The association of smells with memories refers to the phenomenon in which a particular scent triggers the conscious or unconscious recollection of a past event, situation, or emotion. This phenomenon is called the "Proust Effect" (or "Proustian memory"), in reference to the writer Marcel Proust, who vividly recalled detailed childhood memories after dipping a madeleine cookie into tea.

Neuropsychological Basis

The olfactory system functions in a unique way compared to other sensory pathways in the brain. Odors send signals directly from the olfactory receptors located at the top of the nasal cavity to the limbic system^【1】 —particularly the amygdala^【2】  and the hippocampus.^【3】 

• The amygdala is involved in emotional processing.
• The hippocampus plays a role in memory formation and retrieval.

This direct neural connection enables odors to be strongly linked with emotionally charged memories.

Cognitive and Emotional Characteristics

Memories triggered by smell are often meaningful, vivid, emotionally intense, and detailed.

Such memories usually originate from early life, particularly childhood, as olfactory memory is long-lasting and less prone to decay over time.

Compared to other stimuli, odors tend to provoke more unexpected and intense emotional responses.

^{An Image Representing the Association of Smells with Memories (Created with Artificial Intelligence)}

Research Findings

Herz and Schooler: Memories triggered by scent were found to be more vivid, older, and emotionally intense than those prompted by visual or verbal stimuli.

Chu and Downes: Participants recalled previously learned information more effectively when aided by scents. When a specific odor was used, individuals experienced emotional states (such as trust, nostalgia, or longing) more intensely.

Clinical and Practical Applications

• Psychotherapy: In conditions like post-traumatic stress disorder (PTSD), scents can act either as triggers or as tools to evoke safe and positive memories.
• Dementia and Alzheimer’s Disease: Even in advanced stages, certain odors can help individuals retrieve old memories.
• Marketing and Brand Psychology: "Scent marketing" uses familiar and pleasant odors to evoke positive past experiences, fostering emotional connections with products or brands.
• Education: Learning sessions accompanied by a specific scent can enhance memory recall when the same scent is present again.

Developmental Perspective

The connection between odors and memory is especially strong during childhood. Research indicates that olfactory-related memories are more intensely encoded between the ages of 0–10 and tend to be more persistent and impactful throughout life compared to other sensory memories. This is primarily due to the high level of plasticity in the limbic system—the brain region responsible for emotions and memory—during childhood. This neuroplasticity allows olfactory stimuli to become deeply embedded at both emotional and mnemonic levels.

Each individual’s emotional and cognitive responses to scents are unique. A smell may evoke comfort in one person while triggering anxiety in another. Thus, scent-memory associations are highly personal and influenced by contextual factors such as environment, personal history, age, and experience.

The association between smells and memories is a powerful example of the interaction between sensory and cognitive systems. This special relationship has broad applications, from psychological support to advertising. The longevity and emotional richness of olfactory memory make it a significant focus in memory research.