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Apathy and social withdrawal in schizophrenia: A collaborative study on the impact of psychotherapeutic treatments on the fronto-striatal networks of the motivation and social interactions.
Negative symptoms of schizophrenia are the primary cause of patients’ disability, resulting in major difficulties in everyday functioning and poor quality of life. Strikingly, no pharmacological treatment adequately improves these symptoms. Conversely, several psychotherapeutic interventions exist a
How incentive motivation reduces cognitive noise and improves decision-making under uncertainty
Making decisions under uncertainty, from perceptual judgments to value-based choices, requires combining multiple pieces of ambiguous or conflicting information. Recent research has identified imprecise decision computations as an important contributor to the variability of perceptual and value-base
Deterioration, compensation and decompensation of sensorimotor control processes during aging
Aging is associated with myriad behavioral and physiological modifications. Any modification between young and older adults on sensorimotor performances has long been thought to result from deterioration processes only. Are there not any beneficial sensorimotor modifications that accompany and possi
The biophysical identity of hidden layers in deep convolutional neural networks in the retina
A major goal of sensory neuroscience is to understand how neurons can together extract complex features from natural scenes. Even as early as in the retina, this is still an open challenge. Models built from the responses of sensory neurons to simple stimuli do not generalize to predict how complex,
The role of cortico-cerebellar loops in multisensory processing deficits in autism
The appropriate integration of information from multiple senses is crucial for cognitive abilities such as perception, social communication, and decision-making. Multi-sensory integration is altered in autistic individuals, but the underlying neurobiological mechanisms are poorly understood. The pre
Sensorimotor integration of variability during birdsong learning
There is mounting evidence that variability has an important role in the outcome of sensorimotor learning: in some cases, increased variability during learning is eventually associated with better performance. Regarding developmental vocal learning, an important component of human language, a basal
Dynamical marmoset visuomotor cortical networks for catching a real object in motion
Under natural conditions, many animals perform fast interceptive movements to catch small moving prey. This behavior requires anticipation of the prey’s displacement and relies on the capacity of the brain to overcome the intrinsic neuronal delays in visual and motor systems. However, we have very l
Neural code and top-down mechanisms of inferences during perception of vocal communication in noise
In humans and animals, the perception of noisy acoustic inputs is thought to depend on the ability to predict upcoming events, constraining and biassing perception to the most probable events. Although the predictive brain hypothesis is supported by a wide range of experimental data, the nature of p
Impacts of meditation training on the organisation of resting state intrinsic connectivity networks in the brain: implications for the study of well-being and ageing.
Meditation practices emerged as a promising mental training to improve brain integrity and foster attentional and emotional regulation in ageing populations towards reducing dementia risk. We investigated the effect of meditation training on brain integrity in cognitively unimpaired elderly. The Age
Brain connectivity underlying cognition without a neocortex
Tool use behaviors have evolved not only in primates but also in some birds (e.g. parrots and crows) and even in some teleost fish (e.g. wrasses and cichlids). As birds and teleosts do not have a six-layered neocortex, these similar cognitive functions must have evolved independently in the lineages
Timed decisions: causal mechanisms and TAGging of neuronal ensembles in the prefrontal cortex
As a key property of the nervous system, timing is essential in decision sequences, and is impaired in many neuropsychiatric conditions. Yet timing is poorly understood and is a difficult capability to control in artificial intelligence. Causally linking brain activity and decision timing could ther
Identifying the mechanisms that integrate cardiac interoception with exteroception
The last 10 years have uncovered a treasure-trove of experimental evidence that cardiac signals influence exteroceptive (somatosensory, visual) sensory processing, through both cardiac cycle effects (CCEs) and heartbeat evoked responses (HERs). The interplay between exteroception and interoception i
High Temporal Resolution Longitudinal Cerebral Fetal Baboon MRI Acquisitions for the Study of Cortical Development
BaboFet is an interdisciplinary project that brings together specialists in cortical anatomy, data analysis, fetal MRI acquisitions, non-human primates, and anesthesiology. The project aims at building a unique database of longitudinal fetal brain images acquired on baboons with a very high temporal
Neural mechanisms of learning and representing hidden task structures to afford generalization in problem solving
Humans are adept at generalizing previous experiences to find novel solutions to problems. This behavioral flexibility is a hallmark of human intelligence while it is often severely impaired in patients with psychological and mental disorders and remains a key challenge for most artificial intellige
Neural networks underlying temporally structured behavior
High-level cognitive processes such as planning, reasoning or language rely on temporal sequences of mental events. Recent studies of animal behavior have characterized the temporal structure of sequences of elementary behavioral events with similar concepts than those used to describe language, suc
Striatal circuits underlying comorbid psychiatric disorders
The high prevalence of comorbidities between depression and substance use disorders (SUD) constitutes a growing burden with a major impact on psychological well-being and health systems. This is notably witnessed by the current opioid epidemic affecting the US, where opioid misuse is highly associat
Anatomical projections and functional mechanisms underlying cerebellar influence on hippocampal-dependent Memory
Assemblies of hippocampe place cells form a cerebral cognitive map and are considered to support spatial memory. Although the cerebellum has traditionally been considered a motor structure, our studies revealed its crucial role in the stability of these place cells during active navigation. However,
Phylogeny of depression disorders: study of primal forms of Depression in Invertebrates
According to the World Health Organization, depression is the leading cause of disability in the world. Depression is characterized by persistent low mood, impaired motivation but also by a general decrease in motor outputs that is generally considered as a consequence of brains structures impairmen
The role of MYelination in maturation and synchronization of SPAtial orientation Circuits
Orientation in space is a fundamental cognitive capacity that relies on a brain wide circuit of specialized compass neurons. It develops in young animals, allowing orientation towards the nest, then the spatial navigation system matures progressively to integrate also location and distance informati
Modeling human visual and oculomotor retinotopic maps
Our brains deal and store information through spatial and motor retinotopic maps. The assessment of these maps was for long restricted to the animal model, different studies targeting distinct brain areas and distinct neuronal populations. We aim at determining through whole brain human high field (
Dynamic Visual Inferences and their Neural implementation
Theoretical framework: Our goal is to clarify the fundamental nature of neural processes in the brain that give rise to intelligent perception, cognition and action through a close integration of compatible theoretical, behavioral and neurophysiological approaches. Hypotheses and objectives: A c
Confidence hierarchy: a neurocomputational approach to self-beliefs
Self-beliefs, how we perceive ourselves and our abilities, have a widespread impact on life trajectories. Previous work in psychology and psychiatry has identified self-beliefs as a key predictor in the emergence of mental health disorders, particularly those of anxious and depressive nature: if you
Neural basis of variability in reward-seeking strategies and consequence for nicotine susceptibility
Personality -or individuality- is a striking feature in animal kingdom. Within a similar species, individual animals differ in behavioral traits and preferences, which shape their interactions, their prospects for survival and their susceptibility to diseases. These correlations are well documented,
The neural basis of Primate Face Recognition: a comparative multimodal approach
The macaque monkey has been considered for decades as the best available animal model for understanding the neural mechanisms of visual cognition in humans, in particular for the recognition of faces. Yet, there may be substantial behavioral and neural differences between the two species in face rec
Plasticity of fear conditioned analgesia
Although unpleasant, pain has a crucial physiological role warning and prompting the organism to protect the injured area and to reduce general activity waiting for healing. However, sometimes, organisms have to face other dangers as confronting a predator or escaping hostile environments and need t
The relationships between neural correlates of effort perception and physical activity engagement
Our society currently faces a pandemic of physical inactivity which is associated with many chronic diseases and deaths. Despite policies aiming to encourage individuals to get involved in a regular physical activity, the prevalence of insufficient physical activity remains elevated. It is therefore
Thalamus control of memory engram storage in the retroplenial cortex
Current views on systems memory consolidation posit that long-term memories are reliant on the neocortex. However, the circuit-level and cellular mechanisms allowing to allocate these memories to specific cortical neural assemblies, the so-called engram cells, are still elusive. Recent data indicate
Deciphering the role of the cortical-hippocampal-reuniens/rhomboid network in memory consolidation
In CHARM, we will characterize the role of the thalamic reuniens and rhomboid nuclei (ReRh) in systems consolidation of a spatial memory by establishing 1) When, during the consolidation period, ReRh are involved, 2) How ReRh regulate the reorganization of the memory trace between the hippocampus (H
Deciphering the connectivity of the cortico-reticulo-spinal system, its contribution to motor function and its fate under neurodegenerative conditions
This project aims to study how the cortex and the brainstem reticular formation (RF) act together to control movements in health and under severe and neurodegenerative conditions such as Amyotrophic Lateral Sclerosis (ALS). The RF is typically considered as the main substrate for commanding initia