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Functional boundaries in the human
#cerebellum
revealed by having participants perform 26 tasks spanning motor, cognitive, social, and affective domains during
#fMRI
A method to decode unknown variables by finding shapes in neural data shows the existence of a low-dimensional
#manifold
that forms a continuous ring of stable states in mouse head direction neurons
Single-cell and spatial transcriptomics of
#dopamine
neurons from human substantia nigra pars compacta (SNpc) reveals 10 subtypes, one of which is selectively lost in
#Parkinson
's disease
New from
@tkam80
@abdul_squared
@macosko
and colleagues
A new principle for learning in neural networks called ‘prospective configuration’, which is more efficient in learning and consistent with neural and behavior data than backpropagation
A method to generate new neurons in the cortex and dentate gyrus of aged mice with a single injection of an antisense oligonucleotide (ASO), opening prospects for replacing neurons lost to neurodegenerative disease
Three genetic
#dopamine
subtypes within the substantia nigra pars compacta each have a unique set of responses to rewards, aversive stimuli, and accelerations and decelerations
Diazepam, a widely prescribed
#benzodiazepine
, impairs the structural plasticity of dendritic spines and increases microglial phagocytosis of synaptic material, causing cognitive impairment in mice
#Microglia
and
#astrocytes
propagate
#neurodegeneration
by releasing fragmented and dysfunctional
#mitochondria
into the neuronal milieu. Inhibiting pathological fragmentation of glial mitochondria blunts neuroinflammation and increases neuroprotection.
The brains of
#COVID
-19 patients have damaged blood vessels (more so-called string vessels representing remnants of lost capillaries); SARS-CoV-2 infects brain endothelial cells and leads to microvascular pathology via RIPK signaling
While Bayesian models provide good accounts of perceptual decisions, it is unclear how their components are represented in the brain. Here, the authors show that uncertainty decoded from visual cortex helps predict behavior.
Total social isolation for 10 hours evokes similar midbrain craving responses in human participants as 10 hours of fasting does; new from
@livia_tomova
,
@rebecca_saxe
,
@kaymtye
Cell-type-specific retrograde and anterograde tracing of neurotransmitter-specific projections to the ventral tegmental area (
#VTA
) reveals diversity of GABAergic inputs
🎉Please join us in congratulating Shari Wiseman (
@sharilwiseman
), who starts as our new Chief Editor today! And, learn more about our full team of outstanding editors here:
In primates, activity in visual cortex is minimally driven by spontaneous body movements. These results confirm the functional specialization of primate visual processing and contrast with findings in mice.
How do multiple synapses interact to modulate learning?
@ejagnes
&
@TPVogels
postulate models of “codependent” synaptic plasticity that promote rapid, multi-synaptic attainment of stable receptive fields, dendritic patterns and plausible neural dynamics
Using dimensionality reduction techniques
@mikio_aoi
,
@ValerioMante
, and
@jpillowtime
disentangle the contributions of different task variables to neural population activity.
Transplanting wild-type neurons into the brains of
#Alzheimer
's disease model mice shows that
#microglia
contribute to the infiltration of amyloid beta (
#A
β) into the grafts
We are deeply saddened to hear of Ben Barres's passing. He will be remembered as a brilliant scientist, a beloved mentor, and a passionate advocate for diversity.
MRI data from 11,354 individuals in the
@uk_biobank
establishes a link between white matter microstructure and functional connectivity;
#GWAS
identified genetic associations of these microstructure–function relationships.
A human
#Alzheimer
's disease (AD) culture model using neurons, astrocytes, and microglia in a 3D microfluidic platform recapitulates key AD features, including beta-amyloid aggregation, phosphorylated tau accumulation, and neuroinflammatory activity
Trans-Seq combines a fluorescent anterograde trans-synaptic tracer with scRNAseq for post-synaptic circuit discovery from defined pre-synaptic neurons; used here to to map retinal ganglion cell (RGC) types to superior collicular (SC) circuits
Watch our animation on
#Parkinsons
disease. It focuses on mechanisms whereby neurons become dysfunctional, how pathology develops, and touches on therapeutic strategies. Made with
@NatRevNeurosci
and produced with support from
@Roche
.
Humans (but not macaques) have cortical regions with a strong preference for harmonic tones compared to noise, perhaps due to the human brain's needs for processing speech and music 🎶
Gray matter volume changes in psychiatric illness occur in highly variable locations across individuals, but these differences often aggregate within common brain systems
New from
@AshleaSegal
@Afornito
@amarquand
et al.
Two new papers on noninvasive brain stimulation in humans:
Noninvasive theta-burst stimulation of the human striatum enhances striatal activity and motor skill learning
@UPHUMMEL_EPFLMW
@MJ_WesselEB
@BeanatoElena
#Dopamine
signals shift gradually from time of reward to time of cue, similarly to the progression of temporal difference error in machine learning
New from Mitsuko Watabe-Uchida,
@naoshigeuchida
, and colleagues
Cerebellar Purkinje cells directly inhibit neurons in the parabrachial nuclei that in turn influence many forebrain regions. This alternative output pathway could enable the cerebellum to regulate emotions, anxiety, aggression and affect.
BREAKING NEWS:
The 2021
#NobelPrize
in Physiology or Medicine has been awarded jointly to David Julius and Ardem Patapoutian “for their discoveries of receptors for temperature and touch.”
.
@KateWassum
and colleagues show that lateral OFC→BLA projections encode the positive value of a reward, whereas medial OFC→BLA projections retrieve this value from memory: . Also, check out the N&V from Shannon Gourley: .
Three-photon microscopy for long-term in vivo three-photon imaging of the entire cortical column and subcortical white matter in adult mice reveals region-specific differences in healthy and regenerative
#oligodendrocyte
formation
@EthanHughesLab
et al.
Hippocampal place codes degraded extensively when mice voluntarily disengaged from a virtual navigation task, suggesting that internal states can gate spatial maps and reorganize hippocampal activity even without sensory and self-motion changes
#Dopamine
neurons projecting to the posterior
#striatum
reinforce avoidance of threatening stimuli, suggesting there are at least 2 axes of dopaminergic reinforcement learning in the striatum: one based on value and one based on external threat
Combining brain imaging, genetics, and behavioral data shows that distinct brainwide distributions of
#serotonin
receptors explain the known division of serotonin effects on human impulsivity and aversive processing
The mouse
#cerebellum
directly, rapidly and effectively modulates basal ganglia
#dopamine
levels and conveys information related to movement initiation, vigor and reward processing
Culturing cerebral
#organoids
in an adapted air-liquid interface system improves neuronal survival and axon outgrowth. These cultures exhibit extracortical projecting tracts that can innervate mouse spinal cord and evoke muscle contraction.
PFC and hippocampus play complementary roles in knowledge generalization: PFC abstracts the common structure among related problems; hippocampus maps this structure onto the current situation
New from
@nikasamborska
@behrenstimb
@WaltonLabNeuro
et al.
If synaptic
#plasticity
is regulated by high-frequency bursts of spikes, then neurons higher in a hierarchical circuit can coordinate the plasticity of lower-level connections to enable learning complex tasks
Human stem cell-derived
#microglia
engrafted into mouse brain recapitulate human primary microglia gene expression, and provide a model to study
#Alzheimer
’s and other brain diseases
Single-cell RNA-sequencing (
#scRNA
-seq) across regions of the developing human brain, including the telencephalon, diencephalon, midbrain, hindbrain and cerebellum, reveals progenitor heterogeneity and degree of similarity to brain
#organoids
Simultaneous recording from over 200 well-isolated cortical single units in human participants using silicon Neuropixels probes, providing a path for studying human cognitive processes and their dysfunction at unprecedented spatiotemporal resolution
Single-cell profiling of aging mouse white matter reveals a population of interferon (IFN)-responsive
#oligodendrocytes
, which localize in proximity to CD8+ T cells
New from
@ozgungokce
Mikael Simons and colleagues
Homeostatic
#plasticity
mechanisms that reduce cortical activity following overstimulation are dysregulated later in life, such that overstimulation results in synaptic strengthening, elevated activity, and cognitive impairment
@carola_izabela
et al.
#Ketamine
in mice causes spontaneously active neurons to become suppressed while previously silent neurons become spontaneously activated; this may help explain how ketamine induces a "dissociated" state
In
#PTSD
, hippocampal representations of autobiographical memories are similar across people with similar semantic content only for sad but not traumatic memories, pointing to altered brain state during traumatic memory recall
@OferPerl
@Harpaz_I
et al.
Examining brain gene co-expression networks reveals that synaptic pathways—rather than the complement system—are the driving force conferring
#schizophrenia
risk
Disease-associated
#astrocytes
revealed using single-nucleus RNA sequencing in an
#Alzheimer
’s disease mouse model; they increased with disease progression and could also bee seen in aged mouse and human brains
Two new papers on prefrontal regulation of
#sleep
:
Excitatory medial prefrontal cortex (mPFC) neurons promote REM sleep in mice through their projections to the lateral hypothalamus