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Neuroscience study links childhood scent memories to early-life neurons

olfactory memory childhood scents neuroscience granule cells emotional memory

A study published in PLOS Biology by Jules Dejou and colleagues has identified the neurological basis for how childhood scents become linked to positive emotions. Research indicates that neurons developing shortly after birth in the olfactory bulb's granule-cell layer are responsible for encoding memories of scents associated with joy.

To investigate this, researchers conducted a survey of 647 adults, who overwhelmingly identified childhood scents tied to happiness. The team then used juvenile mice to trace the biological mechanism. Mice exposed to attractive odors within an enriched, playful environment showed a stronger preference for those scents in adulthood compared to mice in standard housing.

The findings suggest that the olfactory system's direct connections to brain regions like the amygdala and hippocampus allow early sensory experiences to form long-lasting emotional signatures. While these preferences may decrease as neonatal cells are deactivated or as the animals age, the memories can persist through broader neural networks.

Entities

Jules Dejou · PLOS Biology

Sources

Wie Kindheitsgerüche mit Freude verknüpft werden: Befunde zu frühen Neuronen [www.it-boltwise.de]
Asked to recall their earliest scent memory, 647 adults overwhelmingly named smells tied to happiness, encountered again and again in childhood — a mouse study then traced where a memory like that first takes hold in the brain [www.psypost.org]