Scent and Memory — What the Science Actually Shows
By Kershen Teo, founder and perfumer of Prosody London.
At a Glance — Scent and Memory: What the science shows
Scent and memory are connected through a genuine anatomical shortcut: olfaction is the only sense that reaches the brain’s memory and emotion centres — the amygdala and hippocampus — without first passing through the thalamus, the relay station every other sense must go through. This is well-established neuroanatomy, confirmed by research at UC Irvine and Harvard Medical School, and it’s why scent-triggered memories often feel more vivid and immediate than memories triggered any other way. A small 2023 study explored whether structured nightly exposure to natural oils through a bedside diffuser was associated with improved performance on memory tests in older adults — an interesting early finding that has not yet been replicated, and that says nothing about wearing perfume.
Several botanical compounds found in natural fragrance — linalool, 1,8-cineole, rose oxide — have been studied individually for their interaction with brain regions involved in memory and mood. This research informs which materials we choose; it is not a claim that any Prosody London fragrance affects memory, treats cognitive decline, or should be used as a substitute for medical advice.
Every other sense — sight, sound, touch, taste — routes its signals through the thalamus before reaching the brain’s emotional and memory centres. The thalamus filters and directs sensory information before it reaches conscious awareness. Smell doesn’t work this way. Olfactory signals travel directly to the amygdala and hippocampus — the brain’s emotional and memory architecture — without any thalamic relay.
As Professor Michael Yassa at UC Irvine puts it: “The olfactory sense has the special privilege of being directly connected to the brain’s memory circuits. All the other senses are routed first through the thalamus. Everyone has experienced how powerful aromas are in evoking recollections, even from very long ago.” (UC Irvine News) This is why a scent can transport you to a moment from decades ago with an immediacy that a photograph or song rarely matches.Harvard Medical School neuroscientist Sandeep Robert Datta has described the connection between smell, memory and emotion in similar terms — noting that even though human smell isn’t as acute as a dog’s, “it is deeply tied to our cognitive centers, our emotional centers, and our memory centers.” (Harvard Medicine Magazine) This is independent confirmation of the same underlying mechanism from a separate research institution — solid, well-established neuroscience, and the genuine reason scent and memory feel so intertwined.
I’m Kershen Teo, founder and perfumer of Prosody London. What follows is an honest look at the research connecting scent to memory — including a small, interesting, but limited study that’s often misrepresented online — and the botanical compounds that inform how I formulate.
A Small Study Worth Understanding Properly
In 2023, researchers at UC Irvine published a study in Frontiers in Neuroscience exploring whether nightly exposure to natural essential oils through a bedside diffuser was associated with changes in memory test performance in adults aged 60 to 85. Participants in the enriched group were exposed to seven different natural oils — one per night, for two hours, rotating across the week — over six months. A control group received no scent exposure.
The enriched group showed improved performance on the Rey Auditory Verbal Learning Test compared to the control group, and brain imaging showed measurable differences in the uncinate fasciculus, a pathway connecting memory-related and decision-making brain regions.
This is a genuinely interesting finding. It is also a single study, with 43 participants, that has not yet been independently replicated. It used a structured nightly diffuser protocol under controlled conditions — not perfume worn on skin during the day. It does not establish that wearing fragrance affects memory, and it should not be read as evidence that any fragrance product — including ours — can protect against cognitive decline or any neurological condition. If you have concerns about memory or cognitive health, the right person to speak with is a doctor, not a fragrance article.
What this study does support is something narrower and more useful: that the olfactory system is genuinely connected to memory-related brain regions in a way other senses are not, and that this connection is worth understanding when thinking about how scent and memory relate to each other.
The Botanical Compounds Researchers Have Studied in This Context
Several of the materials used in the UC Irvine study, and several others common in natural perfumery, have been individually studied for their interaction with brain regions and pathways involved in memory and emotional processing. This research is preliminary, mechanism-focused, and conducted largely in laboratory or animal-model settings — it informs which materials I choose to work with, not a claim about what wearing a finished fragrance does to memory.
Rosemary and 1,8-cineole. Research from Northumbria University found that performance on certain cognitive tasks correlated with the concentration of absorbed 1,8-cineole following rosemary aroma exposure. Separate research has examined rosemary extract’s interaction with acetylcholinesterase, an enzyme pathway also relevant to some dementia medications — a mechanistic overlap worth noting as a point of scientific interest, not as a suggestion that rosemary functions similarly to those medications.
Neroli and linalool. Linalool, the primary aromatic compound in neroli, has been studied for its relationship with hippocampal neurogenesis — the process by which new neurons form in a brain region central to memory. This is laboratory-level mechanistic research, not a study of neroli fragrance worn by people.
Rose and emotional encoding. Rose absolute’s interaction with serotonin pathways has been studied in relation to mood; serotonergic activity is also understood to play a role in how emotionally significant experiences are encoded as memory. This is an area of active research interest rather than an established direct effect.
Frankincense and incensole acetate. Research published in the FASEB Journal found that incensole acetate, a compound in Boswellia resin, activates TRPV3 channels in the brain and produces anxiolytic-like effects in animal models. Frankincense has a long history of ceremonial and contemplative use across many cultures — an interesting convergence with modern mechanistic research, though not equivalent to a clinical finding in humans.
Lavender and sleep-related consolidation. Linalool and linalyl acetate, lavender’s primary active compounds, have documented effects on GABA receptor activity, which plays a role in sleep. Since sleep is understood to support memory consolidation generally, lavender’s role in supporting restful sleep is the more defensible and direct connection here — not a separate, independent effect on memory itself.
Bergamot and alertness. Bergamot’s limonene and linalool content has documented cortisol-lowering and mood-related effects. A calm, alert state is generally understood to support concentration and recall better than a stressed one — a reasonable, modest connection rather than a specific memory mechanism.
Why This Research Shapes How I Formulate
None of this is a claim that wearing a Prosody London fragrance affects your memory, protects against cognitive decline, or substitutes for anything a healthcare professional would offer. What it does explain is why certain botanical materials are interesting to work with beyond their scent alone — rosemary, neroli, rose, frankincense, lavender and bergamot all sit at the intersection of genuinely pleasing fragrance materials and compounds that researchers have found interesting reasons to study.
Neroli Nuance is built around neroli and orange blossom absolute. Rose Rondeaux centres on Bulgarian rose absolute. Oud Octavo carries frankincense through its base. Santal Foy is built on sandalwood. Mocha Muscari and Carissis both carry lavender absolute. Lissom Linden opens with bergamot. Each is formulated first and foremost for how it smells and wears — the research above is part of why these particular materials earned their place in the compositions, not a reason to expect any specific cognitive outcome from wearing them.
If you’re interested in trying several of these botanicals to find what genuinely appeals to you, our natural perfume sample set is the best way to do that.
For more on how this same olfactory-limbic pathway relates to stress and mood, read our guides to calming perfume and perfume for mood and happiness.
FAQ
Does scent affect memory?
Scent has a unique anatomical connection to memory. Unlike every other sense, smell reaches the amygdala and hippocampus — the brain’s emotional and memory centres — without passing through the thalamus first. This is well-established neuroscience, confirmed by research at UC Irvine and Harvard Medical School. It explains why scent-triggered memories often feel more vivid than memories triggered by sight or sound. It does not mean that wearing a particular fragrance will improve your memory.
Can perfume improve memory or prevent cognitive decline?
No fragrance, including any Prosody London formula, has been shown to improve memory or prevent cognitive decline. A small 2023 UC Irvine study explored whether structured nightly exposure to natural oils through a bedside diffuser was associated with changes in memory test performance in older adults. The study is genuinely interesting but involved only 43 participants, has not been independently replicated, and used a specific overnight diffuser protocol — not perfume worn on skin. If you have concerns about memory or cognitive health, speak with a healthcare professional.
What is the UC Irvine smell and memory study?
Published in Frontiers in Neuroscience in 2023, the study exposed adults aged 60 to 85 to seven natural oils through a bedside diffuser, one per night for two hours, over six months. The enriched group showed improved performance on a verbal memory test compared to a control group, alongside measurable differences in a brain pathway connecting memory-related regions. It is a single, small, unreplicated study and should be understood as an interesting early finding rather than established fact.
Which botanical compounds have been studied in relation to memory?
Researchers have individually studied compounds including linalool (in neroli and lavender), 1,8-cineole (in rosemary), rose oxide (in rose), incensole acetate (in frankincense), and limonene (in bergamot) for their interaction with brain regions involved in memory and mood. This research is largely mechanism-focused and conducted in laboratory or animal-model settings. It informs which botanical materials are chosen for fragrance composition — it is not evidence that any finished perfume affects memory.
Why does a smell sometimes bring back a very old memory?
This is a genuine and well-documented phenomenon, sometimes called the Proust effect. Because olfactory signals travel directly to the amygdala and hippocampus without passing through the thalamus, scent-triggered memories tend to be more emotionally vivid and reach further back than memories triggered by other senses. This is a normal feature of how the brain processes smell — not something that requires any particular fragrance to occur.
