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Smell, olfaction, olfactory

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https://www.readbyqxmd.com/read/28816642/proteomic-analysis-of-the-human-olfactory-bulb
#1
Manjunath Dammalli, Gourav Dey, Anil K Madugundu, Manish Kumar, Benvil Rodrigues, Harsha Gowda, Bychapur Gowrishankar Siddaiah, Anita Mahadevan, Susarla Krishna Shankar, Thottethodi Subrahmanya Keshava Prasad
The importance of olfaction to human health and disease is often underappreciated. Olfactory dysfunction has been reported in association with a host of common complex diseases, including neurological diseases such as Alzheimer's disease and Parkinson's disease. For health, olfaction or the sense of smell is also important for most mammals, for optimal engagement with their environment. Indeed, animals have developed sophisticated olfactory systems to detect and interpret the rich information presented to them to assist in day-to-day activities such as locating food sources, differentiating food from poisons, identifying mates, promoting reproduction, avoiding predators, and averting death...
August 2017: Omics: a Journal of Integrative Biology
https://www.readbyqxmd.com/read/28816480/superior-olfactory-language-and-cognition-in-odor-color-synaesthesia
#2
Laura J Speed, Asifa Majid
Olfaction is often considered a vestigial sense in humans, demoted throughout evolution to make way for the dominant sense of vision. This perspective on olfaction is reflected in how we think and talk about smells in the West, with odor imagery and odor language reported to be difficult. In the present study we demonstrate odor cognition is superior in odor-color synaesthesia, where there are additional sensory connections to odor concepts. Synaesthesia is a neurological phenomenon in which input in 1 modality leads to involuntary perceptual associations...
August 17, 2017: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/28802932/anosmia-and-ageusia-in-parkinson-s-disease
#3
Arjun Tarakad, Joseph Jankovic
Anosmia, the loss of sense of smell, is a common nonmotor feature of Parkinson's disease (PD). Ageusia, the loss of sense of taste, is additionally an underappreciated nonmotor feature of PD. The olfactory tract is involved early in PD as indicated by frequent occurrence of hyposmia or anosmia years or decades before motor symptoms and by autopsy studies showing early synuclein pathology in the olfactory tract and anterior olfactory nucleus even in the early stages of PD. Testing for olfaction consists of evaluation of olfactory thresholds, smell identification and discrimination, and olfactory memory...
2017: International Review of Neurobiology
https://www.readbyqxmd.com/read/28797909/smelling-themselves-dogs-investigate-their-own-odours-longer-when-modified-in-an-olfactory-mirror-test
#4
Alexandra Horowitz
While domestic dogs, Canis familiaris, have been found to be skillful at social cognitive tasks and even some meta-cognitive tasks, they have not passed the test of mirror self-recognition (MSR). Acknowledging the motivational and sensory challenges that might hinder performance, even before the question of self-recognition is broached, this study creates and enacts a novel design extrapolated from the species' natural behaviour. Given dogs' use of olfactory signals in communication, this experiment presents dogs with various canisters for approach and investigation...
August 7, 2017: Behavioural Processes
https://www.readbyqxmd.com/read/28775001/characterization-and-correction-of-olfactory-deficits-in-kidney-disease
#5
Sagar U Nigwekar, Jeremy M Weiser, Sahir Kalim, Dihua Xu, Joshua L Wibecan, Sarah M Dougherty, Laurence Mercier-Lafond, Kristin M Corapi, Nwamaka D Eneanya, Eric H Holbrook, Dennis Brown, Ravi I Thadhani, Teodor G Păunescu
Patients with CKD suffer from food aversion, anorexia, and malnutrition. Although olfaction has a significant role in determining food flavor, our understanding of olfactory impairment and of the olfaction-nutrition axis in patients with kidney disease is limited. We quantified odor identification, odor threshold, and subjective odor perception in a cohort (n=161) comprising 36 participants with CKD, 100 participants with ESRD, and 25 controls. We investigated olfaction-nutrition associations in these participants and examined a novel intervention to improve olfaction in ESRD...
August 3, 2017: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/28770710/olfactory-dysfunction-and-autoimmunity-pathogenesis-and-new-insights
#6
REVIEW
Oded Shamriz, Yehuda Shoenfeld
Olfaction plays an important role in the perception of our environment. Smell impairment is known to be a manifestation of several autoimmune diseases. Similarities between the olfactory and immune systems and previously published human studies and animal models of autoimmune diseases account for the accumulating evidence for this observation. In this review, we will present the current literature concerning olfactory dysfunction in autoimmune diseases, discuss clinical aspects and provide new insights regarding pathogenesis and possible mechanisms...
July 7, 2017: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/28724250/reuse-water-exposure-duration-seasonality-and-treatment-affect-tissue-responses-in-a-model-fish
#7
B J Blunt, A Singh, L Wu, M Gamal El-Din, M Belosevic, K B Tierney
Partially remediated gray (reuse) water will likely find increasing use in a variety of applications owing to the increasing scarcity of freshwater. We aimed to determine if a model fish, the goldfish, could sense reuse water using olfaction (smell), and if 30min or 7d (acute) and 60d (sub-chronic) exposures would affect their olfactory responses to natural odorants. We examined olfaction as previous studies have found that numerous chemicals can impair the olfactory sense, which is critical to carrying out numerous life-sustaining behaviors from feeding to mating...
July 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28653210/lateralized-microstructural-changes-in-early-stage-parkinson-s-disease-in-anterior-olfactory-structures-but-not-in-substantia-nigra
#8
N Joshi, T M Rolheiser, J D Fisk, J R McKelvey, K Schoffer, G Phillips, M Armstrong, M N Khan, R A Leslie, B Rusak, H A Robertson, K P Good
Parkinson's disease (PD) is a progressive neurological disorder characterized by motor symptoms as well as severe deficits in olfactory function and microstructural changes in olfactory brain regions. Because of the evidence of asymmetric neuropathological features in early-stage PD, we examined whether lateralized microstructural changes occur in olfactory brain regions and the substantia nigra in a group of early-stage PD patients. Using diffusion tensor imaging (DTI) and the University of Pennsylvania Smell Identification Test (UPSIT), we assessed 24 early-stage PD patients (Hoehn and Yahr stage 1 or 2) and 26 healthy controls (HC)...
July 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28543731/neuroimaging-biomarkers-and-impaired-olfaction-in-cognitively-normal-individuals
#9
Maria Vassilaki, Teresa J Christianson, Michelle M Mielke, Yonas E Geda, Walter K Kremers, Mary M Machulda, David S Knopman, Ronald C Petersen, Val J Lowe, Clifford R Jack, Rosebud O Roberts
OBJECTIVE: There is a need for inexpensive noninvasive tests to identify older healthy persons at risk for Alzheimer disease (AD) for enrollment in AD prevention trials. Our objective was to examine whether abnormalities in neuroimaging measures of amyloid and neurodegeneration are correlated with odor identification (OI) in the population-based Mayo Clinic Study of Aging. METHODS: Cognitively normal (CN) participants had olfactory function assessed using the Brief Smell Identification Test (B-SIT), underwent magnetic resonance imaging (n = 829) to assess a composite AD signature cortical thickness and hippocampal volume (HVa), and underwent (11) C-Pittsburgh compound B (n = 306) and (18) fluorodeoxyglucose (n = 305) positron emission tomography scanning to assess amyloid accumulation and brain hypometabolism, respectively...
June 2017: Annals of Neurology
https://www.readbyqxmd.com/read/28506924/olfactory-and-gustatory-functions-in-bipolar-disorders-a-systematic-review
#10
REVIEW
Francois Kazour, Sami Richa, Thomas Desmidt, Mathieu Lemaire, Boriana Atanasova, Wissam El Hage
Olfactory and gustatory dysfunctions have been described in different psychiatric disorders. Several studies have found gustatory and olfactory function change in bipolar disorders with various results. The aim of this study is to have a systematic review of studies evaluating gustatory and olfactory function in bipolar disorders. After a systematic search, 15 studies on olfaction and 5 studies on taste were included in this review. The UPSIT (University of Pennsylvania Smell Identification Test) and Sniffin' Sticks were the most widely used tests to evaluate smell...
May 12, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28504111/olfactory-dysfunction-in-neurodegenerative-diseases-is-there-a-common-pathological-substrate
#11
REVIEW
Richard L Doty
In patients with neurodegenerative diseases, there is a spectrum of smell dysfunction ranging from severe loss, as seen in Alzheimer's disease and Parkinson's disease, to relatively little loss, as seen in progressive supranuclear palsy. Given the ubiquitous but varying degrees of olfactory dysfunction among such diseases, it is conceivable that differential disruption of a common primordial neuropathological substrate causes these differences in olfactory function. For example, the amount of damage to forebrain neurotransmitter and neuromodulator circuits, most notably those involving cholinergic transmission, appears to be correlated with quantitative smell test scores across a wide range of neurodegenerative diseases...
June 2017: Lancet Neurology
https://www.readbyqxmd.com/read/28495701/poor-human-olfaction-is-a-19th-century-myth
#12
REVIEW
John P McGann
It is commonly believed that humans have a poor sense of smell compared to other mammalian species. However, this idea derives not from empirical studies of human olfaction but from a famous 19th-century anatomist's hypothesis that the evolution of human free will required a reduction in the proportional size of the brain's olfactory bulb. The human olfactory bulb is actually quite large in absolute terms and contains a similar number of neurons to that of other mammals. Moreover, humans have excellent olfactory abilities...
May 12, 2017: Science
https://www.readbyqxmd.com/read/28471462/the-role-of-metals-in-mammalian-olfaction-of-low-molecular-weight-organosulfur-compounds
#13
REVIEW
Eric Block, Victor S Batista, Hiroaki Matsunami, Hanyi Zhuang, Lucky Ahmed
Covering: up to the end of 2017While suggestions concerning the possible role of metals in olfaction and taste date back 50 years, only recently has it been possible to confirm these proposals with experiments involving individual olfactory receptors (ORs). A detailed discussion of recent experimental results demonstrating the key role of metals in enhancing the response of human and other vertebrate ORs to specific odorants is presented against the backdrop of our knowledge of how the sense of smell functions both at the molecular and whole animal levels...
May 10, 2017: Natural Product Reports
https://www.readbyqxmd.com/read/28469524/olfactory-neuroepithelial-neural-progenitor-cells-from-subjects-with-bipolar-i-disorder
#14
Yonglin Gao, Welby Winstead, Zhenmin Lei, Chengliang Lu, Fred J Roisen, Rif S El-Mallakh
BACKGROUND: Research into the pathophysiology of bipolar disorder (BD) is limited by the inability to examine brain cellular processes in subjects with the illness. METHODS: Endoscopic biopsy was performed in subjects with bipolar I disorder to establish olfactory neural progenitor (ONP) cell lines. Olfactory function was assessed prebiopsy and postbiopsy using the University of Pennsylvania Smell Identification Test (UPSIT). Cells were characterized to determine their lineage...
2017: Journal of Central Nervous System Disease
https://www.readbyqxmd.com/read/28468171/complications-of-nasal-bone-fractures
#15
Kun Hwang, Seung Han Yeom, Suk Hyun Hwang
The aim of this study was to perform a systematic review of the treatment of nasal bone fractures. The search terms ("nasal bone fracture" AND complication) and ("nasal bone fracture" AND [anosmia OR olfaction OR olfactory nerve OR smell]) and (anosmia AND ["nasal preparation" OR "nasal antiseptics"]) were used to search PubMed and SCOPUS. Of the 500 titles, 40 full papers were reviewed. One paper was excluded, and 3 mined papers were added. Ultimately, 12 papers were analyzed. The overall deformity rate was 10...
May 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28447155/fine-tuned-evaluation-of-olfactory-function-in-patients-operated-for-nasal-polyposis
#16
Marie-Hortense Sonnet, Duc Trung Nguyen, Phi-Linh Nguyen-Thi, Fabien Arous, Roger Jankowski, Cécile Rumeau
Given the forced-choice procedure of the identification test, patients with profound anosmia are more likely to have higher identification scores by chance than patients with hyposmia or normosmia. This may be a confusing factor when assessing the sense of smell, which alters the appreciation of real olfaction improvement. The aim of this study was to fine-tune the results of the identification Sniffin' Sticks test before and 6 weeks after surgery using the real identification score. A total of 133 patients underwent the Identification (I) and Threshold (T) tests the day before and 6 weeks after nasalization surgery...
April 26, 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/28410055/olfactory-recognition-based-on-eeg-gamma-band-activity
#17
Onder Aydemir
There are various kinds of brain monitoring techniques, including local field potential, near-infrared spectroscopy, magnetic resonance imaging (MRI), positron emission tomography, functional MRI, electroencephalography (EEG), and magnetoencephalography. Among those techniques, EEG is the most widely used one due to its portability, low setup cost, and noninvasiveness. Apart from other advantages, EEG signals also help to evaluate the ability of the smelling organ. In such studies, EEG signals, which are recorded during smelling, are analyzed to determine the subject lacks any smelling ability or to measure the response of the brain...
April 14, 2017: Neural Computation
https://www.readbyqxmd.com/read/28379355/neuromodulation-in-chemosensory-pathways
#18
Jeremy C McIntyre, Nicolas Thiebaud, John P McGann, Takaki Komiyama, Markus Rothermel
Interactions with the environment depend not only on sensory perception of external stimuli but also on processes of neuromodulation regulated by the internal state of an organism. These processes allow regulation of stimulus detection to match the demands of an organism influenced by its general brain state (satiety, wakefulness/sleep state, attentiveness, arousal, learning etc.). The sense of smell is initiated by sensory neurons located in the nasal cavity that recognize environmental odorants and project axons into the olfactory bulb (OB), where they form synapses with several types of neurons...
June 1, 2017: Chemical Senses
https://www.readbyqxmd.com/read/28349579/periodic-olfactory-assessment-in-patients-undergoing-skull-base-surgery-with-preservation-of-the-olfactory-strip
#19
Smita Upadhyay, Lamia Buohliqah, Ricardo L L Dolci, Bradley A Otto, Daniel M Prevedello, Ricardo L Carrau
OBJECTIVES/HYPOTHESIS: Others have reported olfactory disturbances following endoscopic approaches to the skull base. However, there is a lack of consensus on the extent and duration of dysfunction. This study aimed to compare our results with previously published work and to validate the olfactory strip-sparing approach. STUDY DESIGN: Prospective study to assess olfaction in 50 patients scheduled to undergo resection of skull base tumors via extended endoscopic approaches...
March 27, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28346647/validation-of-olfactory-threshold-testing-methods
#20
Alan Hirsch, Alexander Roussos, Sally Freels
In patients with chemosensory complaints, a head-to-head comparison of unilateral olfaction threshold testing with the Phenyl Ethyl Alcohol Smell Threshold Test (PEA) and the OLFACT-RL Odor Threshold Test (OLFACT-RL) was undertaken. The charts of 23 consecutive patients presenting with chemosensory complaints seen at the Smell and Taste Treatment and Research Foundation were reviewed and information extracted per Institutional Review Board guidelines. All patients had undergone olfactory testing with the PEA test and the OLFACT-RL test in accordance with their published administration manuals...
March 2017: Ear, Nose, & Throat Journal
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