Articles tagged with Brain Evolution
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Researchers discovered that a certain short-wave or blue sensitive cone circuit is absent in marmosets and differs from the macaque monkey's circuit. This finding suggests that humans have unique neural wiring for color vision that may be linked to recent evolutionary adaptations.
Large structural changes in human ancestors' genomes may have sparked smaller changes that set human brains apart from other primates. Researchers found that many enhancers, which regulate brain development, are located near these regions, suggesting a link between DNA folding and brain evolution.
A MedUni Vienna study examining the connection between brain structure and function found that brain shape evolved parallel to its capabilities. The research analyzed 90 species of Euarchontoglires, revealing clusters of growth patterns linked to cognitive abilities.
Researchers found that Indigenous populations with limited food availability have slower brain aging, while industrialized populations experience faster cognitive decline. Beyond a certain point, excessive energy gain from food intake is associated with smaller brain volumes and faster aging.
Researchers Pawel Burkhardt and Fred Wolf will study the simple nervous system of marine organisms to understand brain evolution. The project aims to reveal the neural network of ctenophores, a predator with an alien-like brain.
Researchers found that Tsimané and Mosetén adults experienced less brain atrophy and improved cardiovascular health compared to industrialized populations. These findings suggest an optimal lifestyle balance between daily exertion and food abundance may be key to healthy brain aging.
A review of evidence suggests that increased parental energy investment in young offspring may have facilitated the evolution of larger brains in some species. This is particularly true for warm-blooded species, which tend to invest more energy in their young through actions such as egg production and lactation.
Researchers from Ohio University and the University of Southampton reconstructed the brains and inner ears of two British spinosaurs to gain insight into their interaction with their environment. They found that the olfactory bulbs were not particularly developed and the ear was attuned to low-frequency sounds.
A study by Chinese Academy of Sciences researchers found that group-living mammals live longer than solitary ones, with a 100-fold variation in longevity among species. The team identified 31 genes and pathways linked to both social organization and lifespan.
A 319-million-year-old fossilized fish has provided the oldest example of a well-preserved vertebrate brain, shedding new light on the neural anatomy and early evolution of ray-finned fishes. The discovery reveals that brain evolution in these animals unfolded more complexly than previously thought.
Researchers found that many changes to human DNA had opposing effects, with some variants making enhancers stronger while others made them weaker. This discovery has implications for understanding human evolution and the potential link between human DNA variations and psychiatric diseases.
A new study on a 525-million-year-old fossil has shed light on the origin and composition of arthropod heads, resolving a century-old debate. The discovery of a delicately preserved nervous system in the fossil of Cardiodictyon catenulum, a tiny sea creature, suggests that the brain and trunk nervous system evolved separately.
A team of Duke researchers identified a group of human DNA sequences regulating genes that seem to have evolved rapidly after our family line split from that of the chimpanzees. These changes were fine-tuned over time and appear in brain development, digestion and immunity.
Researchers generated induced pluripotent stem cells and cerebral organoids from the last male Malaysian Sumatran rhino, enabling study of brain development and potentially aiding in breeding program. The technology holds promise for fighting extinction of critically endangered species.
Trinidadian killifish exhibit larger brain size in high-competition environments, increasing their ability to forage and survive. The study provides experimental evidence that brain size is an adaptive trait in dense populations.
A new study reveals that European moles reduce their brains by 11% in winter and regrow them by 4% in summer to conserve energy. This phenomenon, known as Dehnel's phenomenon, is driven by cold conditions rather than food shortage alone.
Paleontologists at the University of Malaga have found that humans uniquely combine increased brain size with a juvenile cranial shape. The analysis of four new hominid fossils and modern great ape samples shows changes in cranial development, including a negative growth of the neurocranium and a positive growth of the splanchnocranium.
Researchers produced human and chimpanzee brain organoids to investigate the role of ARHGAP11B in brain evolution. The study found that the gene is essential for neocortex development, with its absence or inhibition leading to decreased levels of critical brain stem cells.
A team of scientists generated a molecular atlas of the Australian bearded dragon's brain, comparing it to mouse data. The findings suggest that both reptilian and mammalian brains evolved clade-specific neuron types from a common ancestral set, challenging popular views on brain evolution.
A team of UNLV-led researchers questions the hypothesis that modern humans experienced an evolutionary decrease in brain size during the transition to complex societies. They analyzed a dataset of early human fossil and museum specimens, finding no reduction in brain size over 30,000 years.
Researchers found that woodpeckers do not absorb the shock of their beak impacts with trees, which contradicts the long-held theory of shock absorption. Their smaller brains can withstand deceleration shocks exceeding the concussion threshold for humans and monkeys.
A study comparing ancient lungfish fossils to modern brain structures reveals the evolutionary history of these ancient fish. The research suggests that lungfish relied on their sense of smell to navigate environments, unlike other fish that use sight more powerfully.
Fossilized brains of a 500-million-year-old marine predator, Stanleycaris, have revealed new insights into the evolution of arthropod brain structure. The two-segmented head and brain of Stanleycaris suggest that this trait may be more ancient than previously thought.
Researchers discovered that humans have expanded connectivity of language areas compared to chimpanzees, with new connections to frontal and parietal lobes. The study suggests that these unique connections may be crucial for human language abilities.
A recent study out of the Complexity Science Hub Vienna developed a mathematical and computational framework for analysing neural activity in C. elegans, a tiny worm used to study neural activity. The study proposes a way to unmask the roles of neurons by using more natural perturbations.
Researchers at UC Davis and UC Berkeley have mapped the full motor cortex of Egyptian fruit bats, showing that brain areas represent common synergies of muscles rather than individual muscles. This study highlights the unique motor control abilities of these bats, which use their tongue to echolocate and aim sonar beams.
Researchers found signs of concussions and head trauma in the brains of deceased headbutting muskoxen and bighorn sheep. The study provides insights into human injuries and opens the possibility that studying these animals could help researchers understand and reduce traumatic brain injuries.
Vervet monkeys have excellent cognitive skills for quickly appraising social context and planning routes accordingly. They make complex, multifactor decisions that consider contextual information, such as individual skill, rank, and competitor distance.
A study published in Current Biology found that consuming non-essential amino acids can curb appetite and encourage physical activity in mice. This mechanism is thought to be rooted in evolutionary history, where eating these amino acids promoted the urge to seek out more nutrient-rich food sources.
A University of Essex study found that people subconsciously attribute happiness to women and anger to men, with emotion influencing sex perception more than vice versa. The research suggests this bias may be an evolutionary advantage.
A comprehensive analysis of brain cellular composition across amniotes shows that mammals and birds have dramatically increased neuron numbers in the telencephalon and cerebellum, associated with higher cognition. The study suggests that only a handful of unique evolutionary events augmented brain processing power in these groups.
A large study comparing the brains of left-handers and right-handers found significant differences in brain asymmetry across ten regions. The research also discovered a link between genetic influences on handedness and brain asymmetries in language-related regions.
Researchers discovered mosaic brain evolution in guppies through an artificial selection experiment. This phenomenon indicates that different brain regions evolve independently in response to environmental demands. The study has significant implications for understanding vertebrate and human brain evolution.
Researchers found that human brains decreased in size around 3,000 years ago, coinciding with the expansion of collective intelligence and social groups. This decrease was linked to a reduction in brain energy use due to the externalization of knowledge.
Researchers have identified a gene called Nup54 that plays a crucial role in regulating female reproductive behaviors in fruit flies. This discovery provides new insights into the molecular mechanisms underlying sexual conflict and its impact on evolution.
A research team identified H3 acetylation as a crucial factor in human brain development, leading to the unique neocortex structure. This finding could pave the way for new treatments for neurodegenerative diseases by manipulating basal progenitor cell proliferation.
A recent study has identified nearly half of the fastest-evolving human genes as playing a crucial role in rewriting the course of human brain development. The research used an innovative approach called CaptureMPRA to analyze the function of Human Accelerated Regions (HARs) in regulating gene expression in the brain.
Rare fossils from the Cambrian period confirm the presence of an ancestral frontal domain in arthropods, which gives rise to crucial neural centers involved in decision-making and memory. The discovery also sheds new light on the evolutionary origin of visual systems in arthropods.
A recent study suggests that near-death experiences (NDEs) in humans may be linked to evolutionary mechanisms, specifically thanatosis - the phenomenon of death-feigning or tonic immobility. This defense mechanism is thought to have arisen as a survival strategy in animals and has been preserved across various species, including humans.
The study reveals complex patterns in brain-body scaling, with many large-brained species having low relative brain sizes due to selective pressures. The authors conclude that the evolution of intelligence cannot be solely measured by brain size.
Researchers found that birds and non-avian dinosaurs had similar brain sizes before the mass extinction, but after, some bird families evolved large-brained birds by shrinking body size. Parrots and corvids, including crows, showed exceptional cognitive capacity and rapid brain evolution.
Researchers have found a precursor to the human language pathway in living primates, illuminating an earlier evolutionary origin of at least 25 million years. The study reveals a segment of the language pathway that interconnects the auditory cortex with frontal lobe regions, important for processing speech and language.
A three-million-year-old brain imprint reveals that Australopithecus afarensis infants may have relied on caregivers for a prolonged period. The study found no evidence of human-like brain reorganization, but suggested protracted brain growth similar to modern humans.
A new study published in Science Advances used CT-scanning technology to view fossil skulls of Australopithecus afarensis and shed light on the evolution of brain organization and growth. The research reveals that while Lucy's species had an ape-like brain structure, the brain took longer to reach adult size.
Researchers at Karolinska Institutet have discovered a detailed blueprint for the development of the human cortex in the ancient lamprey brain, shifting its origin to over 500 million years ago.
A team of neurosurgeons has discovered the origins of the homunculus, a famous brain concept devised by Wilder Penfield. The study reveals that the iconic map was created from Edwin Boldrey's 1936 thesis, which analyzed electrical brain stimulations in human surgery.
Researchers found that human brains evolved independently of changes to the braincase, despite both being affected by bipedalism. The study used CT and MRI data to quantify spatial relationships between brain structures and cranial structures.
Research by Marco Del Giudice reveals parasites manipulate host behavior to increase transmission chances and alter neural functioning. Hosts evolve countermeasures to evade manipulation, but these adaptations may also create new vulnerabilities.
The guidelines for managing severe traumatic brain injury continue to evolve as new evidence emerges, emphasizing the need for high-quality research and clinically applicable recommendations. Key challenges and goals for the future include generating more robust evidence and translating it into effective patient care.
A study found that brain size in offspring is associated with paternal care, while higher fertility is linked to alloparental care from non-biological parents. This suggests that energy inputs from different caregivers may impact brain development and reproductive output in mammals.
A recent study published in JNeurosci analyzed brain scans from over 600 children and adolescents, revealing genetically-mediated associations between brain region size and intelligence. The research suggests that evolutionary expansion of the human brain is largely under genetic control.
A new study on turtle brain evolution reveals that their brains have changed slowly and constantly over 210 million years, with modern turtles showing a wide variety of brain shapes and sizes. The first turtles with fully formed shells were likely living on land, contradicting previous hypotheses about their origins.
Researchers found that the modern human brain shape developed gradually within the species, with fossils showing a transition from elongated to globular shapes between 100,000 and 35,000 years ago. This evolution was independent of brain size and was accompanied by changes in early brain development.
A new study provides insight into the CLOCK gene's vital role in regulating human-specific genes important to brain evolution. The findings suggest that CLOCK regulates genes linked to cognitive disorders and has an important role in human neuronal migration, a process crucial for brain development.
A Yale-led study found distinct differences in human brain regions, including a unique gene expression pattern in the striatum and higher levels of MET in the prefrontal cortex. These findings suggest that the human brain's cognitive abilities may be linked to specific genetic variations.
Researchers discovered that early sauropod dinosaurs like Saturnalia tupiniquim were capable of a bipedal gait and had agile ancestors. The brain structure of S. tupiniquim revealed specific features enabling it to track moving objects with its eyes, execute rapid movements of its head and neck in a coordinated fashion.
Researchers propose adaptive capacity model to understand exercise-brain connection, suggesting physical activity impacts brain structure and function from evolutionary history as hunter-gatherers. Exercise may enhance cognitive abilities and prevent age-related decline or neurodegenerative diseases like Alzheimer's.
Researchers found that Acheulian tools required integration of visual working memory, auditory information, and complex action-planning - similar brain areas activated in modern piano playing. This suggests that language may not have played a crucial role in the evolution of early stone tool production.
A recent study published in PNAS found that adult humans' subcortex can process numbers at the same level as infants and other lower-order species. The researchers used a stereoscope to present visual stimuli to one eye or both eyes and observed that numerical judgments were better when the quantities differed greatly.
Researchers found that brain size evolved at different rates for different species, especially during Homo's evolution, while chewing teeth evolved at similar rates. This challenges the classic view that larger brains led to smaller teeth as a result of tool use.