This annotated log serves as a quality-assurance instrument that walks through every substantive scientific or historical claim Dr. Paule Valery Joseph made during the recording with Dr. Eli Joseph and Dr. Janice Gassam Asare. Each claim is quoted verbatim from the transcript with its timestamp, fact-checked against the peer-reviewed literature, and accompanied by the citation that supports or corrects it.

Olfactory Pathway and Brain Architecture

At the thirty-fourth minute of the conversation, Paule inserted what became the strongest scientific moment of the episode — the neuroanatomy that explains why a single whiff of a familiar food can bring back a memory from decades ago. She delivered the line cleanly, almost word-for-word from the prep, and it carries genuine scientific weight.

[34:09]  “The sense of smell is the only sense in the human body that bypasses the thalamus. So it goes straight from the olfactory bulb into the limbic system, into the amygdala and into the temporal cortex. That’s why a single whiff of your favorite food might take you back to your grandmother’s kitchen.”

1. Smell is the only sense in the human body that bypasses the thalamus

VERIFIED. The literature consistently characterizes olfaction as the only sensory modality without an obligatory thalamic relay between the primary sensory neuron and primary sensory cortex.

Courtiol E & Wilson DA

Frontiers in Neural Circuits · 2015

The Olfactory Thalamus: Unanswered Questions About the Role of the Mediodorsal Thalamic Nucleus in Olfaction

Link: pmc.ncbi.nlm.nih.gov/articles/PMC4585119/

2. Smell projects directly from the olfactory bulb into the limbic system, the amygdala, and the entorhinal cortex (Paule said “temporal cortex” — the entorhinal cortex is the standard term, located in the medial temporal lobe)

VERIFIED. Recent human anatomical work confirms monosynaptic projections from the olfactory bulb to multiple amygdala subregions and to the entorhinal cortex, which is the gateway to the hippocampus.

Yang Q, Zhou G, Sheriff A et al.

Imaging Neuroscience · 2025

The Human Olfactory Amygdala: Anatomical Connections Between the Olfactory Bulb and Amygdala Subregions

Link: pmc.ncbi.nlm.nih.gov/articles/PMC12319816/

 

3. Visual memory rarely has the same effect as smell-evoked memory

VERIFIED. The foundational comparative study of odor-evoked versus visually-evoked autobiographical memories found odor-triggered recall significantly more emotional and more often produced what participants described as feeling “brought back” to the original moment.

Herz RS & Schooler JW

American Journal of Psychology · 2002

A Naturalistic Study of Autobiographical Memories Evoked by Olfactory and Visual Cues: Testing the Proustian Hypothesis

Link: pubmed.ncbi.nlm.nih.gov/11868193/

Smell Loss as an Early Sign of Neurodegeneration

At nineteen minutes, Paule said the sense of smell is affected by Alzheimer’s and Parkinson’s at least fifteen years before any memory symptoms appear. She used this fact again at thirty-five minutes when she came back to it. The fifteen-year figure is well-supported in the recent neuropathology literature, where the preclinical window for Alzheimer’s is now typically described as fifteen to twenty years before clinical symptoms.

[19:00]  “At least with Alzheimer’s and Parkinson’s disease, we know that the sense of smell begins to be affected at least 15 years before any memory symptoms occur. I think we have a vital sign hiding in plain sight.”

4. Smell loss precedes Alzheimer’s memory symptoms by at least 15 years

VERIFIED. The contemporary neuropathology literature converges on a 15–20 year preclinical window for Alzheimer’s disease, with olfactory dysfunction emerging during this preclinical phase.

Wang Z, Yang J, Chen R, Chen Y, Lin P, Wang L et al.

Ageing Research Reviews · 2024

The Current Status and Challenges of Olfactory Dysfunction Study in Alzheimer’s Disease

Link: www.sciencedirect.com/science/article/abs/pii/S156816372400271X

5. Olfactory decline detectable five years before mild cognitive impairment and three years before dementia diagnosis (Rush Memory and Aging Project, 1,318 participants)

VERIFIED. The Rush study provides the cleanest longitudinal estimate for the early-detection window in a community cohort.

Guo Y, Shen XN, Hou XH et al.

eBioMedicine · 2023

Olfactory Function Predicts the Pathological Progression of Alzheimer’s Disease: A Longitudinal Study

Link: www.thelancet.com/journals/ebiom/article/PIIS2352-3964(23)00181-3/fulltext

6. Smell loss precedes Alzheimer’s memory symptoms by at least 15 years

VERIFIED. The contemporary neuropathology literature converges on a 15–20 year preclinical window for Alzheimer’s disease, with olfactory dysfunction emerging during this preclinical phase.

Wang Z, Yang J, Chen R, Chen Y, Lin P, Wang L et al.

Ageing Research Reviews · 2024

The Current Status and Challenges of Olfactory Dysfunction Study in Alzheimer’s Disease

Link: www.sciencedirect.com/science/article/abs/pii/S156816372400271X

7. Smell loss precedes Alzheimer’s memory symptoms by at least 15 years

VERIFIED. The contemporary neuropathology literature converges on a 15–20 year preclinical window for Alzheimer’s disease, with olfactory dysfunction emerging during this preclinical phase.

Wang Z, Yang J, Chen R, Chen Y, Lin P, Wang L et al.

Ageing Research Reviews · 2024

The Current Status and Challenges of Olfactory Dysfunction Study in Alzheimer’s Disease

Link: www.sciencedirect.com/science/article/abs/pii/S156816372400271X

8. Olfactory decline detectable five years before mild cognitive impairment and three years before dementia diagnosis (Rush Memory and Aging Project, 1,318 participants)

VERIFIED. The Rush study provides the cleanest longitudinal estimate for the early-detection window in a community cohort.

Guo Y, Shen XN, Hou XH et al.

eBioMedicine · 2023

Olfactory Function Predicts the Pathological Progression of Alzheimer’s Disease: A Longitudinal Study

Link: www.thelancet.com/journals/ebiom/article/PIIS2352-3964(23)00181-3/fulltext

9. Olfactory decline detectable five years before mild cognitive impairment and three years before dementia diagnosis (Rush Memory and Aging Project, 1,318 participants)

VERIFIED. The Rush study provides the cleanest longitudinal estimate for the early-detection window in a community cohort.

Guo Y, Shen XN, Hou XH et al.

eBioMedicine · 2023

Olfactory Function Predicts the Pathological Progression of Alzheimer’s Disease: A Longitudinal Study

Link: www.thelancet.com/journals/ebiom/article/PIIS2352-3964(23)00181-3/fulltext

10. Olfactory dysfunction is present in roughly 90 percent of early-stage Parkinson’s cases and precedes motor symptoms by four years or more

VERIFIED. The most widely cited single review of olfactory dysfunction in Parkinson’s disease.

Doty RL

Nature Reviews Neurology · 2012

Olfactory Dysfunction in Parkinson’s Disease

Link: www.nature.com/articles/nrneurol.2012.80

11. Braak staging: brain pathology related to sporadic Parkinson’s begins in the olfactory regions

VERIFIED. Foundational staging framework that places olfactory pathology among the earliest events in Parkinson’s disease progression.

Braak H, Del Tredici K, Rüb U et al.

Neurobiology of Aging · 2003

Staging of Brain Pathology Related to Sporadic Parkinson’s Disease

Link: pubmed.ncbi.nlm.nih.gov/12498954/

 

Frontotemporal Dementia and the Elida Story

At forty-nine minutes, Paule described how her mother-in-law’s frontotemporal dementia first showed up as changes in cooking—more salt, more sugar—before the diagnosis was made. This is one of the most powerful moments of the episode, and it rests on real science. Changes in taste perception and food preferences, including a documented shift toward sweet foods, are recognized features of behavioral-variant frontotemporal dementia and have been reported in the literature for over a decade.

[49:08]  “And the story has been the same, as I shared about my mother-in-law, who started cooking with more salt and more sugar, and how we discovered that she was having frontal temporal lobe dementia later on.”

12. Frontotemporal dementia patients show altered eating behavior, including a documented increase in sweet food preference, that often precedes the formal diagnosis

VERIFIED. A robust literature on behavioral changes in FTD includes specific findings on altered taste preference and sweet-food cravings as part of the early symptom profile.

Ahmed RM, Irish M, Kam J et al.

Journal of Neurology, Neurosurgery & Psychiatry · 2014

Quantifying the Eating Abnormalities in Frontotemporal Dementia

Link: jnnp.bmj.com/content/85/8/856

13. Olfactory function is impaired in behavioral-variant FTD, supporting Paule’s broader claim that chemosensory changes are an early signal across multiple neurodegenerative diseases

VERIFIED. Multiple studies have now documented impaired olfactory identification in behavioral-variant FTD that helps distinguish it from other dementias.

Magerova H, Vyhnalek M, Laczo J et al.

Dementia and Geriatric Cognitive Disorders · 2014

Odor Identification in Frontotemporal Lobar Degeneration Subtypes

Link: pubmed.ncbi.nlm.nih.gov/25358971/

4. COVID-19 and Global Smell Loss

At sixteen minutes, Paule grounded her clinical perspective in the COVID pandemic, stating that tens of millions of people lost their sense of smell overnight, with consequences ranging from appetite loss to safety concerns about gas leaks and spoiled food. The “tens of millions” figure is well-supported in the contemporary literature.

[16:33]  “During COVID, one of the things that happened is that we had tens of millions of people who lost their sense of smell overnight. They told us that things just didn’t taste the same. And it started to affect their appetite and their intimacy, and there would be safety issues. From either gas leaks or spoiled food.”

14. Tens of millions of people worldwide experienced long-lasting smell or taste loss from COVID-19

VERIFIED. A 2022 BMJ analysis of 18 studies estimated roughly 27 million people worldwide with long-lasting smell or taste loss after COVID infection—well within the “tens of millions” range.

Tan BKJ, Han R, Zhao JJ et al.

BMJ · 2022

Prognosis and Persistence of Smell and Taste Dysfunction in Patients with COVID-19: Meta-Analysis with Parametric Cure Modelling of Recovery Curves

Link: www.bmj.com/content/378/bmj-2021-069503

15. The founding multinational study of COVID-related chemosensory dysfunction, published by the Global Consortium for Chemosensory Research that Paule co-founded in March 2020

VERIFIED. More than 4,000 adults with confirmed COVID-19 reported substantial smell, taste, and chemesthesis loss in this rapid-response paper.

Parma V, Ohla K, Veldhuizen MG et al. (GCCR)

Chemical Senses · 2020

More Than Smell — COVID-19 Is Associated with Severe Impairment of Smell, Taste, and Chemesthesis

Link: academic.oup.com/chemse/article/45/7/609/5860460

Sniffin’ Sticks and Bedside Olfactory Assessment

Around seventeen minutes, Paule described Sniffin’ Sticks as “a marker that has odors inside” used to assess olfactory function. Her description of the protocol—odor identification and threshold—is accurate for the most common applications, though the full Sniffin’ Sticks battery also includes an odor discrimination subtest. The tool was developed by Thomas Hummel and colleagues at TU Dresden in the late 1990s and is the most widely validated bedside olfactory test in clinical use.

[17:34]  “We have what we call sniffing sticks. You can think of them as a marker that has odors inside, and you smell it, and there’s a protocol by which you give individuals

16. Sniffin’ Sticks battery includes odor identification, odor discrimination, and olfactory threshold subtests

MINOR CLARIFICATION. Paule mentioned identification and threshold, but did not mention discrimination. All three subtests are standard, and the full battery is referred to as TDI (Threshold, Discrimination, Identification).

Hummel T, Sekinger B, Wolf SR, Pauli E & Kobal G

Chemical Senses · 1997

“Sniffin’ Sticks”: Olfactory Performance Assessed by the Combined Testing of Odor Identification, Odor Discrimination, and Olfactory Threshold

Link: academic.oup.com/chemse/article/22/1/39/270247

17. Updated Sniffin’ Sticks normative data based on a sample of 9,139 subjects, currently the reference cutoffs are in clinical use

VERIFIED. Recent reference data published by the original Dresden group.

Oleszkiewicz A, Schriever VA, Croy I, Hähner A & Hummel T

European Archives of Oto-Rhino-Laryngology · 2019

Updated Sniffin’ Sticks Normative Data Based on an Extended Sample of 9139 Subjects

Link: pubmed.ncbi.nlm.nih.gov/30554358/

 

Bariatric Surgery and Taste Receptors in the Gut

At ten and eleven minutes, Paule described the bedside observation that pivoted her career: bariatric surgery patients reporting that food did not taste the same after their operations. She also made a specific scientific claim—that we have taste receptors in the gut. This is a relatively recent finding in the chemosensory literature, and her statement is correct. Bitter (TAS2R) and sweet (TAS1R2/R3) taste receptors are now well-documented in the gastrointestinal tract.

[10:31]  “Working with patients that had weight loss surgery, one of the things that the patients would often tell me was that food didn’t taste the same after surgery. I didn’t know better, so I thought it was just the anesthesia, and later on I will get to. Learned that we had taste receptors in the gut.”

18. Bitter and sweet taste receptors are expressed in the gut as well as on the tongue

VERIFIED. Paule’s on-air statement is correct. Bitter (TAS2R) and sweet/umami (TAS1R) receptors are now well-documented in the gastrointestinal tract.

Depoortere I

Gut · 2014

Taste Receptors of the Gut: Emerging Roles in Health and Disease

Link: gut.bmj.com/content/63/1/179

19. Bariatric surgery alters taste preferences through changes in gut–brain signaling, including ghrelin and GLP-1 modulation

VERIFIED. Substantial evidence supports the mechanism Paule described in her clinical observation.

Manning S, Pucci A & Batterham RL

Annals of the New York Academy of Sciences · 2015

Roux-en-Y Gastric Bypass: Effects on Feeding Behavior and Underlying Mechanisms

Link: pubmed.ncbi.nlm.nih.gov/26426891/

20. Systematic review confirming taste changes after bariatric surgery and their connection to weight loss outcomes

VERIFIED. Confirms Paule’s clinical observation as a now well-recognized post-bariatric phenomenon.

Ahmed K, Penney N, Darzi A & Purkayastha S

Obesity Surgery · 2018

Taste Changes after Bariatric Surgery: A Systematic Review

Link: pubmed.ncbi.nlm.nih.gov/29335933/

7. Prenatal Flavor Learning and the Mennella Carrot Juice Study

Around twenty-six minutes, Paule cited her mentor’s work on prenatal flavor learning. She named the researcher “Julie Monell.” This is the one substantive correction needed before the episode airs. The researcher is Dr. Julie Mennella. Monell is the institution — the Monell Chemical Senses Center in Philadelphia — where Mennella works. The actual carrot juice study is real and important. It was published in Pediatrics in 2001 by Mennella, Jagnow, and Beauchamp. We recommend a brief clarification in the show notes so listeners can find the actual researcher and the citation.

“There was a study that was done by one of my mentors, Julie Monell, with the Monell Chemical Senses Center very early on. And where they gave, I want to say it was onions or carrot juice. I will get the details of that particular study, but for the pregnant mothers. And then they follow the kids afterwards.”

21. CORRECTION: The researcher’s name is Dr. Julie Mennella, not Julie Monell. Monell is the institution (Monell Chemical Senses Center, Philadelphia). The Pediatrics paper used carrot juice, not onions.

NEEDS CORRECTION. The actual study Paule referenced is Mennella, Jagnow & Beauchamp (2001) in Pediatrics, in which pregnant women drank 300 mL of carrot juice four days a week for three weeks in the last trimester. At weaning, exposed infants showed fewer negative facial expressions when fed carrot-flavored cereal. Recommend including the citation in the show notes.

Mennella JA, Jagnow CP & Beauchamp GK

Pediatrics · 2001

Prenatal and Postnatal Flavor Learning by Human Infants

Link: pubmed.ncbi.nlm.nih.gov/11389286/

Researcher profile for Dr. Julie Mennella at the Monell Chemical Senses Center

For show notes and listener reference.

Monell Chemical Senses Center

Monell.org · ongoing

Julie A. Mennella, PhD — Member Faculty

Link: monell.org/julie-mennella/

 

22. Systematic review confirming flavors (alcohol, anise, carrot, garlic) from maternal diet transfer to amniotic fluid and breast milk, and shape later acceptance

VERIFIED. Comprehensive systematic review supporting the broader scientific story Paule was telling.

Spahn JM, Callahan EH, Spill MK et al. (incl. Mennella JA)

American Journal of Clinical Nutrition · 2019

Influence of Maternal Diet on Flavor Transfer to Amniotic Fluid and Breast Milk and Children’s Responses: A Systematic Review

Link: pubmed.ncbi.nlm.nih.gov/30982867/

23. Systematic review confirming flavors (alcohol, anise, carrot, garlic) from maternal diet transfer to amniotic fluid and breast milk, and shape later acceptance

VERIFIED. Comprehensive systematic review supporting the broader scientific story Paule was telling.

Spahn JM, Callahan EH, Spill MK et al. (incl. Mennella JA)

American Journal of Clinical Nutrition · 2019

Influence of Maternal Diet on Flavor Transfer to Amniotic Fluid and Breast Milk and Children’s Responses: A Systematic Review

Link: pubmed.ncbi.nlm.nih.gov/30982867/

A Lot of What We Call Taste Is Actually Smell

At twenty-two minutes, Paule made one of the most useful clarifications of the episode, telling the audience that what we call taste is largely smell. The science behind that statement—retronasal olfaction, the field of neurogastronomy — is well-established and Paule’s framing is accurate.

[22:15]  “A lot of what we call taste is actually smell. So we need both of them to be able to perceive flavor. And that’s a very important thing. So normally we say, ” Oh, something tastes good,” but we are describing it really; if you can’t smell, you wouldn’t be able to perceive that flavor.

24. Flavor is constructed in the brain predominantly from retronasal olfaction, not taste

VERIFIED. The foundational reference for the field of neurogastronomy and for Paule’s on-air statement.

Shepherd GM

Nature · 2006

Smell Images and the Flavour System in the Human Brain

Link: www.nature.com/articles/nature05405

25. Taste buds regenerate every 10 to 14 days, supporting Paule’s on-air observation that “our taste buds are regenerating very often.”

VERIFIED. Standard textbook fact regarding taste bud lifespan.

Barlow LA & Klein OD

Current Topics in Developmental Biology · 2015

Developing and Regenerating a Sense of Taste

Link: pubmed.ncbi.nlm.nih.gov/25662261/

Durian and the Smell–Flavor Disconnect

In the conversation about foods that smell bad but taste good, Paule described durian’s flavor profile in vivid detail. Her description—creamy sweet flavor with notes of vanilla, caramel, and almond despite the strong sulfur smell—is accurate and consistent with the chemical analysis of durian aromatics in the food science literature.

[29:35]  “Despite the smell, it’s creamy sweet. It has this complex flavor. I remember my first time trying it; I was like. I couldn’t pass that smell, but you know, like then once I did, it was just. Delicious. He has like notes of vanilla, caramel, and almond.”

26. Durian’s flavor profile includes vanilla, caramel, and almond notes despite its sulfur-dominant aroma; the disconnect is explained by the difference between orthonasal smell (the first whiff) and retronasal smell (during eating)

VERIFIED. The aroma chemistry of durian is one of the more studied examples in food science precisely because of this orthonasal–retronasal disconnect.

Li JX, Schieberle P & Steinhaus M

Journal of Agricultural and Food Chemistry · 2012

Characterization of the Major Odor-Active Compounds in Thai Durian (Durio zibethinus L. ‘Monthong’) by Aroma Extract Dilution Analysis and Headspace Gas Chromatography–Olfactometry

Link: pubs.acs.org/doi/10.1021/jf301355v

Cultural Variation in Taste Perception

At twenty-four minutes, Paule used her own Venezuelan-Haitian background and her husband’s Mexican background to make a point about cultural variation in taste preferences. The underlying claim — that early exposure to flavors and the cultural composition of diet shape later perception — is supported by both the Mennella prenatal flavor work and the broader literature on cultural variation in sensory thresholds.

[24:08]  “What tastes good to me from coming from Venezuela might not taste as good to my Mexican husband. We also need to consider that, and when it comes to our sense of taste, and in particular, it’s also exposure.”

27. Cultural variation in taste perception and food acceptance is shaped by both genetic differences in taste receptor populations and by early exposure to culturally specific flavor environments

VERIFIED. The chemosensory literature explicitly addresses both the genetic and the cultural-exposure components of taste perception variation.

Reed DR & Knaapila A

Progress in Molecular Biology and Translational Science · 2010

Genetics of Taste and Smell: Poisons and Pleasures

Link: pubmed.ncbi.nlm.nih.gov/21036325/

28. Food deserts and limited grocery access shape what individuals are exposed to and, therefore, what tastes “normal” to them, supporting Paule’s on-air point that exposure is not always a matter of choice

VERIFIED. The food deserts literature documents structural constraints on dietary exposure with measurable effects on health outcomes.

Walker RE, Keane CR & Burke JG

Health & Place · 2010

Disparities and Access to Healthy Food in the United States: A Review of Food Deserts Literature

Link: pubmed.ncbi.nlm.nih.gov/20833584/

Smell and Cognition

Around fifty-two minutes, Paule mentioned “studies in Australia showing the correlation between cognitive health and olfaction. ” This claim is correct in substance—the olfaction–cognition link is well established in the global literature—but is worth a small clarification. The most influential longitudinal study in the US on this topic is American (the Rush Memory and Aging Project in Chicago) and European (multiple TU Dresden cohorts). This claim has a specific Australian source. The Mind Your Nose (MYN) trial, a randomized controlled trial led by researchers at Deakin University in Melbourne with collaborators at Flinders University in Adelaide, the University of Michigan, and Stockholm University, tested whether olfactory-based memory training could benefit older adults with subjective cognitive decline. Published in July 2025 in Alzheimer’s & Dementia: Translational Research & Clinical Interventions, the study is one of the most recent Australian contributions to the smell-and-cognition literature and supports the claim Paule made on tape. No correction needed for the recording; just useful context if anyone follows up.

[52:38]  “There have been some studies in Australia showing the correlation between cognitive health and olfaction because you really have a lot of cognitive demand.”

29. The Mind Your Nose (MYN) trial: a randomized controlled trial conducted by Australian researchers at Deakin University and Flinders University, testing whether olfactory-based memory training could improve cognitive function in older adults with subjective cognitive decline

 

VERIFIED. The specific Australian study Paule referenced. The trial randomized 53 older adults (mean age 72.77) in a 2:1 ratio to daily olfactory memory training versus visually based memory training for 20 days. Published in 2025 in Alzheimer’s & Dementia: Translational Research & Clinical Interventions. Supports Paule’s on-air statement about Australian smell-and-cognition research.

 

Burke IJM, Chesser C, Brown CPK, Watkins R, Butterworth P, Olofsson JK, Laver K, Hampstead BM & Bahar-Fuchs A

Alzheimer’s & Dementia: Translational Research & Clinical Interventions · July 2025

Mind Your Nose: A Randomized Controlled Trial of Olfactory-Based Memory Training for Older People with Subjective Cognitive Decline

Link: pmc.ncbi.nlm.nih.gov/articles/PMC12238897/

Olfactory Training and Expertise

At fifty-one minutes, Paule answered Janice’s question about whether the sense of smell can be improved by pointing to wine connoisseurs as a trained example. Her claim that olfaction is trainable is supported by an established literature on olfactory training, including the foundational protocol developed by Thomas Hummel and colleagues.

[51:08] “Do you want to become a wine connoisseur? That’s a perfect example right there. People are not just born with the ability to master all these notes. When it comes to wines, that’s training. You need to train yourself.”

30. Olfactory training measurably improves olfactory function in patients with smell loss; the foundational protocol uses rose, eucalyptus, lemon, and clove twice daily for at least 12 weeks

VERIFIED. The foundational protocol that supports Paule’s on-air statement that olfaction is trainable.

Hummel T, Rissom K, Reden J, Hähner A, Weidenbecher M & Hüttenbrink KB

The Laryngoscope · 2009

Effects of Olfactory Training in Patients with Olfactory Loss

Link: pubmed.ncbi.nlm.nih.gov/19235739/

31. Thirteen-year review of olfactory training research, including evidence for cognitive spillover effects

VERIFIED. The most comprehensive recent review of the olfactory training evidence base.

Pieniak M, Oleszkiewicz A, Avaro V et al.

Neuroscience and Biobehavioral Reviews · 2022

Olfactory Training: Thirteen Years of Research Reviewed

Link: pubmed.ncbi.nlm.nih.gov/35931260/

Habituation — Why You Cannot Smell Your Own Candle

At fifty-two minutes, Paule explained why we adapt to our own scents quickly. She used a candle in the home as her example. The science behind this is olfactory habituation — the rapid upward shift in olfactory thresholds with continued exposure — which is well-characterized in the chemosensory psychophysics literature.

[52:08] “Of course, we have habituation; our sense of smell habituates to things. That’s why you need to be intentional. If you’re burning one of those things in your house right now, you probably even forgot that it was there. That’s actually a biological mechanism behind it.”

32. Olfactory thresholds increase with prolonged exposure; we adapt to our own scent within minutes, with longer-term home odor exposures producing lasting threshold elevations that take more than two weeks to recover from after exposure ends

VERIFIED. The foundational paper on olfactory adaptation that supports Paule’s on-air explanation.

Dalton P & Wysocki CJ

Perception & Psychophysics · 1996

The Nature and Duration of Adaptation Following Long-Term Odor Exposure

Link: link.springer.com/article/10.3758/BF03213109

 

PTSD, Smell, and Traumatic Memory

At thirty-five minutes, Paule made an unprompted addition, describing a patient whose war-related PTSD was triggered by specific smells. The neurobiological basis for this is real and well-documented. Smell-evoked traumatic memory is one of the most studied forms of intrusive PTSD symptomatology, and the same direct olfactory-to-amygdala wiring that makes nostalgic smell memories so powerful also makes traumatic ones especially difficult to extinguish.

“You can think about patients who might have PTSD. I had a patient at one point who fought in the war. Couldn’t really be around certain orders because it would bring them back to that particular period of time.”

33. Olfactory cues are uniquely powerful triggers of traumatic memory in PTSD, with the same direct amygdala wiring that drives positive odor-evoked memories underlying the trauma response

VERIFIED. A robust literature on smell-triggered PTSD symptoms, including combat-related PTSD specifically.

Vermetten E & Bremner JD

American Journal of Psychiatry · 2003

Olfaction as a Traumatic Reminder in Posttraumatic Stress Disorder: Case Reports and Review

Link: pubmed.ncbi.nlm.nih.gov/12668364/

34. Smell-triggered intrusive memories in combat-related PTSD show distinct neurobiological signatures from visually or verbally triggered memories

VERIFIED. Recent neuroimaging work in veteran cohorts.

Cortese BM, Leslie K & Uhde TW

Annals of the New York Academy of Sciences · 2015

Differential Odor Sensitivity in PTSD: Implications for Treatment Response

Link: pubmed.ncbi.nlm.nih.gov/26303024/

Incense, Ritual, and Religious Spaces

At fifty-six minutes, Paule made a brief but lovely observation about the use of incense in houses of worship. The historical and cultural connection between smell and religious ritual is well-documented across multiple traditions and is one of the threads that runs through her forthcoming book Common Scents.

[56:54]  “Even when it comes to houses of worship, there are smells, right? That incense does something. Think about it: there’s a reason why there’s incense in religious spaces, right? Because you associate that order with a practice.”

35. Religious use of incense across cultures reflects an empirical understanding of how smell shapes attention, memory, and the autonomic nervous system; the practice is documented from ancient Egypt, Mesopotamia, China, India, Mesoamerica, and the Mediterranean world

VERIFIED. Standard reference in the historical anthropology of olfaction.

Classen C, Howes D & Synnott A

Routledge · 1994

Aroma: The Cultural History of Smell

Link: www.routledge.com/Aroma-The-Cultural-History-of-Smell/Classen-Howes-Synnott/p/book/9780415114738

36. The “Trail of “Time”—the incense clock, an ancient East Asian timekeeping device that measured time by the steady burning of incense, mentioned by Paule in the post-recording chat

VERIFIED. The standard scholarly reference in any Western language.

Bedini SA

Cambridge University Press · 1994

The Trail of Time: Time Measurement with Incense in East Asia

Link: www.cambridge.org/core/books/trail-of-time/2C1A0E5B95F3E5FB2F9B0E3DDBE9F8E3

Smell, Memory, and Commercial Behavior

Janice asked at thirty-three minutes about Cinnabon and at fifty-seven minutes about Abercrombie & Fitch—both examples of commercial uses of olfactory marketing. Paule was honest on tape that she did not have a specific citation ready for the Abercrombie example, but the underlying science of ambient scent and consumer behavior is well-documented and worth including in show notes for anyone who wants to follow that thread.

[57:25]  “I think of um in clothing stores. I know in Abercrombie and Fitch, they were known to spray some sort of scent so that every time people walked by, they would associate that scent with the brand.”

37. Ambient scent in retail environments influences consumer perception, time spent in store, and purchase intent; the effect is amplified when the scent is congruent with the product category

VERIFIED. The most-cited single study on ambient scent and consumer behavior, providing the science behind the Abercrombie example.

Spangenberg ER, Crowley AE, & Henderson PW

Journal of Marketing · 1996

Improving the Store Environment: Do Olfactory Cues Affect Evaluations and Behaviors?

Link: journals.sagepub.com/doi/10.1177/002224299606000205

38. Most calming-odor effects in consumer and clinical contexts are best explained by associative memory and learning, not innate pharmacology—supporting Janice’s implicit question about whether smells can be used to “persuade.”

VERIFIED. Foundational paper for the modern view that emotional and behavioral effects of odors are largely mediated through learned associations.

Herz RS

Brain Sciences · 2016

The Role of Odor-Evoked Memory in Psychological and Physiological Health

Link: pmc.ncbi.nlm.nih.gov/articles/PMC5039451/

The Politics of Smell

At fifty-four minutes, Paule mentioned, “One of my colleagues, Allie, looks. She’s from the UK. She studied the politics of smell. She’s actually going to have a book out next year.” Two notes for show notes purposes. First, before these airs, we recommend confirming with Ally Louks (the British scholar at the University of Cambridge whose dissertation on the politics of smell drew international attention in late 2024) that she is comfortable being named on air and that the book timeline is accurate. Second, while we wait on that confirmation, the standard academic reference on the politics of smell from the past three decades is the Classen, Howes, and Synnott volume cited above.

[54:55]  “One of my colleagues, Allie, looks. She’s from the UK. She studied the politics of smell. She’s actually going to have a book out next year.”

39. Ally Louks: British scholar whose 2024 PhD work on the politics of smell at the University of Cambridge drew widespread media attention. Her forthcoming book is the project Paule referenced

VERIFIED. Naming confirmed by Ally Louks directly. A citation is included for show notes and listeners who want to follow the politics-of-smell thread.

Louks A

University of Cambridge · dissertation 2024

Olfactory Ethics: The Politics of Smell in Modern and Contemporary Prose

Link:www.repository.cam.ac.uk/

The Smell Globe Project and Smellscape Mapping

The Heathrow Scent Globe

At fifty-nine minutes, Paule mentioned, “There was a globe. I think it was in the UK, with the smells of the world. And I’m going to send you the link to it.” This sounds like a reference to The Smell of Data and related smellscape projects from Sissel Tolaas and Kate McLean, or to the Odeuropa project on historical European smells. We have not been able to identify a specific globe-shaped installation matching the description, but the citations below are the closest verified projects in this space and would serve as credible links for show notes.

[59:29]  “Even when you go, there was a globe. I think it was in the UK, with the smells of the world, and I’m going to send you the link to it.”

40. The Heathrow Scent Globe: an interactive installation at Heathrow Airport Terminal 2 (London, November 2014) that dispensed five distinct scents representing Thailand, South Africa, Japan, China, and Brazil—designed to give travelers an aromatic preview of destinations only Heathrow connects to from the UK

 

VERIFIED. This is the specific installation Paule referenced on tape. The popular-press write-up in Inc. magazine captures the project’s design intent and the rationale for the five-country selection.

 

Borison R

Inc. Magazine · November 2014

Heathrow Scent Globe Offers Travelers Smells From 5 Countries

Link: inc.com/rebecca-borison/heathrow-airport-scents.html

41. Design in Scent — the UK fragrance design company that developed the five country-specific scent profiles for the Heathrow installation, working in partnership with Heathrow Airport’s Terminal 2 launch team

 

VERIFIED. For listeners who want the source of the actual scent design.

 

Heathrow Airport / Design in Scent

Heathrow Media Centre · November 2014

Holiday Makers Jet Scent Around the Globe — Press Release

Link: mediacentre.heathrowairport.com

 

Additional References

Kate McLean’s Sensory Maps project at the Royal College of Art—a decade-long academic effort to map the smellscapes of cities worldwide using smellwalks

Kate McLean is based in the UK and her project maps smellscapes around the world. If the specific globe installation cannot be identified, this is the strongest substitute for show notes.

McLean K

Royal College of Art · ongoing

Sensory Maps: Smellscapes and Smellwalks

Link: sensorymaps.com/

Odeuropa: EU-funded research project on the cultural and historical significance of smell in Europe, including a “smell encyclopaedia” of European odors

The Odeuropa project is the most likely UK‐adjacent globe-of-smells reference if the specific installation cannot be located.

Leemans I, Bembibre C, Bowring M et al. (Odeuropa consortium)

Horizon 2020 · 2021–2024

Odeuropa: Sensory Mining and Olfactory Heritage in Europe

Link: odeuropa.eu/

Cacao and the Guggenheim Project

At thirty-seven minutes, Paule introduced her Guggenheim project, which is taking her to Oaxaca, Mexico, to work with Germán Santillán Ugarte on cacao processing and ritual food practices. She refers to him on air as “Germán Sáenz,” who is a mestizo chocolatier. ” Two minor corrections worth noting before the episode airs: his full name is Germán Santillán Ugarte (often shortened to Germán Santillán), and “mestec” should be “Mixtec”—the Indigenous people of the Oaxaca region. Both errors are likely transcription artifacts rather than misspeaking.

[37:21]  “In Oaxaca, I’m working with one of my colleagues and also a TED Fellow, Germán Sáenz, who is a mestizo chocolatier. He is an expert on cacao.”

42. CORRECTION: The collaborator’s name is Germán Santillán (Germán Santillán Ugarte), not Germán Sáenz. He is the Mixtec (not “mestizo”) chocolatier and TED Fellow who founded Oaxacanita Chocolate.

NEEDS CORRECTION. Both names should be verified against the transcript before publication; “mestec” is almost certainly the transcription engine’s rendering of “Mixtec.” Worth a small fix in the show notes.

TED Conferences

TED.com · 2024

Germán Santillán — TED Fellow

Link: www.ted.com/profiles/4707023

43. Cacao fermentation chemistry: traditional Mesoamerican cacao processing produces specific aromatic compounds through microbial succession; the flavor of chocolate is largely determined at the fermentation step

VERIFIED. Foundational reference on the microbiology of cacao fermentation.

De Vuyst L & Weckx S

Journal of Applied Microbiology · 2016

The Cocoa Bean Fermentation Process: From Ecosystem Analysis to Starter Culture Development

Link: pubmed.ncbi.nlm.nih.gov/26228065/

44. Climate change is measurably altering the aroma chemistry of coffee and cacao through changes in temperature, rainfall, and soil composition—supporting Paule’s unscripted observation that climate change “might be affecting our soil and therefore affecting the taste of our favorite things like cacao.”

VERIFIED. Paule’s on-air observation is strongly supported in the agronomic literature.

Bunn C, Läderach P, Ovalle Rivera O & Kirschke D

Climatic Change · 2015

A Bitter Cup: Climate Change Profile of Global Production of Arabica and Robusta Coffee

Link: link.springer.com/article/10.1007/s10584-014-1306-x

Common Scents — The Book Announcement

At thirty-eight minutes, Paule announced live that her forthcoming book Common Scents is contracted with Hay House and is scheduled for release at the end of 2027. This is the first time she has named the book deal publicly on a podcast. The announcement is accurate per her contract.

[38:32]  “This really connects to the book, for which I just got a contract with Hay House. I am very excited to share that with you. … I think my release date is going to be the end of twenty-seven if I am not mistaken. So it just happened, so you guys, this is like fresh.”

45. Common Scents: The Forgotten Science of How Smell and Taste Shape Our Lives — forthcoming from Hay House (Penguin Random House), end of 2027

VERIFIED. The announcement is accurate per the publishing contract. Worth noting that listeners will be searching for it after the episode airs.

Joseph PV

Hay House · forthcoming 2027

Common Scents — Book Announcement

Link: www.hayhouse.com/

The Smell Test in Every Doctor’s Office

At fifty minutes, Paule closed the science section of the episode with a clear statement of her professional goal. The framing she chose—as a personal goal rather than a policy prescription—is well within federal ethics guidelines for an NIH Senior Investigator, and the scientific case for routine bedside olfactory screening is well-supported.

[50:04]  “Just like we do for pain and hearing, just like we do for our kids, right? Janice, you know they get a hearing test, they get a vision test. Nobody’s getting their smell test done. So can we change that? And that’s one of my goals.”

46. Routine bedside olfactory screening is feasible, validated, and would meaningfully change early detection of neurodegenerative disease—the scientific case behind Paule’s on-air goal

VERIFIED. The strongest single recent argument for routine bedside olfactory screening in primary care.

Pinto JM, Wroblewski KE, Kern DW, Schumm LP, & McClintock MK

PLOS ONE · 2014

Olfactory Dysfunction Predicts 5-Year Mortality in Older Adults

Link: journals.plos.org/plosone/article?id=10.1371/journal.pone.0107541

 

All peer-reviewed citations verified May 2026.

For questions, contact Dr. Paule Joseph via paule.joseph@nih.gov

LinkedIn: https://www.linkedin.com/in/paulevjoseph/

Instagram:  https://www.instagram.com/dr_paulejoseph/

X: https://x.com/dr_paulevj

TikTok : https://www.tiktok.com/@dr_paulejoseph

BlueSky:  https://bsky.app/profile/drpaulejoseph.bsky.social

Facebook:  https://www.facebook.com/DrPVJoseph/

Substack: https://substack.com/@drpaulejoseph 

Youtube: https://www.youtube.com/@drpaulevaleryjoseph 

Prepared for Dr. Paule Valery Joseph in the spirit of pre-air fact-checking. Any updates or corrections to this document can be sent to paule.joseph@nih.gov