CoPhy team

CoPhy team

@cophy.bsky.social

Computation, Cognition, & Neurophysiology team at CRNL, Lyon, France

159 followers141 following34 posts

CoPhy team reposted

Decision, Action, and Neural Computation (DANC) lab
@danclab.bsky.social

Our multilayer MEG paper is out today in Nature Communications: depth-resolved laminar inference in humans 🧠#neuroskyence www.nature.com/articles/s41...

nature.comMultilayer MEG source modelling enables depth-resolved laminar inference in humans - Nature CommunicationsResearchers developed a multilayer MEG framework that estimates activity across cortical depth non-invasively. Simulations and three human datasets show when reliable laminar inference is possible, en...
CoPhy team
@cophy.bsky.social

We were able to identify two distinct alpha frequencies with different processing specificities (modulatory and feature-related) and laminar profiles. Higher alpha frequency was associated with better performance in the visual oddball detection task participants had to perform.

CoPhy team
@cophy.bsky.social

We conclude that alpha band oscillations play a role beyond widespread inhibition and may be actively involved in stimulus processing at the level of visual features!

CoPhy team
@cophy.bsky.social

Congratulations to Viktoriya Manyukhina for leading and mastering these complex analyses! The key results of this work have been successfully replicated in children (bioRxiv)!

CoPhy team
@cophy.bsky.social

Our findings reveal that muscle inhibition (indexed by reduced EMG signal) in the load-supporting arm in anticipation of self-initiated lifting is linked to decreased cortical excitability in the SMA (indexed by reduced high-gamma activity) and specific beta bursts in the same area.

CoPhy team
@cophy.bsky.social

Burst-centered connectivity analysis further revealed directed influence from lateral prefrontal and premotor cortex, supporting anticipatory muscle inhibition.

CoPhy team reposted

Thomas Hinault
@thinault.bsky.social

Currently recruiting 2 postdoc fellows, 1 Ph.D student and 1 research assistant to work on research projects about the EEG/fMRI mechanisms underlying temporal cognition and their modulations using VR. DM if interested!

CoPhy team
@cophy.bsky.social

Curious about our good old alpha rhythm, but not sure where to start or how to deepen your understanding? Dive into the newly released extensive review paper by Ole Jensen & Mathilde Bonnefond! It offers an overview of the field and highlights the key questions that will shape future research

doi.orgThe alpha rhythm: from physiology to behaviour | Physiological Reviews | American Physiological SocietyThe alpha rhythm, first identified by Hans Berger 100 years ago, is the dominant non-invasive electrophysiological signature of the healthy human brain in the awake state. For decades, it was believed that the alpha rhythm reflected rest or idling; however, this perspective changed in the 2000s when researchers found that alpha oscillations increase with cognitive demands. This discovery led to a paradigm shift, demonstrating that alpha oscillations reflect the functional inhibition of brain regions that are not needed for a specific task, thereby directing information to task-specific areas. We have reviewed the physiological mechanisms involved in generating alpha oscillations, which has informed computational models explaining how these oscillations emerge within physiologically realistic networks. At the behavioural level, alpha oscillations are strongly modulated across nearly all cognitive paradigms tested in humans, reflecting the allocation of computational resources within the active brain network. Research in individuals with attention-related issues has highlighted their impaired ability to modulate alpha oscillations, which is associated with performance deficits. Therefore, further exploration of alpha oscillations has the potential to uncover causal mechanisms underlying attention problems, such as those related to ADHD and ageing. Lastly, advancements in technology are opening new avenues for characterising alpha oscillations in ecologically valid settings and across the lifespan. This progress sets the stage for exploring the role of alpha oscillations in cognitive development and their functioning in natural environments.

CoPhy team reposted

TechCrunch
@techcrunch.com

French AI startup Mistral today launched Devstral 2, a new generation of its AI model designed for coding, as the company seeks to catch up to bigger AI labs like Anthropic and other coding-focused LLMs.

techcrunch.comMistral AI surfs vibe coding tailwinds with new coding models | TechCrunchFrench AI startup Mistral today launched Devstral 2, a new generation of its AI model designed for coding, as the company seeks to catch up to bigger AI labs like Anthropic and other coding-focused LLMs.
CoPhy team
@cophy.bsky.social

This paper describes a way to incorporate beta bursts in pipelines of motor imagery BCI and shows that beta bursts outperform signal power in terms of classification accuracy and information transfer rate

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CoPhy team
@cophy.bsky.social

We also discuss alternative mechanisms, also based on alpha oscillations, that help resist distraction. Some of these mechanisms involve alpha oscillations in the parietal region and the ventral attention network.

CoPhy team
@cophy.bsky.social

In this paper, we discuss the ongoing debate regarding whether alpha oscillations play a role in suppressing the processing of distractors by modulating gain in early sensory regions. We hope it is considered balanced and provides guidance for future work

CoPhy team
@cophy.bsky.social

This paper describes a neural mass model that integrates plasticity under epileptic activity. The model helps to better understand the formation of epileptogenic networks in the presence of an epileptic focus

CoPhy team reposted

Sylvain Baillet
@sylvainbaillet.bsky.social

Excited to deliver Release 3 of The Open MEG Archives:🧠🧲 644 participants ∣ over 150 hrs of task-free recordings ∣ incl. Parkinson’s disease, ADHD, chronic pain + 444 healthy controls ∣ defaced structural MRI volumes ∣ individual questionnaire data. www.neurospeed-bailletlab.org/news/announc...

neurospeed-bailletlab.orgAnnouncing Release 3 of The Open MEG Archives (OMEGA) — Baillet Lab [ neuroSPEED ]We're thrilled to announce the latest expansion of The Open MEG Archives (OMEGA). Dive into over 150 hours of task-free MEG recordings from 644 participants , including individuals with Parkinson’s...
CoPhy team
@cophy.bsky.social

Tommy Clausner, Ole Jensen and I are pleased to announce that our recent opinion paper is now online! www.eneuro.org/content/11/1... It covers a relatively broad field of research but we hope you will find some ideas interesting there.

eneuro.orgVisual Processing by Hierarchical and Dynamic MultiplexingThe complexity of natural environments requires highly flexible mechanisms for adaptive processing of single and multiple stimuli. Neuronal oscillations could be an ideal candidate for implementing su...
CoPhy team
@cophy.bsky.social

These results led us to question the impact of severe paralysis on attentional control in this preprint: arxiv.org/abs/2310.00266

arxiv.orgIs controlling a brain-computer interface just a matter of presence of mind? The limits of cognitive-motor dissociationBrain-computer interfaces (BCI) are presented as a solution for people with global paralysis, also known as locked-in syndrome (LIS). The targeted population includes the most severe patients, with no residual eye movements, who cannot use any communication device (Complete LIS). However, BCI reliability is low precisely in these cases, technical pitfalls being considered responsible so far. Here, we propose to consider also that global paralysis could have an impact on cognitive functions that are crucial for being able to control a BCI. We review a bundle of arguments about the role of motor structures in cognition. Especially, we uncover that these patients without oculomotor activity often have injuries in more 'cognitive' structures such as the frontal eye field or the midbrain, exposing them to cognitive deficits further than canonical LIS population. We develop a hypothesis about the putative role of the motor system in (covert) attention, a capacity which is a prerequisite for most BCI paradigms and which should therefore be both better assessed in patients and considered.
CoPhy team
@cophy.bsky.social

Recent findings suggest that beta band brain activity occurs in bursts rather than sustained oscillations. In this study we analyze EEG recordings of hand motor imagery BCI tasks and show that on the single-trial level beta burst rate modulations are advantageous to beta power in terms of decoding.

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