Articles tagged with Olfactory Perception
Researchers at Washington University in St. Louis have found that serotonin increases the amplitude of neural responses to food-related odors in locusts, while ignoring non-food smells. This discovery sheds light on how sensory signals are processed and could inspire solutions for odor detection in toxic environments.
A study from the University of California, Berkeley, shows that nematodes react to pathogenic bacteria by destroying mitochondria to protect against iron-stealing bacteria. This protective response suggests that humans may also respond to the smell of pathogens to prepare their gut for infection.
A recent study published in Nature Communications found that mammals with more developed brains tend to exhibit smaller sexual size dimorphism (SSD), meaning there is less difference in size between males and females. This suggests that complex brain development may be linked to other traits such as social behavior and mate selection.
Researchers analyzed underarm odour samples from 29 women over a menstrual cycle, finding no evidence that men prefer fertile days. Chemical analysis also showed no correlation between odour composition and fertility status.
A new study reveals that traffic-related ultrafine particles hinder mitochondrial functions in human olfactory mucosa cells, impairing oxidative phosphorylation and redox balance. Individuals with Alzheimer's disease showed altered responses to UFP exposure.
A new study by researchers tracked how French infants aged four to 12 months use their mother's scent to perceive faces. The ability to perceive faces greatly improves between four and 12 months, with younger infants benefiting the most from the presence of their mother's odor.
Researchers discovered that a particular sweet chemical in vanilla and almond aromas could explain the change in perceptions, along with individual sensitivity. The study also found that spatial perception played a significant role in how people smell aromas in isolated settings.
Researchers from the University of Konstanz discovered that locusts adapt their sense of smell when they switch to a gregarious lifestyle. This adaptation allows them to better detect food odours in the swarm's complex environment, enabling them to find food despite being in a crowded swarm.
Scientists at Kyushu University created QDyeFinder, an AI pipeline that untangles the dense neuronal networks in the brain. The system uses a super-multicolor labeling protocol to tag neurons and then automatically identifies their structure by matching similar color combinations.
The study reveals a unique, ring-shaped organization of the antennal lobe, with specific glomerular clusters encoding different odors. This coding mechanism differs from other insects and vertebrates, with the representation of odor valence encoded in higher brain centers.
Research at the University of Zurich reveals that the first week after birth is a critical period for the development of senses, particularly smell and touch. Olfactory stimuli can induce neural activity across multiple brain regions, including areas responsible for non-olfactory sensory processing.
A survey of over 5,800 patients with impaired smell or taste identified a need for larger-scale clinical trials and personalized treatment approaches. The findings also revealed that age is a significant predictor of treatment effectiveness, with older adults reporting lower efficacy rates.
Insects like fruit flies use simple, efficient systems to recognize odors. Researchers found that paired olfactory receptor neurons in fly antennae facilitate computations in the central brain through pre-processing stage.
A newly discovered connection between two brain regions may help regulate how much we eat, according to a Northwestern University study. The weaker the connection between these regions, the higher a person's BMI, suggesting that individuals with weak brain circuits may overeat even when full.
Researchers propose expanding research on nature's scents and olfactory cues to better understand their impacts on human health. The study aims to investigate the complex links between smell, nature, and human well-being, including the potential for unconscious biochemical processes.
Identical odors are processed differently in the brain based on their assigned labels, according to new research. The study found that participants rated odors with different names as more dissimilar than those labeled with the same name.
A new study confirms the positive impact of image-based scented products on consumers, with relevant images scoring better in product evaluations. Adding specific images like cut lemons can magnify the olfactory impact, making it a cost-effective alternative to fragrance infusions.
Researchers found that our brains analyze submolecular features when we smell, leading to changes in perception over time. This dynamic adaptation affects the way our brains represent smells, making them less consistent than previously thought.
A recent study conducted by the University of East Anglia found that over a third of people with smell disorders have experienced gas safety scares in the last five years. The research also showed that 32.2% of respondents had encountered safety concerns related to food, while 14.8% experienced gas incidents involving hurt individuals.
Researchers found a direct link between loss of smell and decreased olfactory neuron population in nasal mucosa. Early corticosteroid treatment improved recovery of olfactory abilities in animals.
A University of Otago-led study found that sensory cues alone can drive ageing effects in animals. Researchers tested male mice exposed to female odours and found reduced fertility and increased mortality later in life. The study highlights the importance of sensory perception of mates in influencing life-history trade-offs.
A recent study published in JAMA Network Open found that familiar scents can strengthen memory recall in depressed individuals, potentially aiding recovery. Researchers discovered that odors engage the amygdala, a key component of memory formation, more effectively than words.
A University of Washington team discovered that nitrate radicals in the air degrade scent chemicals released by wildflowers, making them undetectable to nighttime pollinators. The researchers found that pollution likely has worldwide impacts on pollination, with areas including western North America and Europe most affected.
Researchers discovered surprising secrets about how fruit flies adapt their senses to different environments through gene expression patterns. Thousands of genes had undergone significant changes in expression, shaping unique olfactory landscapes of different fly species.
Research found that female silkmoth long sensilla recognize silkworm feces as a deterrent, helping females avoid mulberry trees with high silkworm populations. In contrast, male silkmoths have specialized antennae to detect female sex pheromones, but no clear male counterpart has been identified.
Researchers discover a previously undetected mechanism in mice that explains how each sensory cell in mammalian noses becomes tailored to detect a specific odor chemical. The study reveals the genetic molecule RNA plays a crucial role in this process, with RNA winnowing down receptor genes to a single winner.
Research reveals that fish from the same species can evolve unique sense of smell and display individual foraging 'personalities' to successfully find food. The study highlights the importance of behavioral studies in understanding how sensory systems evolve and resulting fish behavior.
A new study reveals altered gene activity in Alzheimer's patients' olfactory mucosa after SARS-CoV-2 infection, potentially leading to exacerbated COVID-19 outcomes. The research found heightened oxidative stress and altered immune responses in infected cells.
Researchers found that pesticide-adjuvant combinations used in almond orchards can interfere with honey bee communication. The study suggests that these chemicals can alter the antennal responses to brood and alarm pheromones, potentially disrupting colony function.
During pregnancy, distinct pools of stem cells in the adult brain are activated, giving rise to specific types of olfactory bulb neurons that enable mothers to recognize their own pups. These new neurons are temporarily formed and disappear after birth, highlighting the brain's ability to adapt to specific needs.
Researchers used a stellate ganglion block to restore the sense of smell in patients with long-COVID, showing near 100% resolution of phantosmia in some patients. The treatment was effective in improving symptoms for up to 49% of patients at three months.
Researchers discovered a 'neglected' dinosaur, Thescelosaurus neglectus, had exceptional smell and balance abilities. Its brain size was relatively small, but its olfactory bulbs were large, similar to those of living alligators.
The study has shed light on how cats evolved into different species and how genetic changes relate to survival abilities like smell detection. It also revealed that cat genomes tend to have fewer complex genetic variations than other mammal groups, such as primates.
A team of scientists discovered two types of neurons in fruit flies and mice that enable them to identify distinct smells. With experience, these animals can learn to differentiate between very similar odors, a process that could improve machine-learning models and AI systems.
Researchers found that participants chose different grey colours when exposed to various scents, such as coffee and caramel. The study suggests that our sense of smell can influence how we perceive colour, with the presence of certain odours leading to anticipated correspondences in colour perception.
Researchers found that different flours foster distinct bacterial communities, contributing to the variation in sourdough aromas and flavors. The study reveals that bakers can influence the aroma of their sourdough by using different flours.
A study in Frontiers in Psychology found that unconscious 'crossmodal' associations with our sense of smell can distort perception of colors. Participants adjusted sliders to change the color of a square, but their choices were influenced by the odor they smelled, such as perceiving coffee as a reddish-brown color instead of neutral grey.
A cluster of neurons in the fruit fly brain transforms memories about past rewards into actions, guiding the fly's navigation. The UpWiNs also send signals to dopaminergic neurons for higher-order learning, shedding light on parallel neural circuit mechanisms.
Researchers discovered NSMF protein's role in alleviating DNA replication stress by displacing weakly bound RPA proteins and promoting phosphorylation. This mechanism accelerates relief of replication stress, offering a new direction for treating various diseases, including cancer and age-related conditions.
A new artificial olfactory system, integrated on a single chip, detects food spoilage by identifying low levels of hydrogen sulfide and ammonia gases. The system tracks freshness scores in real-time during the spoilage process.
A machine-learning model has achieved human-level proficiency at describing odors, according to a study published in Science. The model matched the prose descriptions of a molecule's odor with its molecular structure, creating a novel data-driven map of human olfaction.
Researchers from the Max Planck Institute have recreated an ancient Egyptian woman's scent used in her mummification, revealing complex ingredients and trade connections. The 'scent of eternity' blend includes beeswax, plant oil, and exotic resins, highlighting sophisticated mummification practices and long-distance trade.
Researchers found that people carrying the APOE e4 gene variant, which increases the risk of Alzheimer's disease, may experience reduced smell detection earlier than those without the gene. The study suggests that testing a person's ability to detect odors could be an early indicator of future memory and thinking problems.
Researchers from SISSA have measured the electrical activity of cells in human olfactory epithelium, revealing a complex communication process between neurons and support cells. The study also explores reactions to various odorant molecules and sets the stage for investigating anomalies related to COVID-19's impact on smell.
Researchers created a detailed analysis of the domestic cat's nasal airway, revealing two distinct regions of air flow during inhalation. The study suggests that the cat nose functions as an efficient dual-purposed gas chromatograph, capable of detecting and separating chemicals quickly and efficiently.
A new computer simulation suggests that domestic cats' noses function similarly to parallel coiled gas chromatographs, enabling efficient odor detection. This finding deepens understanding of how the evolution of convoluted channels enabled mammals' enhanced sense of smell.
Researchers discovered that astrocytes process serotonin to regulate olfactory sensation. The study found that serotonin triggers changes in gene expression patterns, turning astrocytes into hubs of olfactory processing.
Researchers at Leibniz Institute for Food Systems Biology identify two key odorants: sotolon from Maggi seasoning and (2 E ,4 E ,6 Z )-nona-2,4,6-trienal from oatmeal. Maintaining a one-to-one ratio is crucial to reproduce the characteristic walnut aroma.
Researchers developed transgenic ants with fluorescent neurons that flashed green in response to odorants, allowing them to study the ant olfactory system. Contrary to previous findings, they discovered that only a few specific areas of the olfactory system responded to alarm pheromones, suggesting a more localized processing mechanism.
Researchers found that bumblebees use both vision and smell to navigate, with scent marks playing a crucial role in pinpointing the nest entrance in visually ambiguous situations. In experiments, bumblebees overwhelmingly focused on locations suggested by scent marks when visual landmarks were conflicting.
A retrospective analysis of national data found that over 20 million Americans experienced loss of smell or taste after COVID infection, with a large portion never fully recovering these senses. The study estimated that almost 28 million Americans may be left with decreased sense of smell after COVID infection.
The study reveals that spontaneous waves of neurotransmitter glutamate facilitate dendrite pruning, while a unique protection/punishment machinery strengthens certain connections and eliminates others. Proper pruning is critical for neural development, with insufficient or excessive connections linked to neurophysiological disorders.
Researchers at City University of Hong Kong developed a novel, wearable, olfaction feedback system with wireless capabilities for virtual reality. The system releases various odours using miniaturized odour generators and has been tested with an average success rate of 93 percent.
The new design improves detection sensitivity and reduces response time by controlling fluid flow, promoting uniform VOC concentration. The authors plan to further optimize the chamber structure for ultrasensitive volatile sensing.
Mosquitoes use human body odor to find hosts over long distances, with specific airborne components making some people more attractive than others. Researchers found that carboxylic acids and eucalyptol are key contributors to this attraction, with varying levels affecting mosquito choosiness.
A large-scale genomic study of 240 mammal species reveals previously uncharacterized regulatory elements in the human genome, linked to disease risks and distinctive traits. The research provides insights into the evolutionary development of mammalian genomes and their potential applications in medical research.
The new NIH Toolbox V3 iPad App allows doctors to quickly screen patients for cognitive functions such as memory, emotion, and vision. The app covers a wide range of tests spanning four domains, enabling clinicians to assess patients in under 30 minutes.
A new study found that people with long Covid smell loss have reduced brain activity and impaired communication between key smell-processing regions. This suggests a possible link between smell loss and brain changes, which may be reversible through olfactory training.
Researchers at UC San Francisco have created the first molecular-level picture of how an odor molecule activates a human odorant receptor, opening doors to creating novel smells. This achievement paves the way for new insights into biological processes, including fragrances and food science.
Researchers found that symbiotic fungi convert chemical defenses of spruce trees into attractive compounds for bark beetles. The fungi's volatile compounds, particularly oxygenated monoterpenes, serve as chemical signals to keep the symbiosis alive and stimulate tunneling behavior in beetles.