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Parker M, Spennemann DHR, Bond J. Methodologies for smellwalks and scentwalks-a critical review. Chem Senses 2024; 49:bjae005. [PMID: 38349848 PMCID: PMC10878359 DOI: 10.1093/chemse/bjae005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2023] [Indexed: 02/15/2024] Open
Abstract
Olfactory elements of the human environment are essential with respect to culture, society, and heritage, and robust methodological approaches are necessary to identify and describe aspects of this sensory component. To accurately investigate and advance knowledge of olfactory composition of spaces and places, that is, a smellscape-an olfactory contextualized landscape-innovative methodologies such as smellwalks can be employed as part of the research approach. Despite the increasing use of smellwalks, there is no current standard methodology for this investigative method in practice. We identify major themes including variance of group size, participant versus researcher-led walking techniques, reinvention of smellwalking process, and methodological discussion and theory. Limitations and future research potential are suggested, including that of group dynamics, attribute focus, the extension of smellwalk attribute data beyond traditional hedonic attributes, and avenues for development of future processes and protocols for multisensory sensewalks.
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Affiliation(s)
- Murray Parker
- Faculty of Science and Health, Charles Sturt University, PO Box 789, Albury, NSW 2640, Australia
| | - Dirk H R Spennemann
- Gulbali Institute, Charles Sturt University, PO Box 789, Albury, NSW 2640, Australia
| | - Jennifer Bond
- Gulbali Institute of Agriculture, Water & Environment, Charles Sturt University; PO Box 789, Albury, NSW 2640, Australia
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2
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The perception of odor pleasantness is shared across cultures. Curr Biol 2022; 32:2061-2066.e3. [DOI: 10.1016/j.cub.2022.02.062] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 12/16/2021] [Accepted: 02/22/2022] [Indexed: 11/18/2022]
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3
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Chalençon L, Thevenet M, Noury N, Bensafi M, Mandairon N. Identification of new behavioral parameters to assess odorant hedonic value in humans: A naturalistic approach. J Neurosci Methods 2022; 366:109422. [PMID: 34826503 DOI: 10.1016/j.jneumeth.2021.109422] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 11/04/2021] [Accepted: 11/18/2021] [Indexed: 11/16/2022]
Abstract
BACKGROUND When you smell an odorant, your first reaction will certainly be either I like it or I dislike it. This primary reaction is a reflection of what is called the "hedonic value" of the odor. Very often, this hedonic value dominates the olfactory percept, more than olfactory identification or intensity. This component of olfactory perception is of primary importance for guiding behavior: avoiding danger (the smell of smoke, gas, etc.), consuming food, or seduction. Olfactory hedonics can be assessed using a large number of methods in humans, including psychophysical measures, autonomic responses, measurement of facial expressions or peripheral nervous activity. All of these techniques have their limitations: subjectivity, invasiveness, need for expertise, etc. A NEW METHOD: The olfactory system is closely linked to the reward system, the role of which is to mediate motivated behavior. In this context, we propose that the capacity odorants have of recruiting the reward system and thus inducing motivated behavior can be used to identify new behavioral parameters to assess odor hedonic value in humans. RESULTS We recorded freely moving human participants exploring odors emanating from flasks, and showed that five parameters linked to motivated behavior were closely linked to odor hedonics: speed of approach to the nose and withdrawal of the flask containing the odorant, distance between flask and nose, number of samplings, and withdrawal distance (maximal distance between nose and flask after odor sampling). CONCLUSIONS We highlighted new non-verbal and non-invasive parameters to evaluate olfactory hedonics in humans based on the assessment of odor-motivated behavior.
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Affiliation(s)
- Laura Chalençon
- Lyon Neuroscience Research Center, Neurobiology and Plasticity of Olfactory Perception Team, University Lyon1, Inserm U1028 - CNRS UMR5292, F-69000, France; INSERM, U1028 CNRS UMR5292, F-69000, France; Neurobiology and Plasticity of Olfactory Perception Team, University Lyon1, Inserm U1028 - CNRS UMR5292, F-69000, France
| | - Marc Thevenet
- Lyon Neuroscience Research Center, Neurobiology and Plasticity of Olfactory Perception Team, University Lyon1, Inserm U1028 - CNRS UMR5292, F-69000, France; INSERM, U1028 CNRS UMR5292, F-69000, France; Neurobiology and Plasticity of Olfactory Perception Team, University Lyon1, Inserm U1028 - CNRS UMR5292, F-69000, France
| | - Norbert Noury
- Institute Nanotechnology Lyon, Biomedical Sensors Group, University of Lyon 1, CNRS, UMR5270, Villeurbanne F-69621, France
| | - Moustafa Bensafi
- Lyon Neuroscience Research Center, Neurobiology and Plasticity of Olfactory Perception Team, University Lyon1, Inserm U1028 - CNRS UMR5292, F-69000, France; INSERM, U1028 CNRS UMR5292, F-69000, France; Neurobiology and Plasticity of Olfactory Perception Team, University Lyon1, Inserm U1028 - CNRS UMR5292, F-69000, France
| | - Nathalie Mandairon
- Lyon Neuroscience Research Center, Neurobiology and Plasticity of Olfactory Perception Team, University Lyon1, Inserm U1028 - CNRS UMR5292, F-69000, France; INSERM, U1028 CNRS UMR5292, F-69000, France; Neurobiology and Plasticity of Olfactory Perception Team, University Lyon1, Inserm U1028 - CNRS UMR5292, F-69000, France.
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4
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Manesse C, Ferdenzi C, Mantel M, Sabri M, Bessy M, Fournel A, Faure F, Bellil D, Landis B, Hugentobler M, Giboreau A, Rouby C, Bensafi M. The prevalence of olfactory deficits and their effects on eating behavior from childhood to old age: A large-scale study in the French population. Food Qual Prefer 2021. [DOI: 10.1016/j.foodqual.2021.104273] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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5
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Olfactory Perception in Relation to the Physicochemical Odor Space. Brain Sci 2021; 11:brainsci11050563. [PMID: 33925220 PMCID: PMC8146962 DOI: 10.3390/brainsci11050563] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 04/23/2021] [Accepted: 04/26/2021] [Indexed: 11/29/2022] Open
Abstract
A growing body of research aims at solving what is often referred to as the stimulus-percept problem in olfactory perception. Although computational efforts have made it possible to predict perceptual impressions from the physicochemical space of odors, studies with large psychophysical datasets from non-experts remain scarce. Following previous approaches, we developed a physicochemical odor space using 4094 molecular descriptors of 1389 odor molecules. For 20 of these odors, we examined associations with perceived pleasantness, intensity, odor quality and detection threshold, obtained from a dataset of 2000 naïve participants. Our results show significant differences in perceptual ratings, and we were able to replicate previous findings on the association between perceptual ratings and the first dimensions of the physicochemical odor space. However, the present analyses also revealed striking interindividual variations in perceived pleasantness and intensity. Additionally, interactions between pleasantness, intensity, and olfactory and trigeminal qualitative dimensions were found. To conclude, our results support previous findings on the relation between structure and perception on the group level in our sample of non-expert raters. In the challenging task to relate olfactory stimulus and percept, the physicochemical odor space can serve as a reliable and helpful tool to structure the high-dimensional space of olfactory stimuli. Nevertheless, human olfactory perception in the individual is not an analytic process of molecule detection alone, but is part of a holistic integration of multisensory inputs, context and experience.
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6
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Abstract
Approximately 5% of the general population is affected by functional anosmia with approximately additional 15% exhibiting decreased olfactory function. Many of these individuals ask for help. Because the subjective rating of olfactory function is biased, assessment of olfactory function is important. Olfactory measurements are needed for patient counseling and the tracking of changes in the sense of smell over time. The present review provides an overview of frequently used psychophysical tests for olfactory function, discusses differences between threshold and suprathreshold aspects of olfactory function, and gives examples on how to apply psychophysical tests.
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Affiliation(s)
- Thomas Hummel
- Department of Otorhinolaryngology, Smell & Taste Clinic, "Technische Universität Dresden", Dresden, Germany
| | - Dino Podlesek
- Department of Neurosurgery, "Technische Universität Dresden", Dresden, Germany
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7
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Schaal B, Saxton TK, Loos H, Soussignan R, Durand K. Olfaction scaffolds the developing human from neonate to adolescent and beyond. Philos Trans R Soc Lond B Biol Sci 2020; 375:20190261. [PMID: 32306879 PMCID: PMC7209940 DOI: 10.1098/rstb.2019.0261] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/16/2020] [Indexed: 12/24/2022] Open
Abstract
The impact of the olfactory sense is regularly apparent across development. The fetus is bathed in amniotic fluid (AF) that conveys the mother's chemical ecology. Transnatal olfactory continuity between the odours of AF and milk assists in the transition to nursing. At the same time, odours emanating from the mammary areas provoke appetitive responses in newborns. Odours experienced from the mother's diet during breastfeeding, and from practices such as pre-mastication, may assist in the dietary transition at weaning. In parallel, infants are attracted to and recognize their mother's odours; later, children are able to recognize other kin and peers based on their odours. Familiar odours, such as those of the mother, regulate the child's emotions, and scaffold perception and learning through non-olfactory senses. During juvenility and adolescence, individuals become more sensitive to some bodily odours, while the timing of adolescence itself has been speculated to draw from the chemical ecology of the family unit. Odours learnt early in life and within the family niche continue to influence preferences as mate choice becomes relevant. Olfaction thus appears significant in turning on, sustaining and, in cases when mother odour is altered, disturbing adaptive reciprocity between offspring and carer during the multiple transitions of development between birth and adolescence. This article is part of the Theo Murphy meeting issue 'Olfactory communication in humans'.
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Affiliation(s)
- Benoist Schaal
- Developmental Ethology and Cognitive Psychology Laboratory, Centre des Sciences du Goût, UMR 6265 CNRS-Université de Bourgogne Franche-Comté, Inra-AgroSup, Dijon, France
| | - Tamsin K. Saxton
- Department of Psychology, Northumbria University, Newcastle upon Tyne, UK
| | - Hélène Loos
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Department of Sensory Analytics, Fraunhofer Institute for Process Engineering and Packaging IVV, Freising, Germany
| | - Robert Soussignan
- Developmental Ethology and Cognitive Psychology Laboratory, Centre des Sciences du Goût, UMR 6265 CNRS-Université de Bourgogne Franche-Comté, Inra-AgroSup, Dijon, France
| | - Karine Durand
- Developmental Ethology and Cognitive Psychology Laboratory, Centre des Sciences du Goût, UMR 6265 CNRS-Université de Bourgogne Franche-Comté, Inra-AgroSup, Dijon, France
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8
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Becker S, Bräscher AK, Bannister S, Bensafi M, Calma-Birling D, Chan RCK, Eerola T, Ellingsen DM, Ferdenzi C, Hanson JL, Joffily M, Lidhar NK, Lowe LJ, Martin LJ, Musser ED, Noll-Hussong M, Olino TM, Pintos Lobo R, Wang Y. The role of hedonics in the Human Affectome. Neurosci Biobehav Rev 2019; 102:221-241. [PMID: 31071361 PMCID: PMC6931259 DOI: 10.1016/j.neubiorev.2019.05.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 03/25/2019] [Accepted: 05/03/2019] [Indexed: 01/06/2023]
Abstract
Experiencing pleasure and displeasure is a fundamental part of life. Hedonics guide behavior, affect decision-making, induce learning, and much more. As the positive and negative valence of feelings, hedonics are core processes that accompany emotion, motivation, and bodily states. Here, the affective neuroscience of pleasure and displeasure that has largely focused on the investigation of reward and pain processing, is reviewed. We describe the neurobiological systems of hedonics and factors that modulate hedonic experiences (e.g., cognition, learning, sensory input). Further, we review maladaptive and adaptive pleasure and displeasure functions in mental disorders and well-being, as well as the experience of aesthetics. As a centerpiece of the Human Affectome Project, language used to express pleasure and displeasure was also analyzed, and showed that most of these analyzed words overlap with expressions of emotions, actions, and bodily states. Our review shows that hedonics are typically investigated as processes that accompany other functions, but the mechanisms of hedonics (as core processes) have not been fully elucidated.
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Affiliation(s)
- Susanne Becker
- Department of Cognitive and Clinical Neuroscience, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, J5, 68159 Mannheim, Germany.
| | - Anne-Kathrin Bräscher
- Department of Clinical Psychology, Psychotherapy and Experimental Psychopathology, University of Mainz, Wallstr. 3, 55122 Mainz, Germany.
| | | | - Moustafa Bensafi
- Research Center in Neurosciences of Lyon, CNRS UMR5292, INSERM U1028, Claude Bernard University Lyon 1, Lyon, Centre Hospitalier Le Vinatier, 95 bd Pinel, 69675 Bron Cedex, France.
| | - Destany Calma-Birling
- Department of Psychology, University of Wisconsin-Oshkosh, 800 Algoma, Blvd., Clow F011, Oshkosh, WI 54901, USA.
| | - Raymond C K Chan
- Neuropsychology and Applied Cognitive Neuroscience Laboratory, CAS Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing 100101, China.
| | - Tuomas Eerola
- Durham University, Palace Green, DH1 RL3, Durham, UK.
| | - Dan-Mikael Ellingsen
- Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, CNY149-2301, 13th St, Charlestown, MA 02129, USA.
| | - Camille Ferdenzi
- Research Center in Neurosciences of Lyon, CNRS UMR5292, INSERM U1028, Claude Bernard University Lyon 1, Lyon, Centre Hospitalier Le Vinatier, 95 bd Pinel, 69675 Bron Cedex, France.
| | - Jamie L Hanson
- University of Pittsburgh, Department of Psychology, 3939 O'Hara Street, Rm. 715, Pittsburgh, PA 15206, USA.
| | - Mateus Joffily
- Groupe d'Analyse et de Théorie Economique (GATE), 93 Chemin des Mouilles, 69130, Écully, France.
| | - Navdeep K Lidhar
- Department of Psychology, University of Toronto Mississauga, Mississauga, ON L5L 1C6, Canada.
| | - Leroy J Lowe
- Neuroqualia (NGO), 36 Arthur Street, Truro, NS, B2N 1X5, Canada.
| | - Loren J Martin
- Department of Psychology, University of Toronto Mississauga, Mississauga, ON L5L 1C6, Canada.
| | - Erica D Musser
- Department of Psychology, Center for Childen and Families, Florida International University, 11200 SW 8th St., Miami, FL 33199, USA.
| | - Michael Noll-Hussong
- Clinic for Psychiatry and Psychotherapy, Division of Psychosomatic Medicine and Psychotherapy, Saarland University Medical Centre, Kirrberger Strasse 100, D-66421 Homburg, Germany.
| | - Thomas M Olino
- Temple University, Department of Psychology, 1701N. 13th St, Philadelphia, PA 19010, USA.
| | - Rosario Pintos Lobo
- Department of Psychology, Center for Childen and Families, Florida International University, 11200 SW 8th St., Miami, FL 33199, USA.
| | - Yi Wang
- Neuropsychology and Applied Cognitive Neuroscience Laboratory, CAS Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing 100101, China.
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9
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Tamura K, Hamakawa M, Okamoto T. Olfactory modulation of colour working memory: How does citrus-like smell influence the memory of orange colour? PLoS One 2018; 13:e0203876. [PMID: 30212534 PMCID: PMC6136778 DOI: 10.1371/journal.pone.0203876] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Accepted: 08/29/2018] [Indexed: 11/29/2022] Open
Abstract
Olfactory modulation of vision is not well understood whereas visual modulation of olfaction has been more fully investigated. This study aimed to reveal in a simple manner whether there is olfactory modulation of colour working memory using an odour that induces a citrus-like smell and is associated with orange colours. We assumed that the odour would have modulatory effects on the colour information stored in working memory. To clarify whether these effects are supportive or disruptive, during the colour working memory task we measured an event-related potential component, P3, which is involved in attentional processes of working memory. The results indicated that odour presentation mediated a decline in the rate of correct guesses for orange colours. Furthermore, the odour suppressed P3 during reddish-colour retrieval, including orange. These results suggest that colour working memory in orange can be disrupted via olfactory modulation with citrus-like odours.
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Affiliation(s)
- Kaori Tamura
- Faculty of Arts and Science, Kyushu University, Nishi-ku, Fukuoka, Japan
| | - Masayuki Hamakawa
- Graduate School of Systems Life Sciences, Kyushu University, Nishi-ku, Fukuoka, Japan
| | - Tsuyoshi Okamoto
- Faculty of Arts and Science, Kyushu University, Nishi-ku, Fukuoka, Japan
- Graduate School of Systems Life Sciences, Kyushu University, Nishi-ku, Fukuoka, Japan
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10
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Hamakawa M, Okamoto T. The effect of different emotional states on olfactory perception: A preliminary study. FLAVOUR FRAG J 2018. [DOI: 10.1002/ffj.3469] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Masayuki Hamakawa
- Graduate School of Systems Life Sciences; Kyushu University; Fukuoka Japan
- Research Fellow of Japan Society for the Promotion of Science; Tokyo Japan
| | - Tsuyoshi Okamoto
- Graduate School of Systems Life Sciences; Kyushu University; Fukuoka Japan
- Faculty of Arts and Science; Kyushu University; Fukuoka Japan
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11
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Ferdenzi C, Rouby C, Bensafi M. The Social Nose: Importance of Olfactory Perception in Group Dynamics and Relationships. PSYCHOLOGICAL INQUIRY 2016. [DOI: 10.1080/1047840x.2016.1215207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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12
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Stevenson RJ, Boakes RA, Oaten MJ, Yeomans MR, Mahmut M, Francis HM. Chemosensory Abilities in Consumers of a Western-Style Diet. Chem Senses 2016; 41:505-13. [DOI: 10.1093/chemse/bjw053] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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13
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Affiliation(s)
- Anne Tromelin
- CNRS; UMR6265 Centre des Sciences du Goût et de l'Alimentation; F-21000 Dijon France
- INRA; UMR1324 Centre des Sciences du Goût et de l'Alimentation; F-21000 Dijon France
- Université de Bourgogne; UMR Centre des Sciences du Goût et de l'Alimentation; F-21000 Dijon France
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14
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Kastner AK, Flohr ELR, Pauli P, Wieser MJ. A Scent of Anxiety: Olfactory Context Conditioning and its Influence on Social Cues. Chem Senses 2015; 41:143-53. [DOI: 10.1093/chemse/bjv067] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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15
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Joussain P, Chakirian A, Kermen F, Rouby C, Bensafi M. Physicochemical influence on odor hedonics. Commun Integr Biol 2014. [DOI: 10.4161/cib.15811] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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16
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Joussain P, Rouby C, Bensafi M. A pleasant familiar odor influences perceived stress and peripheral nervous system activity during normal aging. Front Psychol 2014; 5:113. [PMID: 24596564 PMCID: PMC3925886 DOI: 10.3389/fpsyg.2014.00113] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Accepted: 01/27/2014] [Indexed: 11/13/2022] Open
Abstract
Effects of smells on stress have been demonstrated in animals and humans, suggesting that inhaling certain odorants may counteract the negative effects of stress. Because stress plays a key role in cerebral aging, the present study set out to examine whether positive odor effects on perceived stress can be achieved in elderly individuals. To this end, two groups of aged individuals (n = 36 women, aged from 55 to 65 years), were tested. The first group was exposed for 5 days to a pleasant and, by end of exposure, familiar odor (“exposure odor”), whereas the other was exposed to a non-scented control stimulus. Stress and mood states were assessed before and after the 5-day odor exposure period. Psychophysiological markers were also assessed at the end of exposure, in response to the “exposure odor” and to a “new odor.” Results revealed that stress on this second exposure was decreased and zygomatic electromyogram activity was increased specifically in the group previously exposed to the odor (p < 0.05). Taken as a whole, these findings offer a new look at the relationship between perceived stress, olfaction and normal aging, opening up new research perspectives on the effect of olfaction on quality of life and well-being in aged individuals.
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Affiliation(s)
- Pauline Joussain
- Lyon Neuroscience Research Center, CNRS UMR5292, INSERM U1028, University of Lyon Lyon, France
| | - Catherine Rouby
- Lyon Neuroscience Research Center, CNRS UMR5292, INSERM U1028, University of Lyon Lyon, France
| | - Moustafa Bensafi
- Lyon Neuroscience Research Center, CNRS UMR5292, INSERM U1028, University of Lyon Lyon, France
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17
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Bensafi M, Iannilli E, Schriever VA, Poncelet J, Seo HS, Gerber J, Rouby C, Hummel T. Cross-modal integration of emotions in the chemical senses. Front Hum Neurosci 2013; 7:883. [PMID: 24391573 PMCID: PMC3868915 DOI: 10.3389/fnhum.2013.00883] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Accepted: 12/04/2013] [Indexed: 12/05/2022] Open
Abstract
Although the brain structures involved in integrating odorant and trigeminal stimuli are well-documented, there is still a need to clarify (1) how emotional response is represented in the human brain during cross-modal interaction between odors and trigeminal stimuli, and (2) whether the degree of congruency between the two types of stimuli influences these emotional responses and their neural processing. These questions were explored combining psychophysics, event-related potentials (ERP) and fMRI in the same group of 17 subjects under a “congruent condition” (intranasal carbon dioxide mixed with the smell of orange, a combination found in soda drinks, for example), and an “incongruent condition” (intranasal carbon dioxide mixed with the smell of rose, a combination not encountered in everyday life). Responses to the 3 constituent stimuli (carbon dioxide, orange, and rose) were also measured. Hedonic and intensity ratings were collected for all stimulations. The congruent bimodal stimulus was rated as more pleasant than the incongruent. This behavioral effect was associated with enhanced neural activity in the hippocampus and anterior cingulate gyrus, indicating that these brain areas mediate reactivation of pleasant and congruent olfactory-trigeminal associations.
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Affiliation(s)
- Moustafa Bensafi
- CNRS UMR5292, INSERM U1028, Lyon Neuroscience Research Center, University Lyon Lyon, France
| | - Emilia Iannilli
- Smell and Taste Clinic, Department of Otorhinolaryngology, University of Dresden Medical School Dresden, Germany
| | - Valentin A Schriever
- Smell and Taste Clinic, Department of Otorhinolaryngology, University of Dresden Medical School Dresden, Germany
| | - Johan Poncelet
- CNRS UMR5292, INSERM U1028, Lyon Neuroscience Research Center, University Lyon Lyon, France
| | - Han-Seok Seo
- Department of Food Science, University of Arkansas Fayetteville, AR, USA
| | - Johannes Gerber
- Department of Neuroradiology, University of Dresden Medical School Dresden, Germany
| | - Catherine Rouby
- CNRS UMR5292, INSERM U1028, Lyon Neuroscience Research Center, University Lyon Lyon, France
| | - Thomas Hummel
- Smell and Taste Clinic, Department of Otorhinolaryngology, University of Dresden Medical School Dresden, Germany
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18
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Harker M, Carvell AM, Marti VPJ, Riazanskaia S, Kelso H, Taylor D, Grimshaw S, Arnold DS, Zillmer R, Shaw J, Kirk JM, Alcasid ZM, Gonzales-Tanon S, Chan GP, Rosing EAE, Smith AM. Functional characterisation of a SNP in the ABCC11 allele - effects on axillary skin metabolism, odour generation and associated behaviours. J Dermatol Sci 2013; 73:23-30. [PMID: 24076068 DOI: 10.1016/j.jdermsci.2013.08.016] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2013] [Revised: 08/01/2013] [Accepted: 08/30/2013] [Indexed: 11/19/2022]
Abstract
BACKGROUND A single nucleotide polymorphism (SNP), 538G→A, leading to a G180R substitution in the ABCC11 gene results in reduced concentrations of apocrine derived axillary odour precursors. OBJECTIVE Determine the axillary odour levels in the SNP ABCC11 genotype variants and to investigate if other parameters associated with odour production are affected. METHODS Axillary odour was assessed by subjective quantification and gas chromatography headspace analysis. Metabolite profiles, microbiome diversity and personal hygiene habits were also assessed. RESULTS Axillary odour in the A/A homozygotes was significantly lower compared to the G/A and G/G genotypes. However, the perception-based measures still detected appreciable levels of axillary odour in the A/A subjects. Metabolomic analysis highlighted significant differences in axillary skin metabolites between A/A subjects compared to those carrying the G allele. These differences resulted in A/A subjects lacking specific volatile odourants in the axillary headspace, but all genotypes produced odoriferous short chain fatty acids. Microbiomic analysis revealed differences in the relative abundance of key bacterial genera associated with odour generation between the different genotypes. Deodorant usage indicated a high level of self awareness of axillary odour levels with A/A individuals less likely to adopt personal hygiene habits designed to eradicate/mask its presence. CONCLUSIONS The SNP in the ABCC11 gene results in lower levels of axillary odour in the A/A homozygotes compared to those carrying the G allele, but A/A subjects still produce noticeable amounts of axillary odour. Differences in axillary skin metabolites, bacterial genera and personal hygiene behaviours also appear to be influenced by this SNP.
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Affiliation(s)
- Mark Harker
- Unilever Research & Development, Quarry Road East, Port Sunlight, United Kingdom.
| | - Ann-Marie Carvell
- Unilever Research & Development, Quarry Road East, Port Sunlight, United Kingdom
| | - Vernon P J Marti
- Unilever Research & Development, Quarry Road East, Port Sunlight, United Kingdom
| | - Svetlana Riazanskaia
- Unilever Research & Development, Quarry Road East, Port Sunlight, United Kingdom
| | - Hailey Kelso
- Unilever Research & Development, Quarry Road East, Port Sunlight, United Kingdom
| | - David Taylor
- Unilever Research & Development, Quarry Road East, Port Sunlight, United Kingdom
| | - Sally Grimshaw
- Unilever Research & Development, Quarry Road East, Port Sunlight, United Kingdom
| | - David S Arnold
- Unilever Research & Development, Quarry Road East, Port Sunlight, United Kingdom
| | - Ruediger Zillmer
- Unilever Research & Development, Quarry Road East, Port Sunlight, United Kingdom
| | - Jane Shaw
- Unilever Research & Development, Quarry Road East, Port Sunlight, United Kingdom
| | - Jayne M Kirk
- Waters Corporation, MS Technologies Centre, Manchester, United Kingdom
| | - Zee M Alcasid
- Unilever Philippines Inc., 1351 United Nations Avenue, Paco, 1007 Manila, Philippines
| | - Sheila Gonzales-Tanon
- Unilever Philippines Inc., 1351 United Nations Avenue, Paco, 1007 Manila, Philippines
| | - Gertrude P Chan
- Clinical Trial Management & Testing Associates, Inc., Unit 1207, 2301 Civic Place, Civic Drive, Filinvest Corporate City, Alabang, Muntinlupa City, Philippines
| | - Egge A E Rosing
- Unilever Research Laboratory, Oliver van Noortlaan 120, 3133 AT Vlaardingen, The Netherlands
| | - Adrian M Smith
- Unilever Discover, Colworth Science Park, Sharnbrook, United Kingdom
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19
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Demattè ML, Endrizzi I, Biasioli F, Corollaro ML, Pojer N, Zampini M, Aprea E, Gasperi F. Food neophobia and its relation with olfactory ability in common odour identification. Appetite 2013; 68:112-7. [DOI: 10.1016/j.appet.2013.04.021] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2012] [Revised: 04/18/2013] [Accepted: 04/22/2013] [Indexed: 10/26/2022]
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20
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A portable experimental apparatus for human olfactory fMRI experiments. J Neurosci Methods 2013; 218:29-38. [DOI: 10.1016/j.jneumeth.2013.04.021] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Revised: 04/23/2013] [Accepted: 04/24/2013] [Indexed: 11/18/2022]
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21
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Joussain P, Thevenet M, Rouby C, Bensafi M. Effect of aging on hedonic appreciation of pleasant and unpleasant odors. PLoS One 2013; 8:e61376. [PMID: 23637821 PMCID: PMC3634785 DOI: 10.1371/journal.pone.0061376] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Accepted: 03/08/2013] [Indexed: 11/18/2022] Open
Abstract
Does hedonic appreciation evolve differently for pleasant odors and unpleasant odors during normal aging? To answer this question we combined psychophysics and electro-encephalographic recordings in young and old adults. A first study showed that pleasant odorants (but not unpleasant ones) were rated as less pleasant by old adults. A second study validated this decrease in hedonic appreciation for agreeable odors and further showed that smelling these odorants decreased beta event-related synchronization in aged participants. In conclusion, the study offers new insights into the evolution of odor hedonic perception during normal aging, highlighting for the first time a change in processing pleasant odors.
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Affiliation(s)
- Pauline Joussain
- CNRS UMR5292, INSERM U1028, Lyon Neuroscience Research Center, University Lyon, Lyon, France.
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22
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Greenberg MI, Curtis JA, Vearrier D. The perception of odor is not a surrogate marker for chemical exposure: a review of factors influencing human odor perception. Clin Toxicol (Phila) 2013; 51:70-6. [PMID: 23387344 DOI: 10.3109/15563650.2013.767908] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
CONTEXT Clinical toxicologists perform risk assessments and clinical evaluations for patients with potential exposure to airborne toxicants in which the patient's self-reported perception of odor may be the only indicator that an exposure may have taken place. OBJECTIVE To review the factors that may affect the human ability to perceive chemical odors and relate those odors to specific chemical exposures. METHODS The medical literature, from 1950 through 2012, was searched using the OVID database and the PUBMED database. The searches returned 238 articles, of which 113 involved human studies and were published in the English language. Of these 113 articles, 40 articles discussed odor issues and thus were chosen as specifically relevant to the topic. Bibliographies of all articles were also searched for other relevant references and this found six additional articles, making a total of 46. FACTORS THAT MAY AFFECT OLFACTION AND THE ABILITY TO PERCEIVE ODOR: Genetic/population: Ethnic background is associated with widely differing odor detection abilities and thresholds. A significant genetic influence for the ability to smell and perceive odor has been reported. Gender: Women are superior to men in their ability to identify odors. Age. Increasing age is correlated with higher odor detection thresholds. Medical conditions: A variety of medical conditions have been associated with deficits in olfaction, including diseases of the nose and sinuses, multiple sclerosis, and schizophrenia. Alcoholism and smoking: Abuse of alcohol results in impaired olfactory sense, and smoking tobacco products alters odor detection threshold in a dose-related manner. Occupational and environmental factors: Repeated inhalation of any chemical results in olfactory fatigue over relatively short time frames that leads to a decreased ability to accurately detect and identify an odor. Recent exposure to relatively high concentrations of a chemical has been shown to affect sensitivity to that particular odorant, altering subsequent detection thresholds by up to three orders of magnitude. Applicability of proposed odor thresholds: Humans are only able to identify three to four components of complex olfactory mixtures and the odorants present in the mixture affect which individual components are detected. Odorants present in suprathreshold concentrations in a mixture may effectively mask the presence of odorants present in perithreshold concentrations. Self-rating of olfactory function may not correlate with actual olfactory ability. It is even more difficult to accurately determine intensity of an odor in a quantifiable way. For example, under conditions of constant stimulation with hydrogen sulfide, perceptual intensity was reported to decrease exponentially with time of stimulation. Concomitant visual stimulation also affects odor intensity. Some chemicals, such as hydrogen sulfide, may induce reactions in humans related solely to their odor, even when they are present in concentrations substantially lower than those levels usually associated with the development of adverse clinical effects. There is a wealth of literature suggesting that the intensity of perceived odor, the degree of irritation, and the reported health effects of exposure to an odorant chemical are affected by psychological state and bias. Multiple theories have been proposed to explain the cognitive basis for perceived illness in association with the perception of odor. The concept of odor has been reported to be intrinsically and cognitively associated with illness rather than with health. Assigning negative bias to an odor prior to an exposure results in the reporting of significantly more health-related symptoms following exposure. This suggests that those symptoms are not mediated by the odor directly, but rather by an individual's cognitive associations between odor and health. CONCLUSIONS Attempts to verify exposure intensity based on the report of a perceived odor is unreliable and has no useful application in legitimate exposure assessment paradigms. Detection of an odor does not imply a medically significant exposure to a toxicant and, due to subject bias and the difficulty of detecting individual odorants in mixtures, may not constitute an exposure to the purported substance.
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Affiliation(s)
- Michael I Greenberg
- Division of Medical Toxicology, Department of Emergency Medicine, Drexel University College of Medicine, Philadelphia, PA, USA.
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23
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Bensafi M, Croy I, Phillips N, Rouby C, Sezille C, Gerber J, Small DM, Hummel T. The effect of verbal context on olfactory neural responses. Hum Brain Mapp 2012; 35:810-8. [PMID: 23225581 DOI: 10.1002/hbm.22215] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2012] [Revised: 09/14/2012] [Accepted: 10/02/2012] [Indexed: 11/07/2022] Open
Abstract
Odor names refer usually to "source" object categories. For example, the smell of rose is often described with its source category (flower). However, linguistic studies suggest that odors can also be named with labels referring to categories of "practices". This is the case when rose odor is described with a verbal label referring to its use in fragrance practices ("body lotion," cosmetic for example). It remains unknown whether naming an odor by its practice category influences olfactory neural responses differently than that observed when named with its source category. The aim of this study was to investigate this question. To this end, functional MRI was used in a within-subjects design comparing brain responses to four different odors (peach, chocolate, linden blossom, and rose) under two conditions whereby smells were described either (1) with their source category label (food and flower) or (2) with a practice category label (body lotion). Both types of labels induced activations in secondary olfactory areas (orbitofrontal cortex), whereas only the source label condition induced activation in the cingulate cortex and the insula. In summary, our findings offer a new look at olfactory perception by indicating differential brain responses depending on whether odors are named according to their source or practice category.
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Affiliation(s)
- Moustafa Bensafi
- CNRS, UMR5292, Lyon Neuroscience Research Center, University Lyon, F-69000, France
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24
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Kermen F, Chakirian A, Sezille C, Joussain P, Le Goff G, Ziessel A, Chastrette M, Mandairon N, Didier A, Rouby C, Bensafi M. Molecular complexity determines the number of olfactory notes and the pleasantness of smells. Sci Rep 2011; 1:206. [PMID: 22355721 PMCID: PMC3244502 DOI: 10.1038/srep00206] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2011] [Accepted: 12/05/2011] [Indexed: 11/09/2022] Open
Abstract
One major unresolved problem in olfaction research is to relate the percept to the molecular structure of stimuli. The present study examined this issue and showed for the first time a quantitative structure-odor relationship in which the more structurally complex a monomolecular odorant, the more numerous the olfactory notes it evokes. Low-complexity odorants were also rated as more aversive, reflecting the fact that low molecular complexity may serve as a warning cue for the olfactory system. Taken together, these findings suggest that molecular complexity provides a framework to explain the subjective experience of smells.
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Affiliation(s)
- F Kermen
- INSERM, U1028, CNRS, UMR5292, Lyon Neuroscience Research Center, Neuroplasticity and Neuropathology of Olfactory Perception Team, Lyon, F-69000, France; University of Lyon, F-69000, France
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25
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The lyon clinical olfactory test: validation and measurement of hyposmia and anosmia in healthy and diseased populations. Int J Otolaryngol 2011; 2011:203805. [PMID: 22046188 PMCID: PMC3199207 DOI: 10.1155/2011/203805] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2011] [Revised: 08/07/2011] [Accepted: 08/18/2011] [Indexed: 11/25/2022] Open
Abstract
The LCOT is a self-administered test designed to assess olfactory deficits. Altogether, 525 subjects contributed to the validation. Elderly participants were well represented in this sample. In a validation study (study 1), 407 healthy and 17 anosmic volunteers between 15 and 91 years of age underwent threshold, supraliminal detection, and identification testing. Cutoff values for normosmia and hyposmia were calculated and applied in a second study in a group of patients with smell complaints and in a group of Alzheimer patients with age-matched controls. Incidence of smell deficit was estimated at 5.6% in the healthy population of study 1, and at 16% in the elderly control group of study 2. Assessment of the ability of each subtest to discriminate between groups showed that LCOT is relevant to differentiating between perception and identification deficits and between Alzheimer's and hyposmic patients.
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26
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Joussain P, Chakirian A, Kermen F, Rouby C, Bensafi M. Physicochemical influence on odor hedonics: Where does it occur first? Commun Integr Biol 2011; 4:563-5. [PMID: 22046463 DOI: 10.4161/cib.4.5.15811] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2011] [Accepted: 04/11/2011] [Indexed: 11/19/2022] Open
Abstract
We recently reported data showing that, while human olfactory pleasantness is modulated by semantic knowledge of smells, the physicochemical aspects of odorant molecules are prominent determinants of odor hedonic valence, especially in children and seniors, two age groups characterized by either low level of (children) or weak access to (seniors) odor semantic knowledge.1 Here, we present additional data from a human and an animal study, confirming that odorant structure predicts odor pleasantness and suggesting that this influence may be already engraved at receptor level.
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Affiliation(s)
- Pauline Joussain
- Centre de Recherche en Neurosciences de Lyon; Université de Lyon; Lyon, France
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27
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Domínguez PR. The study of postnatal and later development of the taste and olfactory systems using the human brain mapping approach: An update. Brain Res Bull 2011; 84:118-24. [DOI: 10.1016/j.brainresbull.2010.12.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2010] [Revised: 12/12/2010] [Accepted: 12/14/2010] [Indexed: 11/30/2022]
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28
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Poncelet J, Rinck F, Ziessel A, Joussain P, Thévenet M, Rouby C, Bensafi M. Semantic knowledge influences prewired hedonic responses to odors. PLoS One 2010; 5:e13878. [PMID: 21079734 PMCID: PMC2975635 DOI: 10.1371/journal.pone.0013878] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2010] [Accepted: 10/11/2010] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Odor hedonic perception relies on decoding the physicochemical properties of odorant molecules and can be influenced in humans by semantic knowledge. The effect of semantic knowledge on such prewired hedonic processing over the life span has remained unclear. METHODOLOGY/PRINCIPAL FINDINGS The present study measured hedonic response to odors in different age groups (children, teenagers, young adults, and seniors) and found that children and seniors, two age groups characterized by either low level of (children) or weak access to (seniors) odor semantic knowledge, processed odor hedonics more on the basis of their physicochemical properties. In contrast, in teenagers and young adults, who show better levels of semantic odor representation, the role of physicochemical properties was less marked. CONCLUSIONS/SIGNIFICANCE These findings demonstrate for the first time that the biological determinants that make an odor pleasant or unpleasant are more powerful at either end of the life span.
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Affiliation(s)
- Johan Poncelet
- Neurosciences Sensorielles, Comportement, Cognition, Université de Lyon and Centre National de la Recherche Scientifique, UMR5020, Lyon, France
| | - Fanny Rinck
- Neurosciences Sensorielles, Comportement, Cognition, Université de Lyon and Centre National de la Recherche Scientifique, UMR5020, Lyon, France
| | - Anne Ziessel
- Neurosciences Sensorielles, Comportement, Cognition, Université de Lyon and Centre National de la Recherche Scientifique, UMR5020, Lyon, France
| | - Pauline Joussain
- Neurosciences Sensorielles, Comportement, Cognition, Université de Lyon and Centre National de la Recherche Scientifique, UMR5020, Lyon, France
| | - Marc Thévenet
- Neurosciences Sensorielles, Comportement, Cognition, Université de Lyon and Centre National de la Recherche Scientifique, UMR5020, Lyon, France
| | - Catherine Rouby
- Neurosciences Sensorielles, Comportement, Cognition, Université de Lyon and Centre National de la Recherche Scientifique, UMR5020, Lyon, France
| | - Moustafa Bensafi
- Neurosciences Sensorielles, Comportement, Cognition, Université de Lyon and Centre National de la Recherche Scientifique, UMR5020, Lyon, France
- * E-mail:
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29
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Rinck F, Barkat-Defradas M, Chakirian A, Joussain P, Bourgeat F, Thevenet M, Rouby C, Bensafi M. Ontogeny of Odor Liking during Childhood and Its Relation to Language Development. Chem Senses 2010; 36:83-91. [DOI: 10.1093/chemse/bjq101] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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