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Boot E, Levy A, Gaeta G, Gunasekara N, Parkkinen E, Kontaris E, Jacquot M, Tachtsidis I. fNIRS a novel neuroimaging tool to investigate olfaction, olfactory imagery, and crossmodal interactions: a systematic review. Front Neurosci 2024; 18:1266664. [PMID: 38356646 PMCID: PMC10864673 DOI: 10.3389/fnins.2024.1266664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Accepted: 01/02/2024] [Indexed: 02/16/2024] Open
Abstract
Olfaction is understudied in neuroimaging research compared to other senses, but there is growing evidence of its therapeutic benefits on mood and well-being. Olfactory imagery can provide similar health benefits as olfactory interventions. Harnessing crossmodal visual-olfactory interactions can facilitate olfactory imagery. Understanding and employing these cross-modal interactions between visual and olfactory stimuli could aid in the research and applications of olfaction and olfactory imagery interventions for health and wellbeing. This review examines current knowledge, debates, and research on olfaction, olfactive imagery, and crossmodal visual-olfactory integration. A total of 56 papers, identified using the PRISMA method, were evaluated to identify key brain regions, research themes and methods used to determine the suitability of fNIRS as a tool for studying these topics. The review identified fNIRS-compatible protocols and brain regions within the fNIRS recording depth of approximately 1.5 cm associated with olfactory imagery and crossmodal visual-olfactory integration. Commonly cited regions include the orbitofrontal cortex, inferior frontal gyrus and dorsolateral prefrontal cortex. The findings of this review indicate that fNIRS would be a suitable tool for research into these processes. Additionally, fNIRS suitability for use in naturalistic settings may lead to the development of new research approaches with greater ecological validity compared to existing neuroimaging techniques.
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Affiliation(s)
| | - Andrew Levy
- Metabolight Ltd., London, United Kingdom
- Wellcome Centre for Human Neuroimaging, University College, London, United Kingdom
| | - Giuliano Gaeta
- Health and Well-being Centre of Excellence, Givaudan UK Limited, Ashford, United Kingdom
| | - Natalie Gunasekara
- Department of Medical Physics and Biomedical Engineering, University College London, London, United Kingdom
| | - Emilia Parkkinen
- Health and Well-being Centre of Excellence, Givaudan UK Limited, Ashford, United Kingdom
| | - Emily Kontaris
- Health and Well-being Centre of Excellence, Givaudan UK Limited, Ashford, United Kingdom
| | - Muriel Jacquot
- Health and Well-being Centre of Excellence, Givaudan UK Limited, Ashford, United Kingdom
| | - Ilias Tachtsidis
- Metabolight Ltd., London, United Kingdom
- Department of Medical Physics and Biomedical Engineering, University College London, London, United Kingdom
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Mishor E, Amir D, Weiss T, Honigstein D, Weissbrod A, Livne E, Gorodisky L, Karagach S, Ravia A, Snitz K, Karawani D, Zirler R, Weissgross R, Soroka T, Endevelt-Shapira Y, Agron S, Rozenkrantz L, Reshef N, Furman-Haran E, Breer H, Strotmann J, Uebi T, Ozaki M, Sobel N. Sniffing the human body volatile hexadecanal blocks aggression in men but triggers aggression in women. SCIENCE ADVANCES 2021; 7:eabg1530. [PMID: 34797713 PMCID: PMC8604408 DOI: 10.1126/sciadv.abg1530] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 09/30/2021] [Indexed: 05/29/2023]
Abstract
In terrestrial mammals, body volatiles can effectively trigger or block conspecific aggression. Here, we tested whether hexadecanal (HEX), a human body volatile implicated as a mammalian-wide social chemosignal, affects human aggression. Using validated behavioral paradigms, we observed a marked dissociation: Sniffing HEX blocked aggression in men but triggered aggression in women. Next, using functional brain imaging, we uncovered a pattern of brain activity mirroring behavior: In both men and women, HEX increased activity in the left angular gyrus, an area implicated in perception of social cues. HEX then modulated functional connectivity between the angular gyrus and a brain network implicated in social appraisal (temporal pole) and aggressive execution (amygdala and orbitofrontal cortex) in a sex-dependent manner consistent with behavior: increasing connectivity in men but decreasing connectivity in women. These findings implicate sex-specific social chemosignaling at the mechanistic heart of human aggressive behavior.
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Affiliation(s)
- Eva Mishor
- Azrieli National Center for Brain Imaging and Research, Weizmann Institute of Science, Rehovot, Israel
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Daniel Amir
- Azrieli National Center for Brain Imaging and Research, Weizmann Institute of Science, Rehovot, Israel
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Tali Weiss
- Azrieli National Center for Brain Imaging and Research, Weizmann Institute of Science, Rehovot, Israel
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Danielle Honigstein
- Azrieli National Center for Brain Imaging and Research, Weizmann Institute of Science, Rehovot, Israel
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Aharon Weissbrod
- Azrieli National Center for Brain Imaging and Research, Weizmann Institute of Science, Rehovot, Israel
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Ethan Livne
- Azrieli National Center for Brain Imaging and Research, Weizmann Institute of Science, Rehovot, Israel
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Lior Gorodisky
- Azrieli National Center for Brain Imaging and Research, Weizmann Institute of Science, Rehovot, Israel
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Shiri Karagach
- Azrieli National Center for Brain Imaging and Research, Weizmann Institute of Science, Rehovot, Israel
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Aharon Ravia
- Azrieli National Center for Brain Imaging and Research, Weizmann Institute of Science, Rehovot, Israel
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Kobi Snitz
- Azrieli National Center for Brain Imaging and Research, Weizmann Institute of Science, Rehovot, Israel
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Diyala Karawani
- Azrieli National Center for Brain Imaging and Research, Weizmann Institute of Science, Rehovot, Israel
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Rotem Zirler
- Azrieli National Center for Brain Imaging and Research, Weizmann Institute of Science, Rehovot, Israel
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Reut Weissgross
- Azrieli National Center for Brain Imaging and Research, Weizmann Institute of Science, Rehovot, Israel
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Timna Soroka
- Azrieli National Center for Brain Imaging and Research, Weizmann Institute of Science, Rehovot, Israel
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Yaara Endevelt-Shapira
- Azrieli National Center for Brain Imaging and Research, Weizmann Institute of Science, Rehovot, Israel
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Shani Agron
- Azrieli National Center for Brain Imaging and Research, Weizmann Institute of Science, Rehovot, Israel
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Liron Rozenkrantz
- Azrieli National Center for Brain Imaging and Research, Weizmann Institute of Science, Rehovot, Israel
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Netta Reshef
- Azrieli National Center for Brain Imaging and Research, Weizmann Institute of Science, Rehovot, Israel
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Edna Furman-Haran
- Azrieli National Center for Brain Imaging and Research, Weizmann Institute of Science, Rehovot, Israel
| | - Heinz Breer
- Institute of Physiology, University of Hohenheim, Stuttgart, Germany
| | - Joerg Strotmann
- Institute of Physiology, University of Hohenheim, Stuttgart, Germany
| | - Tatsuya Uebi
- Department of Biology, Graduate School of Science, Kobe University, Kobe, Japan
| | - Mamiko Ozaki
- Department of Biology, Graduate School of Science, Kobe University, Kobe, Japan
| | - Noam Sobel
- Azrieli National Center for Brain Imaging and Research, Weizmann Institute of Science, Rehovot, Israel
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
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