A recent study published in Psychological Science reveals that consonants play a crucial role in distinguishing between words, while vowels carry grammatical information. The researchers found that listeners are sensitive to this difference and can compute statistical relations among vowel sounds but not consonant sounds.
A new experimental vaccine has shown promising results in protecting nonhuman primates from Lassa fever. The vaccine, developed using a non-pathogenic form of vesicular stomatitis virus as a carrier, has been successfully tested with all vaccinated monkeys surviving infection.
Researchers induce indefinite organ allograft survival in rhesus monkeys by stimulating recipient T cells with donor cells, generating immunosuppressive anergic T cells. These cells suppress renal allograft rejection without additional immunosuppressive agents.
A study published in the Journal of Clinical Investigation shows that reinfusing anergic T cells into rhesus monkeys after kidney transplantation leads to prolonged and potentially indefinite graft survival without additional immunosuppressive agents. This approach has shown promise for improving organ transplantation outcomes in humans.
A recent study using ancient DNA has confirmed that all living lemurs on the island of Madagascar descended from a single primate ancestor. The researchers analyzed DNA from nine subfossil individuals and found that they are closely related to living indriids, but not to other extinct species.
Researchers have developed a new vaccine that is 100 percent effective in protecting monkeys from infection with deadly viruses Ebola and Marburg. The vaccine targets dendritic cells, which are the same cells attacked by these viruses.
Researchers have discovered two new retroviruses, HTLV-3 and HTLV-4, transmitted from animals to humans through contact with primate blood and body fluids. The study highlights the importance of surveillance among bushmeat hunters and the need for further research into disease outcomes and potential human-to-human transmission.
Researchers found that 12.9% of wild chimpanzees carry Ebola virus antibodies, indicating regular contact with the animal reservoir and non-fatal infections. Dogs also carry the virus, with high antibody prevalence near epidemic foci, suggesting they could become a potential source of infection for humans.
Research by Marino and colleagues reveals that dolphins and primates share similar cognitive abilities despite their distinct brain development patterns. The study, which spans 47 million years, uses magnetic resonance imaging and fossil records to compare the encephalization of cetaceans and humans.
Researchers found evidence of the first elephant shrews' presence in North America, suggesting a greater animal migration than previously thought. This discovery has significant implications for our understanding of mammalian evolution and the history of continental breakups.
Researchers found that stimulation of the posterior parietal cortex elicits complex, innate behaviors such as aggressive facial patterns and hand-to-mouth movements in primates. This discovery suggests that these behaviors are built-in to primate brains, including humans.
Researchers at Washington University in St. Louis have successfully sequenced a fossil human protein from over 40,000 years ago, providing valuable information on human evolution and diet. The analysis reveals that the Neanderthal sequence is identical to modern humans', suggesting a shared dietary history.
Researchers found that older male nonhuman primates' spatial memory declines at a greater rate than females, suggesting sex differences in age-related cognitive decline. The study aims to investigate factors contributing to these differences and potentially inform the development of sex-specific therapies.
The study used combined PET and MRI to track cocaine pharmacokinetics in pregnant nonhuman primates. The results showed that cocaine accumulated at the highest levels in the liver, and to a lesser extent in the brain, suggesting a unique anatomy of fetal circulation.
A study estimates that a person would need to eat at least 1.5kg of neural tissue from an infected animal to be at risk of developing vCJD. The investigation found the efficiency of infection from cow to primate could be 7-20 times lower than intraspecies infection for cattle.
Researchers find chimpanzees' responses to unfair situations depend on the strength of their social connections. In a study, chimpanzees in long-term groups were less likely to react negatively to unfair situations compared to those in short-term groups.
A study published in the Royal Society journal found that chimpanzees' tolerance for inequity increases with their social closeness, mirroring human responses based on relationship quality. This suggests a link between social connections and the sense of fairness in non-human primates.
Researchers successfully transplanted monkey embryonic stem cells to reverse Parkinson's disease symptoms in primates. The study demonstrated the potential of this approach to treat neurodegenerative diseases, despite low survival rates of transplanted neurons.
In a groundbreaking study, researchers confirmed that wild capuchin monkeys in northeastern Brazil routinely crack open palm nuts using heavy stones. The behavior was previously observed only in chimpanzees and other primates. This finding expands our understanding of tool use among non-human primates.
Scientists have successfully cloned primates up to the blastocyst stage, a developmental milestone for embryonic stem cell research and potential treatments for diseases such as diabetes and Parkinson's. The breakthrough could pave the way for deriving human embryonic stem cells from nonhuman primate templates.
Research reveals chimpanzees' brain anatomy is asymmetric in key areas, particularly the hippocampus, similar to humans. This finding suggests that asymmetry may be a fundamental aspect of primate nervous systems and influences behavior, such as facial expressions and spatial memory.
A study found that 23% of zoo workers handling primates showed reactivity to the SV40 virus, but most reactions were likely due to cross-reactivity with other polyomaviruses. The study suggests occupational exposure to SV40 among those working closely with nonhuman primates.
A study on bats revealed a key region of growth plate that allowed digits to grow longer, suggesting rapid evolution. Genetic studies show that bats are closest to ferungulates, not primates or shrews.
Researchers found a clear correlation between female promiscuity and rapid evolution of the semenogelin protein in various primate species. This suggests that intense sexual competition drives genetic adaptation, with genes evolving faster in species with more promiscuous females.
A USC study found that the brain processes rhythmic and discrete movements differently, with distinct activity patterns in different brain areas. The research has implications for movement control and rehabilitation, as well as our understanding of music's effect on human movement.
A genetic variant associated with increased heart disease risk emerged rapidly in the ancient European population around 24,000 years ago. The high-expression variant is linked to a mutation hotspot in MMP-3's regulatory DNA.
Researchers discovered over 2,200 new human-specific Alu DNA repeats not found in chimpanzees, suggesting an explosive expansion of genetic code. This finding contradicts the idea of natural selection and highlights a chemical process driving human evolution.
A study published in Vision Research found that the size of animals' eyes is linked to their body weight, with larger animals having bigger eyes on average. However, when broken down into smaller groups, such as birds and primates, eye size becomes more complicated and varies greatly.
Researchers discovered that a human protein called Apobec3G began evolving to defend against viruses in primates over 30 million years ago, suggesting HIV is a newcomer to this conflict. The study provides insights into the genetic mechanisms of HIV prevention and potential new targets for treatment.
Researchers at OHSU have discovered a possible method for early detection and prevention of premature birth by identifying biomarkers associated with intra-amniotic infections in both animal and human studies. The breakthrough technology has the potential to save young lives and may lead to significant health benefits.
A study reveals that the APOBEC3G gene, which edits DNA and RNA to prevent viral replication, has been under strong positive selection for 33 million years. This ancient defense mechanism may have evolved to counter human endogenous retroviruses before HIV existed.
Researchers at Duke University found that ringtails and mongoose lemurs can learn sequences of pictures and discriminate quantities. The animals show a systematic learning ability and can recognize larger quantities, but their numerical abilities are not as sophisticated as those of monkeys and apes.
Researchers developed a DNA vaccine that protected nonhuman primates from both smallpox and monkeypox, offering a safer alternative to existing live virus vaccines. The vaccine used four genes from vaccinia virus and was shown to elicit a robust immune response in primates.
A new study provides support for the ancient origin of the MT visual center in primates, suggesting it evolved early in primate evolution. The researchers used optical imaging to analyze the brain structure of a small nocturnal primate called the galago and found similarities with monkey brains.
Researchers discovered a myosin gene mutation that correlates with anatomical changes in early hominid fossil record, including smaller jaw muscles and larger brain size. The mutation, estimated at 2.5 million years ago, may have lifted an evolutionary constraint on brain growth in early humans.
Researchers found simian foamy virus (SFV) in 1% of Cameroonian villagers, linked to hunting and butchering primates. The study suggests retroviral zoonosis is widespread, highlighting the need for economic alternatives to reduce human-primate contact.
Studies of rural communities in Cameroon found that people exposed to blood or body fluids from primates during hunting have a higher risk of simian retrovirus infection. Genetic analysis revealed three geographically independent human infections, acquired from different primates.
A team of scientists has successfully tested a new smallpox vaccine that shows promise as an alternative to the existing Dryvax vaccine. The MVA vaccine was found to elicit equivalent or higher immune responses in nonhuman primates, providing protection against monkeypox.
Chiu presented her research on correlating gene changes with limb structure, a topic of interest to paleoanthropologists. By studying the mouse, she found that significant developmental differences are due to changes in gene regulation.
Scientists have successfully grafted primate testes into mice, resulting in the rapid production of fertile sperm. This breakthrough could preserve genetic material from endangered nonhuman primates and offer reproductive options to men rendered infertile by cancer treatments.
A recent study found a correlation between the loss of olfactory receptor genes and the acquisition of full trichromatic color vision in primates. The research team analyzed 19 primate species, including humans, and discovered that Old World monkeys and apes had similar percentages of OR pseudogenes, while New World monkeys had lower p...
A new primate fossil find in Asia has sparked debate about the origins of humans, with some scientists arguing that early primates were nocturnal. The fossil, Teilhardina asiatica, is smaller than modern primates and had sharp tooth cusps indicating an insect-eating diet.
A new drug, rNAPC2, has shown promising results in treating Ebola by slowing coagulopathy and death in primates. The treatment targets the disease process rather than replicating the virus, offering a potential breakthrough in combating the deadly disease.
A recent study by Dario Maestripieri found that young monkeys reared by a mother other than their own exhibit the aggressive or friendly behavior of their birth mothers, rather than foster mothers. This suggests that inherited behavioral predispositions may play a more important role in shaping social behavior in primates.
Researchers at the US Army Medical Research Institute of Infectious Diseases have developed a hantavirus vaccine that elicited a potent neutralizing antibody response in rhesus macaques. The vaccine, which uses a naked DNA approach, also provided protection against hamster infection when administered after exposure.
Researchers found that brown capuchin monkeys refused previously acceptable rewards if they witnessed their partners receiving higher-value rewards for equal or less work. This study provides insight into how humans develop emotional reactions to fairness in economic interactions.
Scientists at the Pittsburgh Development Center are working towards cloning nonhuman primates, overcoming fundamental molecular obstacles first reported in 2003. The goal is to generate at least 10 cloned nonhuman primates and produce identical offspring through embryo splitting for studying human diseases.
Researchers compared genomic regions in 13 vertebrate species, including humans and zebrafish, to identify conserved non-coding sequences with biological roles. The study provides insights into the understanding of our own genome and highlights the importance of sequencing multiple species' genomes.
Research suggests that early hominids lived in a more cooperative society than previously thought, with minimal sexual dimorphism and cooperating male behaviors. This challenges the idea of fierce competition among primates and instead reveals a social structure similar to modern humans and chimpanzees.
A new theory on aging, proposed by Ronald D. Lee, suggests that natural selection favors animals capable of devoting energy to insure survival of the next generation. This theory attempts to fill in gaps of previous ideas on aging and its relationship with nurturing behavior.
Research by University of Michigan biologist Jianzhi Zhang found that humans lost pheromone signals after a gene duplication event around 23 million years ago. This duplication allowed for the development of color vision, making pheromones unnecessary as a channel for sexual signaling.
Scientists at the University of Pittsburgh Medical Center found that chromosomal problems exist within each individual cell, leading to developmental abnormalities. The study suggests that current techniques used for reproductive cloning do not work in nonhuman primates.
Newly discovered primate fossils in Egypt double the known age of bushbabies and lorises, suggesting they may have originated in Indo-Madagascar instead of Africa. This finding pushes back the divergence times and origins of primates, including human ancestors, to around 90 million years ago.
Fossil teeth from Egypt's Fayum desert have provided evidence of the earliest known ancestors of bushbabies and lorises, dating back to the Eocene epoch. The finds confirm earlier genetic studies suggesting that these primates diverged much earlier than previously thought.
A study found that 54% of human olfactory receptor genes are impaired, compared to 28-36% in other primates. The decline of the sense of smell likely occurred within an 'evolutionary moment' 3-5 million years ago.
Researchers studied sooty mangabey monkeys infected with SIV, finding they didn't get sick like humans with HIV. The lack of symptoms was attributed to low-level immune system responses and ability to maintain T cell renewal.
A new USC study suggests that humans lost the ability to detect pheromones due to a gene essential for vomeronasal organ function. The study found that mutations in this gene occurred around 40 million years ago, leading to the disappearance of the gene and subsequent loss of vomeronasal organ function in primates.
Researchers found significant genomic rearrangements in human and non-human primate DNA, suggesting a new source of variation between species. These findings may provide insights into human health and disease, and could inform targeted investigations of gene expression differences.
Scientists have developed a powerful new technique called phylogenetic shadowing, enabling them to study biological traits unique to the primate family. This allows for better understanding of humans by comparing with apes and monkeys.
The behavior of punishing others for their injury is widespread in the animal kingdom, with humans adding a conscious sense of what to achieve through revenge. This leads to complex social rules governing who can be targeted and when, often prioritizing balance over personal relationships.