Fragrance operates through the olfactory bulb — the only sensory system with a direct neural pathway to the limbic system, the brain region governing emotion and memory. This is why scent triggers emotion faster and more reliably than any other sense.
The HumanSafe Mood Elevation Index (MEI) quantifies this effect across 9 dimensions: confidence, mood lift, warmth, energy, presence, identity, social ease, focus, and sensory pleasure. Each dimension is scored independently and aggregated into a single MEI score from 0 to 10.
Woody and amber fragrance families consistently score highest for warmth and presence. Citrus and green notes lead for energy and mood lift. Understanding these patterns helps consumers choose fragrances that match their emotional goals — not just their aesthetic preferences.