Articles tagged with Olfactory Perception
Researchers found that prolonged exposure to one odorant improves differentiation among related odors and reveals increased response in brain areas. The study suggests that humans naturally learn to identify thousands of different smells through experience-dependent neural plasticity.
Researchers at Vanderbilt University discovered that some mammals, such as star-nosed moles and water shrews, can detect objects underwater using their sense of smell. By blowing bubbles into the water, these animals can create a rapid exchange of air molecules that allows them to sniff out objects with high accuracy.
Tiny airborne particles, similar to nanoparticles, follow a rapid and efficient pathway from the nasal cavity to various regions of the brain in rats. The study found increased gene expression signaling inflammation and cellular stress response, but it is unclear if ultrafine particle buildup causes brain damage.
Taking slightly longer to smell an odor can lead to more accurate identification, a discovery that sheds light on the brain's olfactory processing. The study, published in Neuron, reveals a clear relationship between sampling time and accuracy, implications for understanding human olfaction.
In a breakthrough study, researchers found that nerve cells in the olfactory bulb detect individual chemical compounds in odors, rather than perceiving complex mixtures as single objects. The brain integrates these signals to form a recognizable scent, much like combining multiple melodies to hear a symphony.
Researchers present new discoveries on topics ranging from molecular biology to clinical diagnosis and treatment of smell and taste disorders. Key findings include zebrafish exhibiting robust light responses, flavor and fragrance scientists working to uncover basic science behind sensory delights.
In a series of experiments, female mice were exposed to odors of either a male mouse alone or a male mouse with a female. The females consistently preferred the scent of males linked to other females. This finding suggests that female mice may use social cues, such as olfactory information, to inform their mate choice.
Researchers at Case Western Reserve University have identified a new cell type called Blanes cells that play a critical role in shaping the output of the olfactory system. These cells selectively communicate with granule cells, leading to a disproportionate impact on the olfactory system's functioning.
Olfactory sensory neurons expressing the MOR23 odor receptor responded differently to lyral concentrations and reaction times varied between 500 milliseconds and five seconds. The study adds a new layer to understanding the olfactory system's response to odors, suggesting finer-tuned responses in the brain.
A University of Toronto study has ruled out the theory that duck-billed dinosaurs' crests were linked to their sense of smell. The research, led by David Evans, found that the brain changed little from non-crested dinosaur ancestors, suggesting the crests may have been used for visual display or attracting mates.
Researchers found that fruit fly species D. sechellia develops a specialized olfactory system to detect the morinda fruit, which is toxic to other species. This unique system involves increased numbers and sensitivity of specific olfactory hairs, suggesting an evolutionary adaptation in just a limited time span.
A new study published in Nature Neuroscience found that male mice require intact functioning of the main olfactory epithelium (MOE) to detect pheromones that elicit sexual behavior and fighting. The MOE plays a crucial role in regulating mating and aggression in mice, highlighting the importance of this sensory system.
Researchers found that newly generated olfactory neurons in the adult brain can specialize in detecting previously unencountered odors and respond strongly to those smells. This suggests a unique role for these new cells in learning and memory functions, which may be important for repairing diseased brain tissue.
Scientists used a genetically altered virus to trace connections between olfactory neurons and LHRH-producing neurons in mice. They found that the main olfactory epithelium sends signals to LHRH neurons, controlling puberty, ovulation, and testosterone production. The study challenges traditional views on pheromone communication systems.
Researchers found that almost all neurons feeding into the LHRH-making region of the hypothalamus originated in the mouse nose. Mice with compromised olfactory function show dramatically impaired mating behavior, highlighting the essential role of olfactory activity in eliciting male mating behavior.
Researchers at UC Berkeley found that humans can reliably discern the source of an odor when presented with it through one nostril. The brain's primary olfactory cortex is divided into separate areas for each nostril, allowing for accurate localization. This ability has implications for various fields, including truffle hunting.
Researchers found that brain responds differently to odors introduced through the nose versus the mouth, with distinct brain regions activated. The study suggests that olfactory referral illusion is robust and cognitively impenetrable, and may play a role in flavor perception.
Researchers found evidence that specific variants of a bitter-taste receptor gene were strongly favored in early human evolution, leading to increased sensitivity to toxic compounds. This suggests a pivotal role for bitter-taste perception in toxin avoidance in humans.
Newborn rats' brains show decreased NMDA receptor activity in olfactory-deprived side, leading to increased neuronal activation and saliency of early odors. This critical period affects olfactory development and learning.
Researchers at Vanderbilt University aim to develop powerful chemical repellents and attractants to interfere with malaria mosquitoes' ability to find human targets. The project uses genetic engineering, molecular biology, and field-based studies to establish an effective strategy for reducing malaria spread.
The study found that individual odors stimulate a small subset of neurons across a large area in the cortex. Different odorants exhibit similar patterns of activation, but with partial overlaps. This suggests a complex logic to the way information is mapped onto the cortex.
Subjects rated odors more pleasant when labeled with positive words like 'cheddar cheese', whereas unpleasant labels had the opposite effect. The study also found that brain regions processing odors were activated by word labels, highlighting high-level cognitive inputs' impact on sensory perception.
Researchers found that sensory deprivation reduces the size of new interneurons in the olfactory system but compensates with increased excitability. This preserves the function of interneurons in processing input if restored.
Researchers have discovered that an ancient olfaction protein is shared by many insects, including fruit flies, medflies, and mosquitoes. This finding suggests a high degree of evolutionary conservation of the protein's function in detecting odors, which could be exploited for developing novel pest control methods.
Bees' brains process scents in a complex system that correlates with behavioral responses, suggesting a species-specific code for odor recognition. The study's findings improve understanding of animal perception and memory, paving the way for further research.
Scientists have discovered a gene responsible for an insect's sense of smell, which is highly conserved across four different species, including pests that target crops and human health. This finding could lead to the development of new pesticides and disease-controlling insect repellents by targeting the insects' sense of smell.
Land-living crabs, descended from marine ancestors, have developed a sophisticated sense of smell similar to insects. The robber crab's olfactory system is highly sensitive and has adopted strategies used by insects to navigate its air-filled terrestrial environment.
A team of researchers at UT Southwestern Medical Center has discovered the biochemical mechanism by which insects detect pheromones. They found that a specific protein, called an olfactory binding protein, is essential for translating pheromone signals into behavioral responses.
Scientists discovered pigeons have a magnetic sense beyond simple compass, supporting theory that birds use magnetic map to navigate. The study found magnetic receptors located in the nasal region and suggests magnetite-based ability.
Researchers discovered two proteins that chaperone odorant receptors to the surface of olfactory nerves in mice, enabling them to match nearly 1,000 different mouse odorant receptors with specific chemicals. This breakthrough opens up new possibilities for understanding the mechanisms underlying our sense of smell.
Researchers transplanted adult olfactory bulb stem cells into genetically engineered mice with ALS, showing a significant delay in disease symptoms and improved functional outcomes. The study suggests these stem cells may hold potential for treating ALS, but further laboratory work is needed.
Research reveals that human olfactory receptor hOR17-4 is expressed on both human sperm cells and olfactory neurons, suggesting a dual capacity for chemosensory functions. This discovery has implications for understanding fertility defects associated with olfactory receptor-dependent chemotaxis in sperm.
Researchers found that a specific smell receptor, Or83b, is crucial for insects' sense of smell, allowing it to detect human hosts. Blocking this gene could lead to the development of more effective insect repellents.
Researchers have found that people with the rare genetic disorder BBS syndrome are unable to detect odors due to faulty cilia in their olfactory system. The study, led by Johns Hopkins Medicine researchers, used mice models to prove that ciliary problems caused by BBS-causing genes lead to impaired sense of smell.
Researchers at Duke University have been studying ring-tailed lemurs' scent language to understand their complex chemical communications. The scientists found that lemurs use 'scentences', combinations of scents extending their chemical messages, and identified specific compounds in their scent profiles.
Researchers at Yale University have created a detailed map of the relationship between odor receptors and neurons in fruit flies. The study reveals that different receptors respond to varying numbers of odors and can even be inhibited by certain smells, providing valuable insights into the human olfactory system.
The study established four principles of olfactory system development: without sensory activity there is no full maturation, a sensitive period influences organization maturation, sensitive periods occur at different times for different receptors, and glomeruli may be innervated by multiple nerves during early development.
Olfactory sensory neurons can adapt to odorant stimulation, but the ability to enhance long-term survival after stimulation has been unclear. Researchers found that odorants stimulate the Erk/MAP kinase/CREB pathway, leading to cell survival and dynamic long-term adjustment to sensory information.
A study of 445 patients with chronic olfactory dysfunction found a significant link between impaired sense of smell and an increased risk of cooking-related incidents, gas leaks, and fire detection. Otolaryngologists must be aware of these risks to provide proper diagnosis and counseling for patients.
Researchers found a link between olfactory dysfunction and excess tau proteins in brain structures important for smelling. The study used genetically engineered mice to evaluate the effect of tau protein overexpression on smell perception.
Researchers successfully cloned mice from olfactory cell nuclei, demonstrating totipotent development and normal brain function. The study expands understanding of neuronal diversity and offers insights into reprogramming mature cells.
Scientists at Vanderbilt University have verified that female Anopheles mosquitoes contain receptors responding to one of the chemical compounds found in human sweat. This discovery may lead to better ways to repel deadly insects and uncover additional chemicals that either attract or repel them.
Researchers found that odor working memory is impaired by aging, while semantic memory remains relatively intact. The study suggests that different brain regions handle working and semantic memory, which may explain why odors are more vulnerable to age-related decline.
Researchers studied neurons in the olfactory bulb and found that they only undergo subtle changes in response to environmental stimuli. These findings challenge previous theories of brain rewiring and may offer insights into disorders such as epilepsy and Alzheimer's disease.
Researchers at North Carolina State University found that changes to genes regulating olfactory behavior in fruit flies have far-reaching implications. The study used a model organism to quantify the extent of ripples in the genome affecting behavior, revealing that two-thirds of affected genes impact olfactory behavior.
Weizmann Institute scientists found that around 50 genes are optional, affecting a person's unique pattern of active olfactory receptors. This high level of genetic variation impacts how thousands of aromas and flavors are perceived. The study also shows varying levels of obliteration among different ethnic groups.
A study found that depressed patients' brains respond differently to smells and visual stimuli compared to healthy individuals. The researchers suggest that alterations in the orbitofrontal cortex and amygdala may contribute to the reduced sense of smell and intensified emotions in depression.
Scientists propose a new mechanism for passing information through cell membranes via a shuttlecock motion involving metalloproteins. This theory explains why dietary zinc deficiencies lead to a loss of smell and has significant implications for understanding the sense of smell.
A new study reveals that the human brain can distinguish between thousands of chemicals using a 'fingerprint' pattern, while another discovery sheds light on pheromone-detecting neurons in mice that identify potential mates and social status. These findings may also aid in understanding animal communication and behavior.
Researchers found a specific neural structure processes pheromonal signals, governing mating and social behaviors. The 'pheromonal image' is akin to the visual 'face neurons' that recognize facial features.
Researchers discovered that palm leaves emit specific floral notes to attract pollinating weevils during the flowering season. This finding suggests a shift in flower-to-leaf function in plants, opening new questions about pollination system evolution.
Researchers believe olfactory ensheathing cells from the nose hold potential to repair spinal cord injuries. These cells can be obtained from adult donors and offer a possible auto-transplantation method, resolving tissue availability issues.
A new study confirms that binge drinking can cause neuronal damage in the brain. Damage to the olfactory bulb occurred after just two days of 'binge drinking', while other regions were damaged after four days. The study suggests that alcohol-induced brain damage occurs during intoxication, not withdrawal.
Researchers from the University of Warwick, Leicester, and Edinburgh are developing a nanotechnology-based electronic nose that mimics human olfactory sensors. The device aims to improve the sensitivity and processing power of existing electronic noses, allowing for real-time monitoring of environmental pollutants and food safety.
A protein in an insect's antenna picks up chemical signals called pheromones and changes its shape to eject them onto sensitive nerve endings. This discovery could lead to the development of insecticides that prevent insects from detecting other chemical signals, essential for their survival.
Researchers at Vanderbilt University have identified four genes in the Anopheles gambiae mosquito that code for odorant receptors similar to those found in fruit flies. These genes are only expressed in the antennae and maxillary palps, indicating that mosquitoes use a conserved chemosensory system to track human body odor.
Researchers found that women taking oral contraceptives showed no change in their ability to detect odors, compared to the natural clime of the luteal phase. The study suggests that iatrogenic steroids may affect changes in smell sensitivity, and further research is needed to investigate this phenomenon.
Scientists at Emory University Health Sciences Center have discovered that the oxytocin gene is necessary for forming social memories, allowing individuals to recognize familiar faces. The study found that mice lacking this gene exhibited social memory deficits, which were restored with oxytocin treatment.
Researchers at Cornell University have developed a standard spectrum of smell to identify individuals with specific anosmia, which can distort data in sensory research labs. The new approach uses gas chromatography olfactometry to categorize people into three sensitivity levels: hyperosmic, hyposmic, and anosmic.
Neurobiologists at Duke University Medical Center have captured the first detailed images of the living brain in action, revealing how it recognizes specific odor molecules. The imaging technique can provide new insights into the machinery of learning and help decipher the brain's internal 'language' of smell.