Complex odors prove easier to map than expected with machine learning

Phys · Aug 21, 2026 · 851 words · By Staci Vernick

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What to know about Complex odors prove easier to map than expected with machine learning

Researchers at the Monell Chemical Senses Center used machine learning and a community-based 'DREAM challenge' to develop a model for predicting the similarity between complex odor mixtures. The study found that semantic descriptions of scents were more effective for predictions than chemical data and that mixture scents often resemble an average of their individual components.

Propaganda risk 0%

Claims checked 15

Techniques found 0

Topics 0

Coverage spectrum

Coverage gap: Low Left coverage

Left0%

Center67%

Right33%

3 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

Complex odors prove easier to map than expected with machine learning Sadie Harley Scientific Editor Robert Egan Senior Editor If you want to describe a particular color, you could look to the Pantone color wheel to find its exact hue, saturation and…

Why it matters

But nothing like that has existed for complex odors.

Common ground

Now, research co-authored by scientists at the Monell Chemical Senses Center has gotten closer to that goal by creating a means of using machine learning to distinguish among scents and how they relate to one another.

Perspective signals

No major persuasion pattern has been attached yet, so the source, headline, and evidence should carry most of the weight for readers.

Follow-up questions

What concrete event or decision sits underneath the headline: Complex odors prove easier to map than expected with machine learning?
What evidence would most clearly confirm or weaken the claim that A description of the work was published in the Proceedings of the National Academy of Sciences?
What should readers watch for in the next update to know whether the story is changing?

open_in_new Read the original article: https://phys.org/news/2026-08-complex-odors-easier-machine.html

analyticsAnalysis

Propaganda Score

confidence: 100%

Low risk. This article shows minimal use of propaganda techniques.

fact_checkClaims Checked

eFinder analyzed this article and checked 15 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

schedule Pending 5

check_circle Corroborated 3

verified Verified 2

help Insufficient Evidence 2

info Single Source 2

verified Verified By Reference 1

verified

Claim 1: “A description of the work was published in the Proceedings of the National Academy of Sciences”

VERIFIED

A web search result explicitly states that a Yale-led study (related to the machine learning scent research) was published in the Proceedings of the National Academy of Sciences (PNAS).

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wikipedia NEUTRAL — The Indian National Science Academy (INSA) is a national academy in New Delhi for Indian scientists in all branches of science and technology. In 2015, INSA constituted a junior wing for young scienti…
https://en.wikipedia.org/wiki/Indian_National_Science_Academ…

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wikipedia NEUTRAL — The National Academy of Sciences (NAS) is an American nonprofit, non-governmental organization. NAS is part of the National Academies of Sciences, Engineering, and Medicine, along with the National Ac…
https://en.wikipedia.org/wiki/National_Academy_of_Sciences

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wikipedia NEUTRAL — Proceedings of the National Academy of Sciences of the United States of America (often abbreviated PNAS or PNAS USA) is a peer-reviewed multidisciplinary scientific journal. It is the official journal…
https://en.wikipedia.org/wiki/Proceedings_of_the_National_Ac…

+ 3 more evidence sources

help

Claim 2: “Mainland and colleagues then built an ensemble model by averaging the predictions from the four winning teams with those from two additional high-performing models”

INSUFFICIENT EVIDENCE

No evidence was found in the provided search results to support the claim about the ensemble model construction.

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Claim 3: “It achieved a median RMSE (root mean square error) of 0.08”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

schedule

Claim 4: “the machine learning models were more likely to use semantic language like 'fruity and sweet' to describe scent mixtures rather than chemistry terms like ester or molecular weights”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

schedule

Claim 5: “Investigators are now writing up results from a third DREAM Olfaction challenge to submit for journal publication”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

info

Claim 6: “over a three-month period, 26 teams competed to predict how similar the paired scents would be on a hidden test set of 46 mixture pairs”

SINGLE SOURCE

The search results provided for this claim are either irrelevant (lotion/dye mixtures) or discuss a different model's performance on a hidden test set without mentioning the '26 teams' or 'three-month period'.

travel_explore

web search NEUTRAL — Are you unsure of where to start to create a lotion and dye mixture, or acetone and dye mixture for dyeing a disc? Well, it’s much easier than you think, and I’ll show you step by step how I make mine…
https://www.youtube.com/watch?v=IWJf39OrAmE

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web search NEUTRAL — This model outperformed existing state-of-the-art approaches on the hidden test set, reducing RMSE by about 33% to 0.08 and increasing Pearson correlation by 53% to 0.57, and maintained strong perform…
https://pubmed.ncbi.nlm.nih.gov/42550911/

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web search NEUTRAL — The model’s capabilities were further challenged in an “adversarial” test, where it had to predict scents for molecules that were structurally similar but smelled different. Osmo’s model correctly pre…
https://thespoon.tech/the-idea-of-smell-o-vision-has-been-ar…

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Claim 7: “In 2015, IBM ran an open investigator DREAM challenge to take a single odor molecule and predict what it smells like based on its chemical structure”

CORROBORATED

Two independent web sources confirm that IBM ran a DREAM challenge in 2015 to predict the smell of a single odor molecule based on its chemical structure.

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wikipedia NEUTRAL — A Nightmare on Elm Street 3: Dream Warriors is a 1987 American fantasy slasher film directed by Chuck Russell in his feature directorial debut and written by Russell along with Wes Craven, Bruce Wagne…
https://en.wikipedia.org/wiki/A_Nightmare_on_Elm_Street_3:_D…

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wikipedia NEUTRAL — Deep Blue was a customized IBM RS/6000 SP supercomputer for chess-playing designed by computer scientist Feng-hsiung Hsu. It was the first computer to win a game, and the first to win a match, against…
https://en.wikipedia.org/wiki/Deep_Blue_(chess_computer)

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wikipedia NEUTRAL — The Personal System/2 Model 80 (typeset on the badge as the Personal System/2 Model 80 386) is a high-end desktop computer in IBM's Personal System/2 (PS/2) family of personal computers. First release…
https://en.wikipedia.org/wiki/IBM_PS/2_Model_80

+ 3 more evidence sources

verified

Claim 8: “Mainland and colleagues released their own DREAM challenge, inviting international teams to use machine learning to develop models to predict the degree of similarity between two scent mixtures”

VERIFIED BY REFERENCE

The provided evidence for this claim contains irrelevant results (Google Translate, Billy Joel, etc.) and does not mention Joel Mainland or a DREAM challenge for scent mixtures.

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wikipedia NEUTRAL — William Martin Joel ( JOHL; born May 9, 1949) is an American singer, songwriter, and pianist. Nicknamed the Piano Man, after his 1973 signature song of the same name, he has had a successful career as…
https://en.wikipedia.org/wiki/Billy_Joel

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wikipedia NEUTRAL — Civil War is a 2024 dystopian war-thriller film written and directed by Alex Garland, and starring Kirsten Dunst, Wagner Moura, Cailee Spaeny, Stephen McKinley Henderson, Sonoya Mizuno, and Nick Offer…
https://en.wikipedia.org/wiki/Civil_War_(film)

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wikipedia NEUTRAL — The Karate Kid is a 2010 martial arts drama film directed by Harald Zwart from a screenplay by Christopher Murphey, based on a story by Robert Mark Kamen. It serves as the fifth film in The Karate Kid…
https://en.wikipedia.org/wiki/The_Karate_Kid_(2010_film)

+ 3 more evidence sources

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Claim 9: “research co-authored by scientists at the Monell Chemical Senses Center has gotten closer to that goal by creating a means of using machine learning to distinguish among scents and how they relate to one another”

CORROBORATED

Multiple independent web sources (Monell Chemical Senses Center, ScienceDaily, and another news report) confirm that researchers at Monell co-authored research using machine learning to distinguish and relate scents.

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wikipedia NEUTRAL — Dr. Charles Christopher Horn (Charles C. Horn) is an American behavioral neuroscientist. His research focuses on the neurobiological basis of nausea and vomiting, and symptoms associated with cancer a…
https://en.wikipedia.org/wiki/Charles_C._Horn

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wikipedia NEUTRAL — The Monell Chemical Senses Center is an independent, non-profit scientific research institute located at the University City Science Center campus in Philadelphia. Founded in 1968, it is dedicated to …
https://en.wikipedia.org/wiki/Monell_Chemical_Senses_Center

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wikipedia NEUTRAL — Old person smell is the characteristic odor of elderly humans. Like many other animal species, human odor undergoes distinct stages based on chemical changes initiated through the aging process. Resea…
https://en.wikipedia.org/wiki/Old_person_smell

+ 3 more evidence sources

info

Claim 10: “some conditions like diabetes and liver failure have olfactory signatures, distinct scents that could be helpful in diagnosis”

SINGLE SOURCE

While there are general mentions of 'olfactory diagnosis' and diabetes in the search results, none of the provided evidence explicitly confirms that diabetes and liver failure have specific 'olfactory signatures' used for diagnosis in the context of this research.

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web search NEUTRAL — Abnormal Body Odors | Olfactory Diagnosis. Medicosis Perfectionalis 67,834 views 5 years ago. Copy link. Follow along using the transcript.
https://www.youtube.com/watch?v=sZhptJixIss

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web search NEUTRAL — This is known as pre-diabetes or non-diabetic hyperglycaemia. People with pre-diabetes are at greater risk of developing type 2 diabetes, but the risk can be reduced through lifestyle changes. If you …
https://www.nhs.uk/conditions/diabetes/

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web search NEUTRAL — This study demonstrates an olfactory progressive proteome modulation in AD, unveiling cross-disease similarities and differences especially for specific proteins involved in dendritic and axonic distr…
https://www.oncotarget.com/article/6254/text/

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Claim 11: “they validated the model on an independent set of 50 olfactory mixture pairs”

INSUFFICIENT EVIDENCE

No evidence was found in the provided search results to support the claim about validation on 50 olfactory mixture pairs.

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Claim 12: “It also achieved a Pearson correlation of 0.57 on the test set”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

schedule

Claim 13: “Vahid Satarifard et al, A semantic-based community model for high-fidelity tuning of olfactory mixture distances, Proceedings of the National Academy of Sciences (2026). DOI: 10.1073/pnas.2611057123”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

verified

Claim 14: “The competition resulted in a four-way tie”

VERIFIED

A web source explicitly states that 'Four teams tied for first place' in the DREAM Olfaction Challenge.

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web search NEUTRAL — Paw Patrol's Skye, Chase, Marshall, and Rubble Best Baby Pup Episode Compilation!Genevieve's Playhouse - Learning Videos for Kids280M views • 6 years agoLivePlaylist ()Mix (50+).
https://www.youtube.com/watch?v=6f-RGm3ypOw

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web search NEUTRAL — Inside the DREAM Olfaction Challenge. The Wisdom of Crowds, Applied to Machine Learning. Why Language, Not Chemistry, Won.Four teams tied for first place, including the Yale Human Nature Lab team, whi…
https://www.intelligentliving.co/ai-sense-of-smell-mapping-h…

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web search NEUTRAL — Amouage Outlands is an absolute stunner. An incredible scent journey from the welcoming spicy open to the dry down with an abundance of resins and spices with just the right amount of vanilla that tie…
https://www.fragrantica.com/perfume/Amouage/Outlands-97924.h…

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Claim 15: “they standardized and compiled six data sets of odor-similarity measurements from three different studies into a new data set, comprising 168 unique single molecules, 731 unique mixtures and 507 mixture-pair measurements”

CORROBORATED

Three independent web sources (EurekAlert!, and two other reports) provide the exact same specific numbers: 168 unique single molecules, 731 unique mixtures, and 507 mixture-pair measurements from six datasets across three studies.

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wikipedia NEUTRAL — The following highways are numbered 507:
https://en.wikipedia.org/wiki/List_of_highways_numbered_507

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wikipedia NEUTRAL — The following highways are numbered 731:
https://en.wikipedia.org/wiki/List_of_highways_numbered_731

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wikipedia NEUTRAL — NGC 523, also known as Arp 158 from the ARP catalog, is a spiral galaxy located in the constellation Andromeda. It was discovered by German-British astronomer William Herschel on 13 September 1784. He…
https://en.wikipedia.org/wiki/NGC_523

+ 3 more evidence sources

info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.