site de l’université et a également été diffusée surLa lettre d’info des Instituts du CNRS « En direct des labos » à destination des journalistes.

22 May 2019

Artificial intelligence to decode thoughts

Despite recent advances in brain imaging, the brain’s representation of the visual world is still largely unknown. Using a new artificial intelligence technique - deep learning - to decode brain activity recorded in functional imaging, CerCo’s Rufin VanRullen and Leila Reddy can reconstruct images seen - or imagined - by subjects. This method, published in Nature Communications Biology, opens the door to new explorations of the brain.

Translated with www.DeepL.com/Translator

Reconstructing faces from fMRI patterns using deep generative neural networks Rufin VanRullen & Leila Reddy Nature Communications Biology

3 April 2019

increased oxidation of iron, RNA and dystrophic microglia in the brains of older male marmosets.

Featured Articles

The editorial team of the American Journal of Primatology has chosen to highlight the following article: Loss of ferritin-positive microglia relates to increased iron, RNA oxidation, and dystrophic microglia in the brains of aged male marmosets Juan de Dios Rodríguez-Callejas, Daniel Cuervo-Zanatta, Abraham Rosas-Arellano, Caroline Fonta, Eberhard Fuchs, Claudia Perez-Cruz Volume 81, Issue 2, February 2019->https://onlinelibrary.wiley.com/doi...] This paper, which involves a CERCO researcher, presents how ferritin provides microglia protection in adult and elderly marmosets, while in elderly subjects, the decline in ferritin and the increased amount of iron in brain tissue may be related to the increase in the number of cells with oxidized RNA, possibly associated with the development of neurodegeneration...

18 March 2019

Waves in the brain

Brain activity is structured into brain rhythms that differ in frequency, with different frequencies reflecting different mental states. But these brain waves, especially the alpha waves at 10Hz, also have functional roles that still need to be clarified.

By recording brain activity on the surface of the scalp and using electroencephalographic and mathematical techniques of inverse correlation, Rufin VanRullen and Diego Lozano-Soldevilla showed that alpha waves were true "perceptual echoes" propagating over several cycles and in a very precise organization. This organization makes it possible to postulate that perceptual echoes behave like "radar screens" that would scan the visual field rhythmically every 100ms, thus making it possible to locate an object in space and time; each position in the surrounding space is scanned at different times and in a well-defined order. These results published in Cell Reports make it possible to propose for the first time a functional role for these brain waves at 10 Hz, which would be a direct reflection of the cortical processing of sensory information. Link for article

This scientific news "Waves in the brain" was also broadcast on the CNRS Institutes’ Newsletter"Direct from the labs" for journalists.


To be noted

Brain Week 2019

Brain Week 2019 will take place from March 11 to 17 Program.

Conférences et séminaires

Séminaire
Cerco Student Day

mercredi 04 décembre 2019 14h
Salle de conférence (Pavillon Baudot), Hôpital Purpan
Presentation of student initiatives and speed talking sessions

Conférence CerCo
Réunion De La Société De Psychophysiologie Et Neurosciences Cognitives (spnc)

jeudi 12 décembre 2019 13
Salle de conférence (Pavillon Baudot), Hôpital Purpan
De la compréhension à l'adaptation, l'apport de la psychophysiologie aux handicaps

Conférence CerCo
Christophe Hurter
ENAC
jeudi 19 décembre 2019 11h00
Salle de conférence (Pavillon Baudot), Hôpital Purpan
Data exploration with Virtual Reality

Conférence CerCo
Laurent Koessler
Centre de Recherche en Automatique de Nancy
mardi 21 janvier 2020 14:30
Salle de conférence (Pavillon Baudot), Hôpital Purpan
TBA

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InCOGnu

L’association InCOGnu organise régulièrement des soirées débats et ateliers autour des Sciences Cognitives. More...