All articles tagged with #cerebellum
Northeastern researchers using MRI in rodents show mescaline uniquely dampens the cerebellum—the brain’s sensory filter—while increasing cross-brain connectivity, potentially driving hallucinatory experiences and linking to sensory-disruption seen in some psychiatric conditions; findings differ from LSD/psilocybin and point to translational steps toward human studies and clinical relevance.
McGill researchers link reduced firing of cerebellar Purkinje cells to age-related declines in gait, balance, and coordination in mice; by using designer receptors (DREADDs) to increase Purkinje cell activity in older animals, motor performance improved on tasks like the Rotarod and a string-pulling task, while decreasing activity in young mice worsened performance, establishing a causal role and offering a potential target to preserve mobility and reduce falls in aging (with implications for neurodegenerative conditions).
During brain development, migrating neurons experience mechanical stress as they squeeze through narrow spaces, triggering widespread DNA double-strand breaks without nuclear envelope rupture. Breaks arise from TOP2β–DNA cleavage complexes and are repaired mainly by non-homologous end joining; damage concentrates in transcriptionally inactive chromatin and retrotransposons. In mice with early Lig4 loss in migrating neurons, DSBs persist with mild transcriptional changes and age‑related motor deficits, suggesting developmental DNA damage can subtly affect brain function and disease risk.
New precision MRI work across 800+ participants reveals four cerebellar regions involved in language, including a right-posterior area that acts as a dedicated language satellite mirroring the neocortical language network. Most cerebellar regions also activate during non-linguistic tasks, suggesting the cerebellum helps integrate information across brain networks. The findings extend the language network into the cerebellum, with potential implications for language learning and aphasia therapy through non-invasive brain stimulation.
A study finds that shyness is linked to reduced spontaneous activity in the cerebellum, with this relationship being partly mediated by the Behavioral Inhibition System, highlighting the neural and motivational factors underlying shy behavior.
Recent research suggests that the ancient regions of the brain, such as the subcortex and cerebellum, may play a more significant role in consciousness than previously thought, challenging the traditional focus on the neocortex.
Recent research suggests that the oldest parts of the brain, such as the subcortex and even the cerebellum, may be sufficient for basic consciousness, challenging the traditional view that the neocortex is essential for conscious experience. Evidence from brain stimulation, injury, and rare cases of individuals without a neocortex indicates that consciousness might be more widespread and rooted in ancient brain structures than previously thought.
Recent research suggests that traditional theories emphasizing the neocortex's role in consciousness may be incomplete, as evidence indicates that ancient brain regions like the subcortex and cerebellum can support basic conscious experiences, prompting a reevaluation of our understanding of consciousness and its neural basis.
A study from UC Riverside links mitochondrial dysfunction to the loss of Purkinje neurons in the cerebellum, contributing to motor impairments in MS patients, suggesting that targeting mitochondrial health could help preserve motor control and balance.
Neuroscientists studying learning in mice have discovered "zombie neurons" in the brain, shedding new light on the learning processes in the cerebellum. Using optogenetics, they found that climbing fibers in the cerebellum play a key role in associative learning. However, introducing a light-sensitive protein zombified these neurons, preventing them from responding to sensory stimuli and blocking the animals' ability to learn. This research provides compelling evidence that climbing fiber signals are essential for cerebellar associative learning and raises questions about the 'zombification' of neurons and its implications for other forms of cerebellar learning.
A study by researchers at the University of Pittsburgh and Columbia University reveals that the cerebellum, traditionally associated with motor control, also plays a crucial role in reward-based learning and forming new visuomotor associations. By training monkeys to associate visual cues with hand movements for rewards, the study shows that blocking a specific region of the cerebellum impairs the ability to learn new associations, highlighting its contribution to cognitive functions. This discovery expands our understanding of the cerebellum's role beyond motor control and offers insights into addressing non-motor symptoms in individuals with cerebellar disorders.
Researchers have discovered "zombie neurons" in the cerebellum, termed as such because they are alive but functionally altered, shedding light on the brain's teaching signals and the role of climbing fibres in associative learning. The study utilized optogenetics to manipulate climbing fibres and found that they are crucial for cerebellar learning, as altering them created "zombie neurons" that could induce learning when directly stimulated but ceased to respond to traditional sensory stimuli. This research provides compelling evidence of the necessity of climbing fibre signals in cerebellar learning, advancing our understanding of brain plasticity and learning mechanisms.
Despite being long believed to primarily control movement, the cerebellum, containing three-quarters of the brain's neurons, is now suspected to regulate complex behaviors, social interactions, aggression, working memory, learning, and emotion. Recent research and clinical studies have revealed cognitive and emotional deficits in patients with cerebellar damage, challenging the traditional view of its function and prompting neuroscientists to explore its newly discovered roles beyond motor control.
Scientists from Johns Hopkins University School of Medicine have used Positron Emission Tomography (PET) and dinosaur fossil comparisons to uncover the role of the cerebellum in enabling bird flight. Their research revealed an adaptive growth in the cerebellum's size, indicating its involvement in the planning, steering, and learning of motor functions among fossilized vertebrates. The study also identified increased brain activity in optic flow pathways during flight. By comparing modern bird brain activity with dinosaur fossil documentation, the researchers traced the development of neural conditions for flight in avian ancestors. This discovery sheds light on the evolutionary history of flight and paves the way for further analysis of specific brain regions involved in flight readiness.
Scientists at Johns Hopkins Medicine have used PET scans of modern pigeons and studies of dinosaur fossils to determine that an increase in the size of the cerebellum played a crucial role in the evolution of bird flight. The cerebellum, responsible for movement and motor control, showed significant activity increases during flight in pigeons. By comparing this with the fossil record, researchers identified a growth in cerebellum volume in early maniraptoran dinosaurs, indicating the development of brain conditions for powered flight. This study sheds light on the brain's role in the evolution of flight among vertebrates and may lead to further research on the neural connections enabling a flight-ready brain.