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Okumura T, Kida I, Yokoi A, Nakai T, Nishimoto S, Touhara K, Okamoto M. Semantic context-dependent neural representations of odors in the human piriform cortex revealed by 7T MRI. Hum Brain Mapp 2024; 45:e26681. [PMID: 38656060 PMCID: PMC11041378 DOI: 10.1002/hbm.26681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 03/23/2024] [Accepted: 03/28/2024] [Indexed: 04/26/2024] Open
Abstract
Olfactory perception depends not only on olfactory inputs but also on semantic context. Although multi-voxel activity patterns of the piriform cortex, a part of the primary olfactory cortex, have been shown to represent odor perception, it remains unclear whether semantic contexts modulate odor representation in this region. Here, we investigated whether multi-voxel activity patterns in the piriform cortex change when semantic context modulates odor perception and, if so, whether the modulated areas communicate with brain regions involved in semantic and memory processing beyond the piriform cortex. We also explored regional differences within the piriform cortex, which are influenced by olfactory input and semantic context. We used 2 × 2 combinations of word labels and odorants that were perceived as congruent and measured piriform activity with a 1-mm isotropic resolution using 7T MRI. We found that identical odorants labeled with different words were perceived differently. This labeling effect was observed in multi-voxel activity patterns in the piriform cortex, as the searchlight decoding analysis distinguished identical odors with different labels for half of the examined stimulus pairs. Significant functional connectivity was observed between parts of the piriform cortex that were modulated by labels and regions associated with semantic and memory processing. While the piriform multi-voxel patterns evoked by different olfactory inputs were also distinguishable, the decoding accuracy was significant for only one stimulus pair, preventing definitive conclusions regarding the locational differences between areas influenced by word labels and olfactory inputs. These results suggest that multi-voxel patterns of piriform activity can be modulated by semantic context, possibly due to communication between the piriform cortex and the semantic and memory regions.
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Affiliation(s)
- Toshiki Okumura
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of TokyoTokyoJapan
- Center for Information and Neural Networks (CiNet), National Institute of Information and Communications Technology (NICT)OsakaJapan
| | - Ikuhiro Kida
- Center for Information and Neural Networks (CiNet), National Institute of Information and Communications Technology (NICT)OsakaJapan
- Graduate School of Frontier Biosciences, Osaka UniversityOsakaJapan
| | - Atsushi Yokoi
- Center for Information and Neural Networks (CiNet), National Institute of Information and Communications Technology (NICT)OsakaJapan
- Graduate School of Frontier Biosciences, Osaka UniversityOsakaJapan
| | - Tomoya Nakai
- Center for Information and Neural Networks (CiNet), National Institute of Information and Communications Technology (NICT)OsakaJapan
| | - Shinji Nishimoto
- Center for Information and Neural Networks (CiNet), National Institute of Information and Communications Technology (NICT)OsakaJapan
- Graduate School of Frontier Biosciences, Osaka UniversityOsakaJapan
| | - Kazushige Touhara
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of TokyoTokyoJapan
- International Research Center for Neurointelligence (WPI‐IRCN), Institutes for Advanced Study, The University of TokyoTokyoJapan
| | - Masako Okamoto
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of TokyoTokyoJapan
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2
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Zou L, Qi Y, Shen L, Huang Y, Huang J, Xia Z, Fan M, Fan W, Chai GB, Shi QZ, Zhang Q, Yan C. The neural representations of valence transformation in indole processing. Cereb Cortex 2024; 34:bhae167. [PMID: 38652554 DOI: 10.1093/cercor/bhae167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 03/18/2024] [Accepted: 03/20/2024] [Indexed: 04/25/2024] Open
Abstract
Indole is often associated with a sweet and floral odor typical of jasmine flowers at low concentrations and an unpleasant, animal-like odor at high concentrations. However, the mechanism whereby the brain processes this opposite valence of indole is not fully understood yet. In this study, we aimed to investigate the neural mechanisms underlying indole valence encoding in conversion and nonconversion groups using the smelling task to arouse pleasantness. For this purpose, 12 conversion individuals and 15 nonconversion individuals participated in an event-related functional magnetic resonance imaging paradigm with low (low-indole) and high (high-indole) indole concentrations in which valence was manipulated independent of intensity. The results of this experiment showed that neural activity in the right amygdala, orbitofrontal cortex and insula was associated with valence independent of intensity. Furthermore, activation in the right orbitofrontal cortex in response to low-indole was positively associated with subjective pleasantness ratings. Conversely, activation in the right insula and amygdala in response to low-indole was positively correlated with anticipatory hedonic traits. Interestingly, while amygdala activation in response to high-indole also showed a positive correlation with these hedonic traits, such correlation was observed solely with right insula activation in response to high-indole. Additionally, activation in the right amygdala in response to low-indole was positively correlated with consummatory pleasure and hedonic traits. Regarding olfactory function, only activation in the right orbitofrontal cortex in response to high-indole was positively correlated with olfactory identification, whereas activation in the insula in response to low-indole was negatively correlated with the level of self-reported olfactory dysfunction. Based on these findings, valence transformation of indole processing in the right orbitofrontal cortex, insula, and amygdala may be associated with individual hedonic traits and perceptual differences.
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Affiliation(s)
- Laiquan Zou
- Chemical Senses and Mental Health Lab, Department of Psychology, School of Public Health, Southern Medical University, South Shatai Road 1023, Guangzhou 510515, China
| | - Yue Qi
- Chemical Senses and Mental Health Lab, Department of Psychology, School of Public Health, Southern Medical University, South Shatai Road 1023, Guangzhou 510515, China
| | - Lei Shen
- Key Laboratory of Brain Functional Genomics (MOE & STCSM), Shanghai Changning-ECNU Mental Health Center, School of Psychology and Cognitive Science, East China Normal University, North Zhongshan Road 3663, Shanghai 200062, China
- Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, North Zhongshan Road 3663, Shanghai 20062, China
| | - Yanyang Huang
- Chemical Senses and Mental Health Lab, Department of Psychology, School of Public Health, Southern Medical University, South Shatai Road 1023, Guangzhou 510515, China
| | - Jiayu Huang
- Chemical Senses and Mental Health Lab, Department of Psychology, School of Public Health, Southern Medical University, South Shatai Road 1023, Guangzhou 510515, China
| | - Zheng Xia
- Key Laboratory of Brain Functional Genomics (MOE & STCSM), Shanghai Changning-ECNU Mental Health Center, School of Psychology and Cognitive Science, East China Normal University, North Zhongshan Road 3663, Shanghai 200062, China
- Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, North Zhongshan Road 3663, Shanghai 20062, China
| | - Mingxia Fan
- Key Laboratory of Brain Functional Genomics (MOE & STCSM), Shanghai Changning-ECNU Mental Health Center, School of Psychology and Cognitive Science, East China Normal University, North Zhongshan Road 3663, Shanghai 200062, China
| | - Wu Fan
- Zhengzhou Tobacco Research Institute of CNTC, Fengyang Road 2, Zhengzhou 450001, China
| | - Guo-Bi Chai
- Zhengzhou Tobacco Research Institute of CNTC, Fengyang Road 2, Zhengzhou 450001, China
| | - Qing-Zhao Shi
- Zhengzhou Tobacco Research Institute of CNTC, Fengyang Road 2, Zhengzhou 450001, China
| | - Qidong Zhang
- Zhengzhou Tobacco Research Institute of CNTC, Fengyang Road 2, Zhengzhou 450001, China
| | - Chao Yan
- Key Laboratory of Brain Functional Genomics (MOE & STCSM), Shanghai Changning-ECNU Mental Health Center, School of Psychology and Cognitive Science, East China Normal University, North Zhongshan Road 3663, Shanghai 200062, China
- Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, North Zhongshan Road 3663, Shanghai 20062, China
- Key Laboratory of Philosophy and Social Science of Anhui Province on Adolescent Mental Health and Crisis Intelligence Intervention, South Jiuhua Road 189, Hefei 241002, China
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3
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Edmonds D, Salvo JJ, Anderson N, Lakshman M, Yang Q, Kay K, Zelano C, Braga RM. Social cognitive regions of human association cortex are selectively connected to the amygdala. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2023.12.06.570477. [PMID: 38106046 PMCID: PMC10723387 DOI: 10.1101/2023.12.06.570477] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2023]
Abstract
Reasoning about someone's thoughts and intentions - i.e., forming a theory of mind - is an important aspect of social cognition that relies on association areas of the brain that have expanded disproportionately in the human lineage. We recently showed that these association zones comprise parallel distributed networks that, despite occupying adjacent and interdigitated regions, serve dissociable functions. One network is selectively recruited by theory of mind processes. What circuit properties differentiate these parallel networks? Here, we show that social cognitive association areas are intrinsically and selectively connected to regions of the anterior medial temporal lobe that are implicated in emotional learning and social behaviors, including the amygdala at or near the basolateral complex and medial nucleus. The results suggest that social cognitive functions emerge through coordinated activity between amygdala circuits and a distributed association network, and indicate the medial nucleus may play an important role in social cognition in humans.
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Affiliation(s)
- Donnisa Edmonds
- Department of Neurology, Northwestern University, Chicago, IL, USA
| | - Joseph J. Salvo
- Department of Neurology, Northwestern University, Chicago, IL, USA
| | - Nathan Anderson
- Department of Neurology, Northwestern University, Chicago, IL, USA
| | - Maya Lakshman
- Department of Neurology, Northwestern University, Chicago, IL, USA
| | - Qiaohan Yang
- Department of Neurology, Northwestern University, Chicago, IL, USA
| | - Kendrick Kay
- Department of Radiology, University of Minnesota, Minneapolis, MN, USA
| | - Christina Zelano
- Department of Neurology, Northwestern University, Chicago, IL, USA
| | - Rodrigo M. Braga
- Department of Neurology, Northwestern University, Chicago, IL, USA
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Ai Y, Hummel T, Nie H, Yang J, Han P. Reduced neural responses to pleasant odor stimuli after acute psychological stress is associated with cortisol reactivity. Neuroimage 2023; 284:120474. [PMID: 38008298 DOI: 10.1016/j.neuroimage.2023.120474] [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: 09/21/2023] [Revised: 11/07/2023] [Accepted: 11/23/2023] [Indexed: 11/28/2023] Open
Abstract
Acute stress alters olfactory perception. However, little is known about the neural processing of olfactory stimuli after acute stress exposure and the role of cortisol in such an effect. Here, we used an event-related olfactory fMRI paradigm to investigate brain responses to odors of different valence (unpleasant, pleasant, or neutral) in healthy young adults following an acute stress (Trier Social Stress Test, TSST) induction (N = 22) or a non-stressful resting condition (N = 22). We obtained the odor pleasantness, intensity, and familiarity ratings after the acute stress induction or resting condition. We also measured the participants' perceived stress and salivary cortisol at four time points during the procedure. We found a stress-related decrease in brain activation in response to the pleasant, but not to the neutral or unpleasant odor stimuli in the right piriform cortex extending to the right amygdala, the right orbitofrontal cortex, and the right insula. In addition, activation of clusters within the regions of interest were negatively associated with individual baseline-to-peak increase in salivary cortisol levels after stress. We also found increased functional connectivity between the right piriform cortex and the right insula after stress when the pleasant odor was presented. The strength of the connectivity was positively correlated with increased perceived stress levels immediately after stress exposure. These results provide novel evidence for the effects of acute stress in attenuating the neural processing of a pleasant olfactory stimulus. Together with previous findings, the effect of acute stress on human olfactory perception appears to depend on both the valence and the concentration (e.g., peri-threshold or suprathreshold levels) of odor stimuli.
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Affiliation(s)
- Yun Ai
- Faculty of Psychology, Southwest University, Chongqing, China; MOE Key Laboratory of Cognition and Personality, Southwest University, Chongqing, China
| | - Thomas Hummel
- Interdisciplinary Centre Smell and Taste, Department of Otorhinolaryngology, TU Dresden, Dresden, Germany
| | - Haoyu Nie
- Faculty of Psychology, Southwest University, Chongqing, China
| | - Juan Yang
- Faculty of Psychology, Southwest University, Chongqing, China; MOE Key Laboratory of Cognition and Personality, Southwest University, Chongqing, China
| | - Pengfei Han
- Faculty of Psychology, Southwest University, Chongqing, China; MOE Key Laboratory of Cognition and Personality, Southwest University, Chongqing, China.
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5
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Chen H, Wu Y, He C, Long M, Liu G, Ni H, Yin J. Improvement of olfactory fMRI activation and hemodynamic response function curve with respiration correction. J Neurosci Methods 2023; 386:109782. [PMID: 36610616 DOI: 10.1016/j.jneumeth.2023.109782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 11/05/2022] [Accepted: 01/02/2023] [Indexed: 01/05/2023]
Abstract
BACKGROUND Odor perception is highly dependent on respiration, however, the asynchronization between inspiration and odor delivery results in a decreased activation and hemodynamic response function (HRF) curve in olfactory functional MRI (fMRI). This study aimed to investigate the effect of a data post-processing method to minimize the asynchronization and consequently improve the olfactory activation and HRF curve and compare it between different TRs (3 s and 1 s). NEW METHOD A new data post-processing method of respiration correction based on olfactory perception was investigated. COMPARISON WITH EXISTING METHODS The odor stimuli of olfactory fMRI were mostly based on odor deliveries. But for the reason of respiration, the time of olfactory perception might be a little different. The actual onset time and duration of odor stimuli were modified based on the respiration data. RESULTS For 3 s TR data, an increased number of activated voxels and higher HRF curves response height were obtained with the respiration correction method in the primary olfactory cortex (POC) (P = 0.034 and 0.009) and insula (P = 0.024 and 0.001), compared with the uncorrected method. But the activated voxels and response height of the anterior cingulate cortex (ACC) did not differ between uncorrected and respiration correction methods (P = 0.102 and 0.200). The time to peak of the HRF curve was shorter with the respiration correction method in all ROIs (all P < 0.05), compared with the uncorrected method. Whereas there were no significant differences between the uncorrected and corrected results for 1 s TR data. CONCLUSIONS The post-processing method of respiration correction could effectively minimize the asynchronization between respirations and odor deliveries, and improve the activations and HRF curves for a routine 3 s TR olfactory fMRI data.
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Affiliation(s)
- Hong Chen
- Tangshan Workers' Hospital, Tangshan, Hebei Province 063000, China
| | - Yalin Wu
- The First Central Clinical College of Tianjin Medical University, Tianjin 300070, China
| | - Che He
- The First Central Clinical College of Tianjin Medical University, Tianjin 300070, China
| | - Miaomiao Long
- Department of Radiology, Tianjin First Central Hospital, Tianjin Medical Imaging Institution, Tianjin 300192, China
| | - Guoping Liu
- Department of Neurology, Tianjin First Central Hospital, Tianjin 300192, China
| | - Hongyan Ni
- Department of Radiology, Tianjin First Central Hospital, Tianjin Medical Imaging Institution, Tianjin 300192, China
| | - Jianzhong Yin
- Department of Radiology, Haikou People's Hospital, Affiliated Haikou Hospital of Xiangya Medical school, Central South University, Haikou, Hainan Province 570208, China.
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Kulason S, Ratnanather JT, Miller MI, Kamath V, Hua J, Yang K, Ma M, Ishizuka K, Sawa A. A comparative neuroimaging perspective of olfaction and higher-order olfactory processing: on health and disease. Semin Cell Dev Biol 2022; 129:22-30. [PMID: 34462249 PMCID: PMC9900497 DOI: 10.1016/j.semcdb.2021.08.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2021] [Accepted: 08/18/2021] [Indexed: 02/08/2023]
Abstract
Olfactory dysfunction is often the earliest indicator of disease in a range of neurological and psychiatric disorders. One tempting working hypothesis is that pathological changes in the peripheral olfactory system where the body is exposed to many adverse environmental stressors may have a causal role for the brain alteration. Whether and how the peripheral pathology spreads to more central brain regions may be effectively studied in rodent models, and there is successful precedence in experimental models for Parkinson's disease. It is of interest to study whether a similar mechanism may underlie the pathology of psychiatric illnesses, such as schizophrenia. However, direct comparison between rodent models and humans includes challenges under light of comparative neuroanatomy and experimental methodologies used in these two distinct species. We believe that neuroimaging modality that has been the main methodology of human brain studies may be a useful viewpoint to address and fill the knowledge gap between rodents and humans in this scientific question. Accordingly, in the present review article, we focus on brain imaging studies associated with olfaction in healthy humans and patients with neurological and psychiatric disorders, and if available those in rodents. We organize this review article at three levels: 1) olfactory bulb (OB) and peripheral structures of the olfactory system, 2) primary olfactory cortical and subcortical regions, and 3) associated higher-order cortical regions. This research area is still underdeveloped, and we acknowledge that further validation with independent cohorts may be needed for many studies presented here, in particular those with human subjects. Nevertheless, whether and how peripheral olfactory disturbance impacts brain function is becoming even a hotter topic in the ongoing COVID-19 pandemic, given the risk of long-term changes of mental status associated with olfactory infection of SARS-CoV-2. Together, in this review article, we introduce this underdeveloped but important research area focusing on its implications in neurological and psychiatric disorders, with several pioneered publications.
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Affiliation(s)
- Sue Kulason
- Center for Imaging Science, Johns Hopkins University, Baltimore, MD, USA; Institute for Computational Medicine, Johns Hopkins University, Baltimore, MD, USA; Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, USA
| | - J Tilak Ratnanather
- Center for Imaging Science, Johns Hopkins University, Baltimore, MD, USA; Institute for Computational Medicine, Johns Hopkins University, Baltimore, MD, USA; Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, USA
| | - Michael I Miller
- Center for Imaging Science, Johns Hopkins University, Baltimore, MD, USA; Institute for Computational Medicine, Johns Hopkins University, Baltimore, MD, USA; Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, USA
| | - Vidyulata Kamath
- Department of Psychiatry, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Jun Hua
- Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD, USA; F.M. Kirby Research Center for Functional Brain Imaging, Kennedy Krieger Institute, Baltimore, MD, USA
| | - Kun Yang
- Department of Psychiatry, Johns Hopkins School of Medicine, Baltimore, MD, USA; Johns Hopkins Schizophrenia Center, Baltimore, MD, USA
| | - Minghong Ma
- Department of Neuroscience, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Koko Ishizuka
- Department of Psychiatry, Johns Hopkins School of Medicine, Baltimore, MD, USA; Johns Hopkins Schizophrenia Center, Baltimore, MD, USA
| | - Akira Sawa
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, USA; Department of Psychiatry, Johns Hopkins School of Medicine, Baltimore, MD, USA; Johns Hopkins Schizophrenia Center, Baltimore, MD, USA; Department of Neuroscience, Johns Hopkins School of Medicine, Baltimore, MD, USA; Department of Mental Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA.
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7
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Winkelmeier L, Filosa C, Hartig R, Scheller M, Sack M, Reinwald JR, Becker R, Wolf D, Gerchen MF, Sartorius A, Meyer-Lindenberg A, Weber-Fahr W, Clemm von Hohenberg C, Russo E, Kelsch W. Striatal hub of dynamic and stabilized prediction coding in forebrain networks for olfactory reinforcement learning. Nat Commun 2022; 13:3305. [PMID: 35676281 PMCID: PMC9177857 DOI: 10.1038/s41467-022-30978-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Accepted: 05/19/2022] [Indexed: 11/13/2022] Open
Abstract
Identifying the circuits responsible for cognition and understanding their embedded computations is a challenge for neuroscience. We establish here a hierarchical cross-scale approach, from behavioral modeling and fMRI in task-performing mice to cellular recordings, in order to disentangle local network contributions to olfactory reinforcement learning. At mesoscale, fMRI identifies a functional olfactory-striatal network interacting dynamically with higher-order cortices. While primary olfactory cortices respectively contribute only some value components, the downstream olfactory tubercle of the ventral striatum expresses comprehensively reward prediction, its dynamic updating, and prediction error components. In the tubercle, recordings reveal two underlying neuronal populations with non-redundant reward prediction coding schemes. One population collectively produces stabilized predictions as distributed activity across neurons; in the other, neurons encode value individually and dynamically integrate the recent history of uncertain outcomes. These findings validate a cross-scale approach to mechanistic investigations of higher cognitive functions in rodents. Where and how the brain learns from experience is not fully understood. Here the authors use a hierarchical approach from behavioural modelling to systems fMRI to cellular coding reveals brain mechanisms for history informed updating of future predictions.
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Affiliation(s)
- Laurens Winkelmeier
- Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, 68159, Mannheim, Germany
| | - Carla Filosa
- Department of Psychiatry and Psychotherapy, University Medical Center, Johannes Gutenberg University, 55131, Mainz, Germany
| | - Renée Hartig
- Department of Psychiatry and Psychotherapy, University Medical Center, Johannes Gutenberg University, 55131, Mainz, Germany
| | - Max Scheller
- Department of Psychiatry and Psychotherapy, University Medical Center, Johannes Gutenberg University, 55131, Mainz, Germany
| | - Markus Sack
- Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, 68159, Mannheim, Germany
| | - Jonathan R Reinwald
- Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, 68159, Mannheim, Germany
| | - Robert Becker
- Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, 68159, Mannheim, Germany
| | - David Wolf
- Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, 68159, Mannheim, Germany
| | - Martin Fungisai Gerchen
- Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, 68159, Mannheim, Germany
| | - Alexander Sartorius
- Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, 68159, Mannheim, Germany
| | - Andreas Meyer-Lindenberg
- Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, 68159, Mannheim, Germany
| | - Wolfgang Weber-Fahr
- Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, 68159, Mannheim, Germany
| | | | - Eleonora Russo
- Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, 68159, Mannheim, Germany.,Department of Psychiatry and Psychotherapy, University Medical Center, Johannes Gutenberg University, 55131, Mainz, Germany
| | - Wolfgang Kelsch
- Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, 68159, Mannheim, Germany. .,Department of Psychiatry and Psychotherapy, University Medical Center, Johannes Gutenberg University, 55131, Mainz, Germany.
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8
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Spatiotemporal dynamics of odor representations in the human brain revealed by EEG decoding. Proc Natl Acad Sci U S A 2022; 119:e2114966119. [PMID: 35584113 PMCID: PMC9173780 DOI: 10.1073/pnas.2114966119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
Abstract
To elucidate when and where in the brain different aspects of odor perception emerge, we decoded odors from an electroencephalogram and associated the results with perception and source activities. The odor information was decoded 100 ms after odor onset at the earliest, with its signal sources estimated in and around the olfactory areas. The neural representation of odor unpleasantness emerged 300 ms after odor onset, followed by pleasantness and perceived quality at 500 ms. During this time, brain regions representing odor information spread rapidly from the olfactory areas to regions associated with emotional, semantic, and memory processing. The results suggested that odor perception emerges through computations in these areas, with different perceptual aspects having different spatiotemporal dynamics. How the human brain translates olfactory inputs into diverse perceptions, from pleasurable floral smells to sickening smells of decay, is one of the fundamental questions in olfaction. To examine how different aspects of olfactory perception emerge in space and time in the human brain, we performed time-resolved multivariate pattern analysis of scalp-recorded electroencephalogram responses to 10 perceptually diverse odors and associated the resulting decoding accuracies with perception and source activities. Mean decoding accuracies of odors exceeded the chance level 100 ms after odor onset and reached maxima at 350 ms. The result suggests that the neural representations of individual odors were maximally separated at 350 ms. Perceptual representations emerged following the decoding peak: unipolar unpleasantness (neutral to unpleasant) from 300 ms, and pleasantness (neutral to pleasant) and perceptual quality (applicability to verbal descriptors such as “fruity” or “flowery”) from 500 ms after odor onset, with all these perceptual representations reaching their maxima after 600 ms. A source estimation showed that the areas representing the odor information, estimated based on the decoding accuracies, were localized in and around the primary and secondary olfactory areas at 100 to 350 ms after odor onset. Odor representations then expanded into larger areas associated with emotional, semantic, and memory processing, with the activities of these later areas being significantly associated with perception. These results suggest that initial odor information coded in the olfactory areas (<350 ms) evolves into their perceptual realizations (300 to >600 ms) through computations in widely distributed cortical regions, with different perceptual aspects having different spatiotemporal dynamics.
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9
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Cavelius M, Brunel T, Didier A. Lessons from behavioral lateralization in olfaction. Brain Struct Funct 2021; 227:685-696. [PMID: 34596756 PMCID: PMC8843900 DOI: 10.1007/s00429-021-02390-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 09/19/2021] [Indexed: 11/16/2022]
Abstract
Sensory information, sampled by sensory organs positioned on each side of the body may play a crucial role in organizing brain lateralization. This question is of particular interest with regard to the growing evidence of alteration in lateralization in several psychiatric conditions. In this context, the olfactory system, an ancient, mostly ipsilateral and well-conserved system across phylogeny may prove an interesting model system to understand the behavioral significance of brain lateralization. Here, we focused on behavioral data in vertebrates and non-vertebrates, suggesting that the two hemispheres of the brain differentially processed olfactory cues to achieve diverse sensory operations, such as detection, discrimination, identification of behavioral valuable cues or learning. These include reports across different species on best performances with one nostril or the other or odorant active sampling by one nostril or the other, depending on odorants or contexts. In some species, hints from peripheral anatomical or functional asymmetry were proposed to explain these asymmetries in behavior. Instigations of brain activation or more rarely of brain connectivity evoked by odorants revealed a complex picture with regards to asymmetric patterns which is discussed with respect to behavioral data. Along the steps of the discussed literature, we propose avenues for future research.
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Affiliation(s)
- Matthias Cavelius
- Lyon Neuroscience Research Center (CRNL), Neuropop Team, Lyon, France.,CNRS 5292, Inserm 1028, Lyon 1 University, Lyon, France
| | - Théo Brunel
- Lyon Neuroscience Research Center (CRNL), Neuropop Team, Lyon, France.,CNRS 5292, Inserm 1028, Lyon 1 University, Lyon, France
| | - Anne Didier
- Lyon Neuroscience Research Center (CRNL), Neuropop Team, Lyon, France. .,CNRS 5292, Inserm 1028, Lyon 1 University, Lyon, France.
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10
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Midroit M, Chalençon L, Renier N, Milton A, Thevenet M, Sacquet J, Breton M, Forest J, Noury N, Richard M, Raineteau O, Ferdenzi C, Fournel A, Wesson DW, Bensafi M, Didier A, Mandairon N. Neural processing of the reward value of pleasant odorants. Curr Biol 2021; 31:1592-1605.e9. [PMID: 33607032 DOI: 10.1016/j.cub.2021.01.066] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 01/07/2021] [Accepted: 01/19/2021] [Indexed: 02/07/2023]
Abstract
Pleasant odorants are represented in the posterior olfactory bulb (pOB) in mice. How does this hedonic information generate odor-motivated behaviors? Using optogenetics, we report here that stimulating the representation of pleasant odorants in a sensory structure, the pOB, can be rewarding, self-motivating, and is accompanied by ventral tegmental area activation. To explore the underlying neural circuitry downstream of the olfactory bulb (OB), we use 3D high-resolution imaging and optogenetics and determine that the pOB preferentially projects to the olfactory tubercle, whose increased activity is related to odorant attraction. We further show that attractive odorants act as reinforcers in dopamine-dependent place preference learning. Finally, we extend those findings to humans, who exhibit place preference learning and an increase BOLD signal in the olfactory tubercle in response to attractive odorants. Thus, strong and persistent attraction induced by some odorants is due to a direct gateway from the pOB to the reward system.
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Affiliation(s)
- Maëllie Midroit
- CNRS, UMR 5292, INSERM, U1028, Lyon Neuroscience Research Center, Neuroplasticity and Neuropathology of Olfactory Perception Team, Lyon 69000, France; University Lyon, Lyon, 69000, France; University Lyon 1, Villeurbanne 69000, France
| | - Laura Chalençon
- CNRS, UMR 5292, INSERM, U1028, Lyon Neuroscience Research Center, Neuroplasticity and Neuropathology of Olfactory Perception Team, Lyon 69000, France; University Lyon, Lyon, 69000, France; University Lyon 1, Villeurbanne 69000, France
| | - Nicolas Renier
- Sorbonne Universités, Paris Brain Institute, ICM, Inserm, CNRS, Paris, France
| | - Adrianna Milton
- Department of Neurosciences, Case Western Reserve University, 2109 Adelbert Road, Cleveland, OH 44106, USA
| | - Marc Thevenet
- CNRS, UMR 5292, INSERM, U1028, Lyon Neuroscience Research Center, Neuroplasticity and Neuropathology of Olfactory Perception Team, Lyon 69000, France; University Lyon, Lyon, 69000, France; University Lyon 1, Villeurbanne 69000, France
| | - Joëlle Sacquet
- CNRS, UMR 5292, INSERM, U1028, Lyon Neuroscience Research Center, Neuroplasticity and Neuropathology of Olfactory Perception Team, Lyon 69000, France; University Lyon, Lyon, 69000, France; University Lyon 1, Villeurbanne 69000, France
| | - Marine Breton
- CNRS, UMR 5292, INSERM, U1028, Lyon Neuroscience Research Center, Neuroplasticity and Neuropathology of Olfactory Perception Team, Lyon 69000, France; University Lyon, Lyon, 69000, France; University Lyon 1, Villeurbanne 69000, France
| | - Jérémy Forest
- CNRS, UMR 5292, INSERM, U1028, Lyon Neuroscience Research Center, Neuroplasticity and Neuropathology of Olfactory Perception Team, Lyon 69000, France; University Lyon, Lyon, 69000, France; University Lyon 1, Villeurbanne 69000, France
| | - Norbert Noury
- CNRS, UMR5270, Institute Nanotechnology Lyon, Biomedical Sensors Group, University of Lyon 1, Villeurbanne 69621, France
| | - Marion Richard
- CNRS, UMR 5292, INSERM, U1028, Lyon Neuroscience Research Center, Neuroplasticity and Neuropathology of Olfactory Perception Team, Lyon 69000, France; University Lyon, Lyon, 69000, France; University Lyon 1, Villeurbanne 69000, France
| | - Olivier Raineteau
- University Lyon, Université Claude Bernard Lyon 1, Inserm, Stem Cell and Brain Research Institute U1208, 69500 Bron, France
| | - Camille Ferdenzi
- CNRS, UMR 5292, INSERM, U1028, Lyon Neuroscience Research Center, Neuroplasticity and Neuropathology of Olfactory Perception Team, Lyon 69000, France; University Lyon, Lyon, 69000, France; University Lyon 1, Villeurbanne 69000, France
| | - Arnaud Fournel
- CNRS, UMR 5292, INSERM, U1028, Lyon Neuroscience Research Center, Neuroplasticity and Neuropathology of Olfactory Perception Team, Lyon 69000, France; University Lyon, Lyon, 69000, France; University Lyon 1, Villeurbanne 69000, France
| | - Daniel W Wesson
- Department of Pharmacology & Therapeutics, University of Florida, 1200 Newell Drive, Gainesville, FL 32610, USA
| | - Moustafa Bensafi
- CNRS, UMR 5292, INSERM, U1028, Lyon Neuroscience Research Center, Neuroplasticity and Neuropathology of Olfactory Perception Team, Lyon 69000, France; University Lyon, Lyon, 69000, France; University Lyon 1, Villeurbanne 69000, France
| | - Anne Didier
- CNRS, UMR 5292, INSERM, U1028, Lyon Neuroscience Research Center, Neuroplasticity and Neuropathology of Olfactory Perception Team, Lyon 69000, France; University Lyon, Lyon, 69000, France; University Lyon 1, Villeurbanne 69000, France
| | - Nathalie Mandairon
- CNRS, UMR 5292, INSERM, U1028, Lyon Neuroscience Research Center, Neuroplasticity and Neuropathology of Olfactory Perception Team, Lyon 69000, France; University Lyon, Lyon, 69000, France; University Lyon 1, Villeurbanne 69000, France.
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11
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Abstract
We rapidly classify odors as pleasant or aversive, but the brain circuits underlying how odors motivate approach and avoidance responses are largely unknown. New research describes a direct path from the olfactory bulb to ventral striatum driving odor-mediated reward.
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12
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Müschenich FS, Sichtermann T, Di Francesco ME, Rodriguez-Raecke R, Heim L, Singer M, Wiesmann M, Freiherr J. Some like it, some do not: behavioral responses and central processing of olfactory-trigeminal mixture perception. Brain Struct Funct 2020; 226:247-261. [PMID: 33355693 PMCID: PMC7817597 DOI: 10.1007/s00429-020-02178-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Accepted: 11/10/2020] [Indexed: 11/26/2022]
Abstract
Exploring the potential of eucalyptol as a masking agent for aversive odors, we found that eucalyptol masks the olfactory but not the trigeminal sensation of ammonia in a previous study. Here, we further investigate the processing of a mixture consisting of eucalyptol and ammonia, two olfactory–trigeminal stimuli. We presented the two pure odors and a mixture thereof to 33 healthy participants. The nostrils were stimulated alternately (monorhinal application). We analyzed the behavioral ratings (intensity and pleasantness) and functional brain images. First, we replicated our previous finding that, within the mixture, the eucalyptol component suppressed the olfactory intensity of the ammonia component. Second, mixture pleasantness was rated differently by participants depending on which component dominated their mixture perception. Approximately half of the volunteers rated the eucalyptol component as more intense and evaluated the mixture as pleasant (pleasant group). The other half rated the ammonia component as more intense and evaluated the mixture as unpleasant (unpleasant group). Third, these individual differences were also found in functional imaging data. Contrasting the mixture either to eucalyptol or to both single odors, neural activation was found in the unpleasant group only. Activation in the anterior insula and SII was interpreted as evidence for an attentional shift towards the potentially threatening mixture component ammonia and for trigeminal enhancement. In addition to insula and SII, further regions of the pain matrix were involved when assessing all participant responses to the mixture. Both a painful sensation and an attentional shift towards the unpleasant mixture component complicates the development of an efficient mask because a pleasant perception is an important requirement for malodor coverage.
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Affiliation(s)
- Franziska S Müschenich
- Diagnostic and Interventional Neuroradiology, University Hospital, RWTH Aachen University, Pauwelsstraße 30, 52074, Aachen, Germany.
| | - Thorsten Sichtermann
- Diagnostic and Interventional Neuroradiology, University Hospital, RWTH Aachen University, Pauwelsstraße 30, 52074, Aachen, Germany
| | - Maria Elisa Di Francesco
- Diagnostic and Interventional Neuroradiology, University Hospital, RWTH Aachen University, Pauwelsstraße 30, 52074, Aachen, Germany
| | - Rea Rodriguez-Raecke
- Diagnostic and Interventional Neuroradiology, University Hospital, RWTH Aachen University, Pauwelsstraße 30, 52074, Aachen, Germany
| | - Lennart Heim
- Diagnostic and Interventional Neuroradiology, University Hospital, RWTH Aachen University, Pauwelsstraße 30, 52074, Aachen, Germany
| | | | - Martin Wiesmann
- Diagnostic and Interventional Neuroradiology, University Hospital, RWTH Aachen University, Pauwelsstraße 30, 52074, Aachen, Germany
| | - Jessica Freiherr
- Diagnostic and Interventional Neuroradiology, University Hospital, RWTH Aachen University, Pauwelsstraße 30, 52074, Aachen, Germany.,Department of Psychiatry and Psychotherapy, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany.,Sensory Analytics, Fraunhofer Institute for Process Engineering and Packaging IVV, Freising, Germany
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13
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Kryklywy JH, Ehlers MR, Anderson AK, Todd RM. From Architecture to Evolution: Multisensory Evidence of Decentralized Emotion. Trends Cogn Sci 2020; 24:916-929. [DOI: 10.1016/j.tics.2020.08.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 08/04/2020] [Accepted: 08/12/2020] [Indexed: 12/15/2022]
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14
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Liu Y, Toet A, Krone T, van Stokkum R, Eijsman S, van Erp JBF. A network model of affective odor perception. PLoS One 2020; 15:e0236468. [PMID: 32730278 PMCID: PMC7392242 DOI: 10.1371/journal.pone.0236468] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2019] [Accepted: 07/07/2020] [Indexed: 01/10/2023] Open
Abstract
The affective appraisal of odors is known to depend on their intensity (I), familiarity (F), detection threshold (T), and on the baseline affective state of the observer. However, the exact nature of these relations is still largely unknown. We therefore performed an observer experiment in which participants (N = 52) smelled 40 different odors (varying widely in hedonic valence) and reported the intensity, familiarity and their affective appraisal (valence and arousal: V and A) for each odor. Also, we measured the baseline affective state (valence and arousal: BV and BA) and odor detection threshold of the participants. Analyzing the results for pleasant and unpleasant odors separately, we obtained two models through network analysis. Several relations that have previously been reported in the literature also emerge in both models (the relations between F and I, F and V, I and A; I and V, BV and T). However, there are also relations that do not emerge (between BA and V, BV and I, and T and I) or that appear with a different polarity (the relation between F and A for pleasant odors). Intensity (I) has the largest impact on the affective appraisal of unpleasant odors, while F significantly contributes to the appraisal of pleasant odors. T is only affected by BV and has no effect on other variables. This study is a first step towards an integral study of the affective appraisal of odors through network analysis. Future studies should also include other factors that are known to influence odor appraisal, such as age, gender, personality, and culture.
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Affiliation(s)
- Yingxuan Liu
- Perceptual and Cognitive Systems, TNO, Soesterberg, The Netherlands
| | - Alexander Toet
- Perceptual and Cognitive Systems, TNO, Soesterberg, The Netherlands
| | - Tanja Krone
- Risk Analysis for Products in Development RAPID, TNO, Zeist, The Netherlands
| | - Robin van Stokkum
- Risk Analysis for Products in Development RAPID, TNO, Zeist, The Netherlands
| | - Sophia Eijsman
- Perceptual and Cognitive Systems, TNO, Soesterberg, The Netherlands
| | - Jan B. F. van Erp
- Perceptual and Cognitive Systems, TNO, Soesterberg, The Netherlands
- Research Group Human Media Interaction, University of Twente, Enschede, The Netherlands
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15
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Lane G, Zhou G, Noto T, Zelano C. Assessment of direct knowledge of the human olfactory system. Exp Neurol 2020; 329:113304. [PMID: 32278646 DOI: 10.1016/j.expneurol.2020.113304] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Revised: 01/13/2020] [Accepted: 04/08/2020] [Indexed: 12/31/2022]
Affiliation(s)
- Gregory Lane
- Northwestern University Feinberg School of Medicine, Department of Neurology, 303 E Chicago Ave, Chicago, IL 60611, USA.
| | - Guangyu Zhou
- Northwestern University Feinberg School of Medicine, Department of Neurology, 303 E Chicago Ave, Chicago, IL 60611, USA.
| | - Torben Noto
- Northwestern University Feinberg School of Medicine, Department of Neurology, 303 E Chicago Ave, Chicago, IL 60611, USA
| | - Christina Zelano
- Northwestern University Feinberg School of Medicine, Department of Neurology, 303 E Chicago Ave, Chicago, IL 60611, USA
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16
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Okamoto K, Shiga H, Nakamura H, Matsui M, Miwa T. Relationship Between Olfactory Disturbance After Acute Ischemic Stroke and Latent Thalamic Hypoperfusion. Chem Senses 2020; 45:111-118. [PMID: 31873732 DOI: 10.1093/chemse/bjz077] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Odor detection, recognition, and identification were assessed in 19 acute ischemic stroke patients who had no magnetic resonance imaging-detectable thalamic lesions but in whom technetium-99m ethyl cysteinate dimer single photon emission tomography revealed thalamic hypoperfusion. Although these patients were unaware of reduced olfactory function, they exhibited significantly lower scores in tests for odor identification and recognition threshold as compared with 9 ischemic stroke controls that had normal thalamic hypoperfusion. However, absolute odor detection thresholds were similar in the 2 groups. These results demonstrate the usefulness of cerebral perfusion scintigraphy in assessing sensory loss after ischemic stroke and provide further evidence for the role of the thalamus in olfaction.
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Affiliation(s)
- Kazuhiro Okamoto
- Department of Medical Technology, Kanazawa Medical University Hospital, Uchinada, Japan
| | - Hideaki Shiga
- Department of Otolaryngology, Kanazawa Medical University, Uchinada, Japan
| | - Hisako Nakamura
- Department of Central Clinical Laboratory, Kanazawa Medical University Hospital, Uchinada, Japan
| | - Makoto Matsui
- Department of Neurology, Kanazawa Medical University, Uchinada, Japan
| | - Takaki Miwa
- Department of Otolaryngology, Kanazawa Medical University, Uchinada, Japan
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17
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Mantel M, Ferdenzi C, Roy JM, Bensafi M. Individual Differences as a Key Factor to Uncover the Neural Underpinnings of Hedonic and Social Functions of Human Olfaction: Current Findings from PET and fMRI Studies and Future Considerations. Brain Topogr 2019; 32:977-986. [PMID: 31564029 DOI: 10.1007/s10548-019-00733-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 09/18/2019] [Indexed: 01/20/2023]
Abstract
The hedonic and social dimensions of olfactory perception are characterized by a great diversity across people. Whereas the cerebral processing underlying these aspects of odor perception have been widely explored in the last decades, very few brain imaging studies considered individual differences. This lack of consideration weakens the current models in the field, where the paradigm of universality is the norm. The present review is aimed at examining this issue. Through a synthetic summary, we will first present past studies suggesting that (1) hedonics are represented consistently throughout the olfactory system from primary to secondary areas, with a progressive cognitive modulation and integration with other senses, (2) social dimension of odors may be represented in a distinct pathway involving social and attentional networks. In a second, and more critical part, we will highlight the importance of individual differences for the cerebral study of human olfaction.
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Affiliation(s)
- Marylou Mantel
- Lyon Neuroscience Research Center, University Claude Bernard of Lyon, CNRS, INSERM, Lyon, France.
- Ecole Normale Supérieure de Lyon, Lyon, France.
- Centre Hospitalier Le Vinatier, CRNL, CNRS UMR5292 - Inserm U1028 - UCBL, Bâtiment 462 - Neurocampus, 95 boulevard Pinel, 69675, Bron Cedex, France.
| | - Camille Ferdenzi
- Lyon Neuroscience Research Center, University Claude Bernard of Lyon, CNRS, INSERM, Lyon, France
| | | | - Moustafa Bensafi
- Lyon Neuroscience Research Center, University Claude Bernard of Lyon, CNRS, INSERM, Lyon, France.
- Centre Hospitalier Le Vinatier, CRNL, CNRS UMR5292 - Inserm U1028 - UCBL, Bâtiment 462 - Neurocampus, 95 boulevard Pinel, 69675, Bron Cedex, France.
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18
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Xiao W, Lv Q, Gao X, Sun Z, Yan X, Wei Y. Different Brain Activation in Response to Repeated Odors of Pleasantness and Unpleasantness. CHEMOSENS PERCEPT 2019. [DOI: 10.1007/s12078-019-09270-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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19
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Courtiol E, Buonviso N, Litaudon P. Odorant features differentially modulate beta/gamma oscillatory patterns in anterior versus posterior piriform cortex. Neuroscience 2019; 409:26-34. [PMID: 31022464 DOI: 10.1016/j.neuroscience.2019.04.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 04/09/2019] [Accepted: 04/11/2019] [Indexed: 12/01/2022]
Abstract
Oscillatory activity is a prominent characteristic of the olfactory system. We previously demonstrated that beta and gamma oscillations occurrence in the olfactory bulb (OB) is modulated by the physical properties of the odorant. However, it remains unknown whether such odor-related modulation of oscillatory patterns is maintained in the piriform cortex (PC) and whether those patterns are similar between the anterior PC (aPC) and posterior PC (pPC). The present study was designed to analyze how different odorant molecular features can affect the local field potential (LFP) oscillatory signals in both the aPC and the pPC in anesthetized rats. As reported in the OB, three oscillatory patterns were observed: standard pattern (gamma + beta), gamma-only and beta-only patterns. These patterns occurred with significantly different probabilities in the two PC areas. We observed that odor identity has a strong influence on the probability of occurrence of LFP beta and gamma oscillatory activity in the aPC. Thus, some odor coding mechanisms observed in the OB are retained in the aPC. By contrast, probability of occurrence of different oscillatory patterns is homogeneous in the pPC with beta-only pattern being the most prevalent one for all the different odor families. Overall, our results confirmed the functional heterogeneity of the PC with its anterior part tightly coupled with the OB and mainly encoding odorant features whereas its posterior part activity is not correlated with odorant features but probably more involved in associative and multi-sensory encoding functions.
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Affiliation(s)
- Emmanuelle Courtiol
- Lyon Neuroscience Research Center, "Olfaction: from coding to memory" Team; CNRS UMR5292 - Inserm U1028 - Université Lyon 1-Université de Lyon, Centre Hospitalier Le Vinatier - Bâtiment 462 - Neurocampus, 95 boulevard Pinel, 69675 Bron Cedex, France
| | - Nathalie Buonviso
- Lyon Neuroscience Research Center, "Olfaction: from coding to memory" Team; CNRS UMR5292 - Inserm U1028 - Université Lyon 1-Université de Lyon, Centre Hospitalier Le Vinatier - Bâtiment 462 - Neurocampus, 95 boulevard Pinel, 69675 Bron Cedex, France
| | - Philippe Litaudon
- Lyon Neuroscience Research Center, "Olfaction: from coding to memory" Team; CNRS UMR5292 - Inserm U1028 - Université Lyon 1-Université de Lyon, Centre Hospitalier Le Vinatier - Bâtiment 462 - Neurocampus, 95 boulevard Pinel, 69675 Bron Cedex, France.
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20
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Peng M, Coutts D, Wang T, Cakmak YO. Systematic review of olfactory shifts related to obesity. Obes Rev 2019; 20:325-338. [PMID: 30450791 DOI: 10.1111/obr.12800] [Citation(s) in RCA: 70] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Accepted: 10/07/2018] [Indexed: 02/01/2023]
Abstract
OBJECTIVE The modern food environment is a key driver of rising levels of obesity. While olfaction is known to play a major role in food choice; however, its relationship to obesity is yet to be understood. This review assesses current knowledge of the interaction between obesity and olfaction. METHODS This review is based on observational studies comparing olfactory abilities across weight groups (N = 10) and clinical studies evaluating olfactory changes following bariatric surgery (N = 9). Meta-analyses were performed on data collected by a standard olfactory assessment tool (Sniffin΄ Sticks), to test whether olfaction has any association with body weight or bariatric surgery. RESULTS This review synthesizes findings derived from 38 datasets, with a total of 1432 individual olfactory assessments. The meta-analyses suggest that olfactory function is negatively correlated with body weight. In addition, Roux-en-Y gastric bypass patients frequently report olfactory changes, yet more pronounced and immediate shifts have been observed among sleeve gastrectomy recipients. CONCLUSIONS Our review finds strong evidence for the link between olfaction and obesity and indicates that bariatric surgery (particularly the sleeve gastrectomy) is effective in reversing olfactory decline associated with obesity. In conclusion, we present mechanistic models to underpin the observed relationship between olfaction and obesity.
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Affiliation(s)
- Mei Peng
- Sensory Neuroscience Laboratory, Department of Food Science, University of Otago, Dunedin, New Zealand
| | - Duncan Coutts
- Sensory Neuroscience Laboratory, Department of Food Science, University of Otago, Dunedin, New Zealand
| | - Ting Wang
- Department of Mathematics and Statistics, University of Otago, Dunedin, New Zealand
| | - Yusuf O Cakmak
- Department of Anatomy, University of Otago, Dunedin, New Zealand.,Brain Health Research Centre, Dunedin, New Zealand.,Medical Technologies Centre of Research Excellence, Auckland, New Zealand
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21
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Whitcroft KL, Fischer J, Han P, Raue C, Bensafi M, Gudziol V, Andrews P, Hummel T. Structural Plasticity of the Primary and Secondary Olfactory cortices: Increased Gray Matter Volume Following Surgical Treatment for Chronic Rhinosinusitis. Neuroscience 2018; 395:22-34. [PMID: 30326289 DOI: 10.1016/j.neuroscience.2018.10.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 10/07/2018] [Accepted: 10/08/2018] [Indexed: 01/19/2023]
Abstract
Functional plasticity of the adult brain is well established. Recently, the structural counterpart to such plasticity has been suggested by neuroimaging studies showing experience-dependent differences in gray matter (GM) volumes. Within the primary and secondary olfactory cortices, reduced GM volumes have been demonstrated in patients with olfactory loss. However, these cross-sectional studies do not provide causal evidence for GM volume change, and thereby structural plasticity. Disorders of the peripheral olfactory system, such as chronic rhinosinusitis (CRS), provide an ideal model to study GM structural plasticity, given that patients may experience long periods of olfactory impairment, followed by near complete recovery with treatment. We therefore performed a prospective longitudinal study in patients undergoing surgical treatment for CRS. We used voxel-based morphometry (VBM) to investigate GM volume change in 12 patients (M:F = 7:5; 47.2 ± 14.9 years), 3 months post-op. There was a significant improvement in olfactory function according to birhinal psychophysical testing. We performed a voxel-wise region of interest analysis, with significance corrected for number of regions (p < 0.0036corr). We found significantly increased post-operative GM volumes within the primary (left piriform cortex, right amygdala) and secondary (right orbitofrontal cortex, caudate nucleus, hippocampal-parahippocampal complex and bilateral temporal poles) olfactory networks, and decreased GM volumes within the secondary network only (left caudate nucleus and temporal pole, bilateral hippocampal-parahippocampal complex). As a control measure, we assessed GM change within V1, S1 and A1, where there were no suprathreshold voxels. To our knowledge, this is the first study to demonstrate GM structural plasticity within the primary and secondary olfactory cortices, following restoration of olfaction.
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Affiliation(s)
- K L Whitcroft
- Interdisciplinary Smell and Taste Lab, TU Dresden, Dresden, Germany; UCL Ear Institute, University College London, UK; Centre for the Study of the Senses, Institute of Philosophy, School of Advanced Study, UK; Royal National Throat Nose and Ear Hospital, Department of Rhinology and Facial Plastic Surgery, London, UK.
| | - J Fischer
- Interdisciplinary Smell and Taste Lab, TU Dresden, Dresden, Germany
| | - P Han
- Interdisciplinary Smell and Taste Lab, TU Dresden, Dresden, Germany
| | - C Raue
- Department of Neuroradiology, TU Dresden, Dresden, Germany
| | - M Bensafi
- Department of Psychology, University of Lyon I, Lyon, France
| | - V Gudziol
- Interdisciplinary Smell and Taste Lab, TU Dresden, Dresden, Germany
| | - P Andrews
- UCL Ear Institute, University College London, UK; Royal National Throat Nose and Ear Hospital, Department of Rhinology and Facial Plastic Surgery, London, UK
| | - T Hummel
- Interdisciplinary Smell and Taste Lab, TU Dresden, Dresden, Germany
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22
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Baer T, Coppin G, Porcherot C, Cayeux I, Sander D, Delplanque S. “Dior, J’adore”: The role of contextual information of luxury on emotional responses to perfumes. Food Qual Prefer 2018. [DOI: 10.1016/j.foodqual.2017.12.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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23
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Zhang Z, Zhang H, Wen P, Zhu X, Wang L, Liu Q, Wang J, He X, Wang H, Xu F. Whole-Brain Mapping of the Inputs and Outputs of the Medial Part of the Olfactory Tubercle. Front Neural Circuits 2017; 11:52. [PMID: 28804450 PMCID: PMC5532451 DOI: 10.3389/fncir.2017.00052] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2017] [Accepted: 07/18/2017] [Indexed: 11/13/2022] Open
Abstract
The medial part of the olfactory tubercle (OT) is a brain structure located at the interface of the reward and olfactory system. It is closely related to pheromone-rewards, natural reinforcement, addiction and many other behaviors. However, the structure of the anatomic circuitry of the medial part of the OT is still unclear. In the present study, the medial part of the OT was found to be highly connected with a wide range of brain areas with the help of the pseudorabies virus tracing tool. In order to further investigate the detailed connections for specific neurons, another tracing tool – rabies virus was utilized for D1R-cre and D2R-cre mice. The D1R and D2R neurons in the medial part of the OT were both preferentially innervated by the olfactory areas, especially the piriform cortex, and both had similar direct input patterns. With the help of the adeno-associated virus labeling, it was found that the two subpopulations of neurons primarily innervate with the reward related brain regions, with slightly less axons projecting to the olfactory areas. Thus, the whole-brain input and output circuitry structures for specific types of neurons in the medial part of the OT were systematically investigated, and the results revealed many unique connecting features. This work could provide new insights for further study into the physiological functions of the medial part of the OT.
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Affiliation(s)
- Zhijian Zhang
- College of Life Science and Technology, Huazhong University of Science and TechnologyWuhan, China.,Center for Brain Science, Key Laboratory of Magnetic Resonance in Biological Systems and State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, CAS Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of SciencesWuhan, China.,Wuhan National Laboratory for OptoelectronicsWuhan, China
| | - Hongruo Zhang
- College of Life Sciences, Wuhan UniversityWuhan, China
| | - Pengjie Wen
- Center for Brain Science, Key Laboratory of Magnetic Resonance in Biological Systems and State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, CAS Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of SciencesWuhan, China
| | - Xutao Zhu
- Center for Brain Science, Key Laboratory of Magnetic Resonance in Biological Systems and State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, CAS Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of SciencesWuhan, China
| | - Li Wang
- Center for Brain Science, Key Laboratory of Magnetic Resonance in Biological Systems and State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, CAS Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of SciencesWuhan, China.,Wuhan National Laboratory for OptoelectronicsWuhan, China
| | - Qing Liu
- Center for Brain Science, Key Laboratory of Magnetic Resonance in Biological Systems and State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, CAS Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of SciencesWuhan, China
| | - Jie Wang
- Center for Brain Science, Key Laboratory of Magnetic Resonance in Biological Systems and State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, CAS Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of SciencesWuhan, China
| | - Xiaobin He
- Center for Brain Science, Key Laboratory of Magnetic Resonance in Biological Systems and State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, CAS Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of SciencesWuhan, China
| | - Huadong Wang
- Center for Brain Science, Key Laboratory of Magnetic Resonance in Biological Systems and State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, CAS Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of SciencesWuhan, China
| | - Fuqiang Xu
- Center for Brain Science, Key Laboratory of Magnetic Resonance in Biological Systems and State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, CAS Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of SciencesWuhan, China.,Wuhan National Laboratory for OptoelectronicsWuhan, China.,Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of SciencesShanghai, China
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Joussain P, Bessy M, Fournel A, Ferdenzi C, Rouby C, Delphin-Combe F, Krolak-Salmon P, Bensafi M. Altered Affective Evaluations of Smells in Alzheimer's Disease. J Alzheimers Dis 2016; 49:433-41. [PMID: 26484905 DOI: 10.3233/jad-150332] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Studies of olfaction in Alzheimer's disease (AD) mainly focused on deficits in odor detection and identification, with very few investigations of olfactory emotional changes and their consequences for hedonics. OBJECTIVE The aim of the present study was to characterize affective evaluations of odors in AD patients. METHODS To this end, 20 AD patients and 20 matched controls were tested. Participants were screened for odor detection and identification ability and then asked to rate the intensity, pleasantness, and edibility of 20 odorants. RESULTS Results showed that, overall, AD patients had lower detection ability and perceived all odors as weaker than controls. As expected, they had lower identification ability on both cued and non-cued tasks. In addition, when smelling pleasant odors, patients had significantly lower hedonic ratings than controls (p < 0.02), whereas no group difference was found for neutral or unpleasant odors (p > 0.05 in both cases). Moreover, an analysis combining both intensity and pleasantness ratings showed that whereas intensity increased as a function of pleasantness and unpleasantness in controls, this quadratic relationship was not observed in AD patients. CONCLUSIONS The study suggests that the simplest categorization criteria of odors (intensity and hedonic valence) are impaired in AD patients (especially for pleasant odors).
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Affiliation(s)
- Pauline Joussain
- CNRS UMR5292, INSERM U1028, Lyon Neuroscience Research Center, University Lyon, France
| | - Marion Bessy
- CNRS UMR5292, INSERM U1028, Lyon Neuroscience Research Center, University Lyon, France
| | - Arnaud Fournel
- CNRS UMR5292, INSERM U1028, Lyon Neuroscience Research Center, University Lyon, France
| | - Camille Ferdenzi
- CNRS UMR5292, INSERM U1028, Lyon Neuroscience Research Center, University Lyon, France
| | - Catherine Rouby
- CNRS UMR5292, INSERM U1028, Lyon Neuroscience Research Center, University Lyon, France
| | | | - Pierre Krolak-Salmon
- CNRS UMR5292, INSERM U1028, Lyon Neuroscience Research Center, University Lyon, France.,Hospices Civils de Lyon, France.,Clinical and Research Memory Center of Lyon, France
| | - Moustafa Bensafi
- CNRS UMR5292, INSERM U1028, Lyon Neuroscience Research Center, University Lyon, France
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25
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He W, de Wijk RA, de Graaf C, Boesveldt S. Implicit and Explicit Measurements of Affective Responses to Food Odors. Chem Senses 2016; 41:661-8. [PMID: 27340136 DOI: 10.1093/chemse/bjw068] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
One of the main functions of olfaction is to activate approach/avoidance behavior, toward or away from people, foods, or other odor sources. These behaviors are partly automated and therefore poorly accessible via introspection. Explicit tests need therefore be complemented by implicit tests to provide additional insights into the underlying processes of these behaviors. Affective responses to seven food odors plus one control nonodor were assessed in 28 female participants (18-30 years) using explicit tests [pleasantness, intensity, and non-verbal emotional ratings (PrEmo)] as well as implicit tests that reflect dynamic expressive emotional reactions (facial expressions) as well as behavioral-preparation responses (autonomic nervous system responses: heart rate, skin conductance, and skin temperature). Explicit tests showed significant differences in pleasantness (P < 0.05), and all PrEmo emotions (P < 0.05) except shame. Explicit emotional responses were summarized by valence (explaining 83% of the responses variance) and arousal (14%) as principal components. Early implicit facial and ANS responses (after 1s) seem to reflect the odors' arousal, whereas later ANS responses (after 3-4s) reflected the odors' valence. The results suggest that explicit measures primarily reflect the odors' valence, as result of from relatively long (conscious) processing, which may be less relevant for odor acceptance in the real world where fast and automated processes based on arousal may play a larger role.
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Affiliation(s)
- Wei He
- Consumer Science and Health, Food and Biobased Research, Wageningen University and Research Centre, PO Box 17, 6700 AA Wageningen, The Netherlands and Sensory Science and Eating Behaviour, Division of Human Nutrition, Wageningen University, PO Box 17, 6700 AA Wageningen, The Netherlands
| | - René A de Wijk
- Consumer Science and Health, Food and Biobased Research, Wageningen University and Research Centre, PO Box 17, 6700 AA Wageningen, The Netherlands and
| | - Cees de Graaf
- Sensory Science and Eating Behaviour, Division of Human Nutrition, Wageningen University, PO Box 17, 6700 AA Wageningen, The Netherlands
| | - Sanne Boesveldt
- Sensory Science and Eating Behaviour, Division of Human Nutrition, Wageningen University, PO Box 17, 6700 AA Wageningen, The Netherlands
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26
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Pichon AM, Coppin G, Cayeux I, Porcherot C, Sander D, Delplanque S. Sensitivity of Physiological Emotional Measures to Odors Depends on the Product and the Pleasantness Ranges Used. Front Psychol 2015; 6:1821. [PMID: 26648888 PMCID: PMC4664615 DOI: 10.3389/fpsyg.2015.01821] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Accepted: 11/11/2015] [Indexed: 12/21/2022] Open
Abstract
Emotions are characterized by synchronized changes in several components of an organism. Among them, physiological variations provide energy support for the expression of approach/avoid action tendencies induced by relevant stimuli, while self-reported subjective pleasantness feelings integrate all other emotional components and are plastic. Consequently, emotional responses evoked by odors should be highly differentiated when they are linked to different functions of olfaction (e.g., avoiding environmental hazards). As this differentiation has been observed for contrasted odors (very pleasant or unpleasant), we questioned whether subjective and physiological emotional response indicators could still disentangle subtle affective variations when no clear functional distinction is made (mildly pleasant or unpleasant fragrances). Here, we compared the sensitivity of behavioral and physiological [respiration, skin conductance, facial electromyography (EMG), and heart rate] indicators in differentiating odor-elicited emotions in two situations: when a wide range of odor families was presented (e.g., fruity, animal), covering different functional meanings; or in response to a restricted range of products in one particular family (fragrances). Results show clear differences in physiological indicators to odors that display a wide range of reported pleasantness, but these differences almost entirely vanish when fragrances are used even though their subjective pleasantness still differed. Taken together, these results provide valuable information concerning the ability of classic verbal and psychophysiological measures to investigate subtle differences in emotional reactions to a restricted range of similar olfactory stimuli.
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Affiliation(s)
- Aline M Pichon
- Swiss Center for Affective Sciences, University of Geneva Geneva, Switzerland
| | - Géraldine Coppin
- Swiss Center for Affective Sciences, University of Geneva Geneva, Switzerland ; Emotion, Elicitation and Expression Laboratory, Department of Psychology, Faculté de Psychologie et des Sciences de l'Éducation, University of Geneva Geneva, Switzerland
| | | | | | - David Sander
- Swiss Center for Affective Sciences, University of Geneva Geneva, Switzerland ; Emotion, Elicitation and Expression Laboratory, Department of Psychology, Faculté de Psychologie et des Sciences de l'Éducation, University of Geneva Geneva, Switzerland
| | - Sylvain Delplanque
- Swiss Center for Affective Sciences, University of Geneva Geneva, Switzerland ; Emotion, Elicitation and Expression Laboratory, Department of Psychology, Faculté de Psychologie et des Sciences de l'Éducation, University of Geneva Geneva, Switzerland
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27
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Human amygdala activations during nasal chemoreception. Neuropsychologia 2015; 78:171-94. [PMID: 26459095 DOI: 10.1016/j.neuropsychologia.2015.10.009] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 08/25/2015] [Accepted: 10/06/2015] [Indexed: 02/07/2023]
Abstract
This review serves as a comprehensive discussion of chemosensory stimulation of the amygdala in healthy humans. Following an introduction of the neuroanatomy of chemosensory processing in primary and secondary olfactory structures, functional resonance magnetic imaging and positron imaging tomography studies are systematically categorized based on valence of stimuli, stimulus concentration, and paradigm-dependent amygdala activation. The amygdala shows patterns of lateralization due to stimulus valence. Main findings include pleasant odors being associated with bilateral or left amygdala activation, and unpleasant odors being associated with activation of the right amygdala, suggesting a crucial role of the right amygdala in evolutionary preservation. Potentially threatening social stimuli, however, might be processed apart from the olfactory system and tend to activate the left amygdala. Amygdala response to chemosensory stimuli correlated with simultaneous activation in the orbitofrontal cortex (OFC), piriform cortex (PC), and insula, suggesting a close-knit network of these areas during stimulus processing.
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28
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Lötsch J, Knothe C, Lippmann C, Ultsch A, Hummel T, Walter C. Olfactory drug effects approached from human-derived data. Drug Discov Today 2015; 20:1398-406. [PMID: 26160059 DOI: 10.1016/j.drudis.2015.06.012] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Revised: 06/13/2015] [Accepted: 06/24/2015] [Indexed: 02/04/2023]
Abstract
The complexity of the sense of smell makes adverse olfactory effects of drugs highly likely, which can impact a patient's quality of life. Here, we present a bioinformatics approach that identifies drugs with potential olfactory effects by connecting drug target expression patterns in human olfactory tissue with drug-related information and the underlying molecular drug targets taken from publically available databases. We identified 71 drugs with listed olfactory effects and 147 different targets. Taking the target-based approach further, we found additional drugs with potential olfactory effects, including 152 different substances interacting with genes expressed in the human olfactory bulb. Our proposed bioinformatics approach provides plausible hypotheses about mechanistic drug effects for drug discovery and repurposing and, thus, would be appropriate for use during drug development.
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Affiliation(s)
- Jörn Lötsch
- Institute of Clinical Pharmacology, Goethe University, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany; Fraunhofer Project Group Translational Medicine and Pharmacology (IME-TMP), Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany.
| | - Claudia Knothe
- Institute of Clinical Pharmacology, Goethe University, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Catharina Lippmann
- Fraunhofer Project Group Translational Medicine and Pharmacology (IME-TMP), Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany; DataBionics Research Group, University of Marburg, Hans-Meerwein-Strabe, 35032 Marburg, Germany
| | - Alfred Ultsch
- DataBionics Research Group, University of Marburg, Hans-Meerwein-Strabe, 35032 Marburg, Germany
| | - Thomas Hummel
- Smell & Taste Clinic, Department of Otorhinolaryngology, TU Dresden, Fetscherstrasse 74, 01307 Dresden, Germany
| | - Carmen Walter
- Institute of Clinical Pharmacology, Goethe University, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
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29
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Rozenkrantz L, Zachor D, Heller I, Plotkin A, Weissbrod A, Snitz K, Secundo L, Sobel N. A Mechanistic Link between Olfaction and Autism Spectrum Disorder. Curr Biol 2015; 25:1904-10. [PMID: 26144969 PMCID: PMC4518448 DOI: 10.1016/j.cub.2015.05.048] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2015] [Revised: 04/16/2015] [Accepted: 05/26/2015] [Indexed: 12/27/2022]
Abstract
Internal action models (IAMs) are brain templates for sensory-motor coordination underlying diverse behaviors [1]. An emerging theory suggests that impaired IAMs are a common theme in autism spectrum disorder (ASD) [2–4]. However, whether impaired IAMs occur across sensory systems and how they relate to the major phenotype of ASD, namely impaired social communication [5], remains unclear. Olfaction relies on an IAM known as the sniff response, where sniff magnitude is automatically modulated to account for odor valence [6–12]. To test the failed IAM theory in olfaction, we precisely measured the non-verbal non-task-dependent sniff response concurrent with pleasant and unpleasant odors in 36 children—18 with ASD and 18 matched typically developing (TD) controls. We found that whereas TD children generated a typical adult-like sniff response within 305 ms of odor onset, ASD children had a profoundly altered sniff response, sniffing equally regardless of odor valance. This difference persisted despite equal reported odor perception and allowed for 81% correct ASD classification based on the sniff response alone (binomial, p < 0.001). Moreover, increasingly aberrant sniffing was associated with increasingly severe ASD (r = −0.75, p < 0.001), specifically with social (r = −0.72, p < 0.001), but not motor (r < −0.38, p > 0.18), impairment. These results uncover a novel ASD marker implying a mechanistic link between the underpinnings of olfaction and ASD and directly linking an impaired IAM with impaired social abilities. Olfactory sniffing offers a language and task-free measure of autism and its severity Aberrant sniffing implicates sensory-motor loops at the mechanistic heart of autism Aberrant sniffing links sensory-motor impairments with social impairments in autism
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Affiliation(s)
- Liron Rozenkrantz
- Department of Neurobiology, Weizmann Institute of Science, 234 Herzel Street, Rehovot 76100, Israel.
| | - Ditza Zachor
- The Autism Center and Department of Pediatrics, Assaf Harofeh Medical Center, 1 Road 44, Zerifin 70300, Israel
| | - Iris Heller
- Department of Neurobiology, Weizmann Institute of Science, 234 Herzel Street, Rehovot 76100, Israel
| | - Anton Plotkin
- Department of Neurobiology, Weizmann Institute of Science, 234 Herzel Street, Rehovot 76100, Israel
| | - Aharon Weissbrod
- Department of Neurobiology, Weizmann Institute of Science, 234 Herzel Street, Rehovot 76100, Israel
| | - Kobi Snitz
- Department of Neurobiology, Weizmann Institute of Science, 234 Herzel Street, Rehovot 76100, Israel
| | - Lavi Secundo
- Department of Neurobiology, Weizmann Institute of Science, 234 Herzel Street, Rehovot 76100, Israel
| | - Noam Sobel
- Department of Neurobiology, Weizmann Institute of Science, 234 Herzel Street, Rehovot 76100, Israel.
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30
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Encoding and representation of intranasal CO2 in the mouse olfactory cortex. J Neurosci 2013; 33:13873-81. [PMID: 23966706 DOI: 10.1523/jneurosci.0422-13.2013] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Intranasal trigeminal sensory input, often perceived as a burning, tingling, or stinging sensation, is well known to affect odor perception. While both anatomical and functional imaging data suggest that the influence of trigeminal stimuli on odor information processing may occur within the olfactory cortex, direct electrophysiological evidence for the encoding of trigeminal information at this level of processing is unavailable. Here, in agreement with human functional imaging studies, we found that 26% of neurons in the mouse piriform cortex (PCX) display modulation in firing to carbon dioxide (CO2), an odorless stimulant with known trigeminal capacity. Interestingly, CO2 was represented within the PCX by distinct temporal dynamics, differing from those evoked by odor. Experiments with ascending concentrations of isopentyl acetate, an odorant known to elicit both olfactory and trigeminal sensations, resulted in morphing of the temporal dynamics of stimulus-evoked responses. Whereas low concentrations of odorant evoked responses upon stimulus onset, high concentrations of odorant and/or CO2 often evoked responses structured to stimulus offset. These physiological experiments in mice suggest that PCX neurons possess the capacity to encode for stimulus modality (olfactory vs trigeminal) by differential patterns of firing. These data provide mechanistic insights into the influences of trigeminal information on odor processing and place constraints on models of olfactory-trigeminal sensory integration.
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31
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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: 37] [Impact Index Per Article: 3.4] [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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32
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Barresi M, Ciurleo R, Giacoppo S, Foti Cuzzola V, Celi D, Bramanti P, Marino S. Evaluation of olfactory dysfunction in neurodegenerative diseases. J Neurol Sci 2012; 323:16-24. [PMID: 23010543 DOI: 10.1016/j.jns.2012.08.028] [Citation(s) in RCA: 139] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2012] [Revised: 08/29/2012] [Accepted: 08/30/2012] [Indexed: 11/25/2022]
Abstract
It is known that the olfactory dysfunction is involved in various neurological diseases, such as Parkinson's disease, Alzheimer's disease, multiple sclerosis, Huntington's disease and motor neuron disease. In particular, the ability to identify and discriminate the odors, as well as the odor threshold, can be altered in these disorders. These changes often occur as early manifestation of the pathology and they are not always diagnosed on time. The aim of this review is to summarize the major neurological diseases which are preceded or accompanied by olfactory dysfunction. In addition, new instrumental approaches, such as psychophysical testing, olfactory event-related potentials (OERPs) and functional magnetic resonance imaging (fMRI) measurements, supported by olfactometer for the stimuli delivery, and their combination in evaluation of olfactory function will be discussed. In particular, OERPs and fMRI might to be good candidates to become useful additional tools in clinical protocols for early diagnosis of neurological diseases.
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33
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Morrot G, Bonny JM, Lehallier B, Zanca M. fMRI of human olfaction at the individual level: interindividual variability. J Magn Reson Imaging 2012; 37:92-100. [PMID: 22987333 DOI: 10.1002/jmri.23802] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2011] [Accepted: 08/03/2012] [Indexed: 11/10/2022] Open
Abstract
PURPOSE To determine whether the range of normal variation of human olfactory functional magnetic resonance imaging (fMRI) activations in healthy single subjects is compatible with the detection of atypical patterns. MATERIALS AND METHODS In an event-related olfactory experiment, the variability of fMRI activation in six bilateral olfactory areas known to be affected in neurodegenerative diseases was measured in a region of interest (ROI) analysis in terms of intensity, localization, and overlap on 51 subjects. fMRI measurements were compared against measurements from a visual experiment performed on 25 subjects. RESULTS Olfaction induced activations with low intensity, high variability, and a 4-fold lower contrast-to-noise ratio (CNR) than vision. Even in the best case (piriform cortex), mean pairwise activation overlap was still less than 40%. None of the olfactory ROIs showed significant activation for all subjects at the permissive threshold of P < 0.001. A gender-dependent significantly stronger activation was found in the bilateral piriform cortex of male subjects. CONCLUSION Linking t-statistics and CNR showed that for all olfactory ROIs, CNR is either near or below the estimated threshold of 0.73 found to be necessary to obtain significant activations. In our experimental conditions the low reliability of olfactory activations should prompt major reservations over using fMRI of human olfaction as a diagnostic tool in single subjects.
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Affiliation(s)
- Gil Morrot
- Laboratoire Charles Coulomb, UMR 5221 CNRS and Université Montpellier 2, Montpellier, France.
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34
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Bensafi M, Iannilli E, Poncelet J, Seo HS, Gerber J, Rouby C, Hummel T. Dissociated representations of pleasant and unpleasant olfacto-trigeminal mixtures: an FMRI study. PLoS One 2012; 7:e38358. [PMID: 22701631 PMCID: PMC3373527 DOI: 10.1371/journal.pone.0038358] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Accepted: 05/03/2012] [Indexed: 11/21/2022] Open
Abstract
How the pleasantness of chemosensory stimuli such as odorants or intranasal trigeminal compounds is processed in the human brain has been the focus of considerable recent interest. Yet, so far, only the unimodal form of this hedonic processing has been explored, and not its bimodal form during crossmodal integration of olfactory and trigeminal stimuli. The main purpose of the present study was to investigate this question. To this end, functional magnetic resonance imaging (fMRI) was used in an experiment comparing brain activation related to a pleasant and a relatively unpleasant olfacto-trigeminal mixture, and to their individual components (CO(2) alone, Orange alone, Rose alone). Results revealed first common neural activity patterns in response to both mixtures in a number of regions: notably the superior temporal gyrus and the caudate nucleus. Common activations were also observed in the insula, although the pleasant mixture activated the right insula whereas the unpleasant mixture activated the left insula. However, specific activations were observed in anterior cingulate gyrus and the ventral tegmental area only during the perception of the pleasant mixture. These findings emphasized for the firs time the involvement of the latter structures in processing of pleasantness during crossmodal integration of chemosensory stimuli.
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Affiliation(s)
- Moustafa Bensafi
- Lyon Neuroscience Research Center, CNRS, UMR5292, University Lyon, Lyon, France.
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35
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Djordjevic J, Boyle JA, Jones-Gotman M. Pleasant or Unpleasant: Attentional Modulation of Odor Perception. CHEMOSENS PERCEPT 2012. [DOI: 10.1007/s12078-011-9107-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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36
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Hummel T, Hummel C, Iannilli E, Baur A, Gerber J, Chopra A. Olfactory Processing in Children and Young Adults. CHEMOSENS PERCEPT 2012. [DOI: 10.1007/s12078-011-9114-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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37
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Bensafi M. The Role of the Piriform Cortex in Human Olfactory Perception: Insights from Functional Neuroimaging Studies. CHEMOSENS PERCEPT 2011. [DOI: 10.1007/s12078-011-9110-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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38
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Zelano C, Mohanty A, Gottfried JA. Olfactory predictive codes and stimulus templates in piriform cortex. Neuron 2011; 72:178-87. [PMID: 21982378 DOI: 10.1016/j.neuron.2011.08.010] [Citation(s) in RCA: 115] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/15/2011] [Indexed: 11/29/2022]
Abstract
Neuroscientific models of sensory perception suggest that the brain utilizes predictive codes in advance of a stimulus encounter, enabling organisms to infer forthcoming sensory events. However, it is poorly understood how such mechanisms are implemented in the olfactory system. Combining high-resolution functional magnetic resonance imaging with multivariate (pattern-based) analyses, we examined the spatiotemporal evolution of odor perception in the human brain during an olfactory search task. Ensemble activity patterns in anterior piriform cortex (APC) and orbitofrontal cortex (OFC) reflected the attended odor target both before and after stimulus onset. In contrast, prestimulus ensemble representations of the odor target in posterior piriform cortex (PPC) gave way to poststimulus representations of the odor itself. Critically, the robustness of target-related patterns in PPC predicted subsequent behavioral performance. Our findings directly show that the brain generates predictive templates or "search images" in PPC, with physical correspondence to odor-specific pattern representations, to augment olfactory perception.
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Affiliation(s)
- Christina Zelano
- Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA.
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Lundström JN, Boesveldt S, Albrecht J. Central Processing of the Chemical Senses: an Overview. ACS Chem Neurosci 2011; 2:5-16. [PMID: 21503268 PMCID: PMC3077578 DOI: 10.1021/cn1000843] [Citation(s) in RCA: 150] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2010] [Accepted: 11/04/2010] [Indexed: 11/28/2022] Open
Abstract
Our knowledge regarding the neural processing of the three chemical senses has been lagging behind that of our other senses considerably. It is only during the last 25 years that significant advances have been made in our understanding of where in the human brain odors, tastants, and trigeminal stimuli are processed. Here we provide an overview of the current knowledge of how the human brain processes chemical stimuli based on findings in neuroimaging studies using positron emission tomography and functional magnetic resonance imaging. Additionally, we provide new insights from recent meta-analyses, based on all published neuroimaging studies of the chemical senses, of where the chemical senses converge in the brain.
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Affiliation(s)
- Johan N. Lundström
- Monell Chemical Senses Center, Philadelphia, Pennsylvania, United States
- Department of Psychology, University of Pennsylvania, Pennsylvania, United States
- Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden
| | - Sanne Boesveldt
- Monell Chemical Senses Center, Philadelphia, Pennsylvania, United States
- Division of Human Nutrition, Wageningen University, Wageningen, The Netherlands
| | - Jessica Albrecht
- Monell Chemical Senses Center, Philadelphia, Pennsylvania, United States
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40
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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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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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Wesson DW, Wilson DA. Sniffing out the contributions of the olfactory tubercle to the sense of smell: hedonics, sensory integration, and more? Neurosci Biobehav Rev 2010; 35:655-68. [PMID: 20800615 DOI: 10.1016/j.neubiorev.2010.08.004] [Citation(s) in RCA: 131] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2010] [Revised: 08/17/2010] [Accepted: 08/18/2010] [Indexed: 11/28/2022]
Abstract
Since its designation in 1896 as a putative olfactory structure, the olfactory tubercle has received little attention in terms of elucidating its role in the processing and perception of odors. Instead, research on the olfactory tubercle has mostly focused on its relationship with the reward system. Here we provide a comprehensive review of research on the olfactory tubercle-with an emphasis on the likely role of this region in olfactory processing and its contributions to perception. Further, we propose several testable hypotheses regarding the likely involvement of the olfactory tubercle in both basic (odor detection, discrimination, parallel processing of olfactory information) and higher-order (social odor processing, hedonics, multi-modal integration) functions. Together, the information within this review highlights an understudied yet potentially critical component in central odor processing.
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Affiliation(s)
- Daniel W Wesson
- Emotional Brain Institute, Nathan S. Kline Institute for Psychiatric Research, 140 Old Orangeburg Road, Orangeburg, NY 10962, USA.
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Abstract
The stimulus complexity of naturally occurring odours presents unique challenges for central nervous systems that are aiming to internalize the external olfactory landscape. One mechanism by which the brain encodes perceptual representations of behaviourally relevant smells is through the synthesis of different olfactory inputs into a unified perceptual experience--an odour object. Recent evidence indicates that the identification, categorization and discrimination of olfactory stimuli rely on the formation and modulation of odour objects in the piriform cortex. Convergent findings from human and rodent models suggest that distributed piriform ensemble patterns of olfactory qualities and categories are crucial for maintaining the perceptual constancy of ecologically inconstant stimuli.
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44
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Yeshurun Y, Sobel N. An odor is not worth a thousand words: from multidimensional odors to unidimensional odor objects. Annu Rev Psychol 2010; 61:219-41, C1-5. [PMID: 19958179 DOI: 10.1146/annurev.psych.60.110707.163639] [Citation(s) in RCA: 207] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Olfaction is often referred to as a multidimensional sense. It is multidimensional in that approximately 1000 different receptor types, each tuned to particular odor aspects, together contribute to the olfactory percept. In humans, however, this percept is nearly unidimensional. Humans can detect and discriminate countless odorants, but can identify few by name. The one thing humans can and do invariably say about an odor is whether it is pleasant or not. We argue that this hedonic determination is the key function of olfaction. Thus, the boundaries of an odor object are determined by its pleasantness, which--unlike something material and more like an emotion--remains poorly delineated with words.
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Affiliation(s)
- Yaara Yeshurun
- Department of Neurobiology, The Weizmann Institute of Science, Rehovot, 76100, Israel.
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Lombion S, Comte A, Tatu L, Brand G, Moulin T, Millot JL. Patterns of cerebral activation during olfactory and trigeminal stimulations. Hum Brain Mapp 2009; 30:821-8. [PMID: 18330871 DOI: 10.1002/hbm.20548] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
It is well known that most odorants stimulate both the olfactory system and the trigeminal system. However, the overlap between the brain processes involved in each of these sensorial perceptions is still poorly documented. This study aims to compare fMRI brain activations while smelling two odorants of a similar perceived intensity and pleasantness: phenyl ethyl alcohol (a pure olfactory stimulus) and iso-amyl-acetate (a bimodal olfactory-trigeminal stimulus) in a homogeneous sample of 15 healthy, right-handed female subjects. The analysis deals with the contrasts of brain activation patterns between these two odorant conditions. The results showed a significant recruitment of the right insular cortex, and bilaterally in the cingulate in response to the trigeminal component. These findings are discussed in relation to the characteristics of these odorants compared with those tested in previous studies.
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Affiliation(s)
- Sandrine Lombion
- Laboratoire de Neurosciences Intégratives et Cliniques, 1 Place Leclerc, Université de Franche-Comté, 25030 Besançon Cedex, France
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47
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Bensafi M, Iannilli E, Gerber J, Hummel T. Neural coding of stimulus concentration in the human olfactory and intranasal trigeminal systems. Neuroscience 2008; 154:832-8. [PMID: 18485604 DOI: 10.1016/j.neuroscience.2008.03.079] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2008] [Revised: 03/21/2008] [Accepted: 03/24/2008] [Indexed: 11/16/2022]
Abstract
Nasal chemical sensations are mediated principally by the olfactory and the trigeminal systems. Over the last few years brain structures involved in processing of trigeminal stimuli have been more and more documented. However, the exact role of individual regions in stimulus intensity processing is unclear. The present study set out to examine the neural network involved in encoding stimulus intensity in the trigeminal system and the olfactory system of humans. Participants were presented with two concentrations of relatively specific trigeminal stimuli (CO2) and olfactory (H2S), respectively. Responses were assessed by functional magnetic resonance imaging (fMRI). Whereas brain responses to stimulus intensity in the olfactory modality involved a wide neural network including cerebellum, entorhinal cortex, visual areas, and frontal regions, contrasting high and low CO2 concentrations revealed activation in a less complex network including various sub-regions of the cingulate cortex. Taken together, these results suggest separate but overlapping neural networks involved in encoding stimulus intensity in the two chemosensory systems.
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Affiliation(s)
- M Bensafi
- Université Claude Bernard, Lyon, Laboratoire de Neurosciences Sensorielles, Comportement, Cognition, UMR 5020, Institut Fédératif des Neurosciences de Lyon, IFR19, CNRS, Lyon, France.
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Bensafi M, Sobel N, Khan RM. Hedonic-specific activity in piriform cortex during odor imagery mimics that during odor perception. J Neurophysiol 2007; 98:3254-62. [PMID: 17913994 DOI: 10.1152/jn.00349.2007] [Citation(s) in RCA: 108] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Although it is known that visual imagery is accompanied by activity in visual cortical areas, including primary visual cortex, whether olfactory imagery exists remains controversial. Here we asked whether cue-dependent olfactory imagery was similarly accompanied by activity in olfactory cortex, and in particular whether hedonic-specific patterns of activity evident in olfactory perception would also be present during olfactory imagery. We used functional magnetic resonance imaging to measure activity in subjects who alternated between smelling and imagining pleasant and unpleasant odors. Activity induced by imagining odors mimicked that induced by perceiving real odorants, not only in the particular brain regions activated, but also in its hedonic-specific pattern. For both real and imagined odors, unpleasant stimuli induced greater activity than pleasant stimuli in the left frontal portion of piriform cortex and left insula. These findings combine with findings from other modalities to suggest activation of primary sensory cortical structures during mental imagery of sensory events.
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Affiliation(s)
- Moustafa Bensafi
- Laboratoire Neurosciences Sensorielles, Comportement, et Cognition, Université Claude Bernard Lyon, Lyon Cedex 07, France.
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