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These aren't two competing categories. Functional fragrance is the umbrella — any scent built to do something rather than only smell good. A neuroscent is the part of that umbrella defined specifically by its nervous-system mechanism. Every neuroscent is a functional fragrance; not every functional fragrance is framed as a neuroscent.

Neuroscents and neuroperfumery aren't competing ideas; they're two names for the same science seen from different ends. Neuroperfumery is the practice — the discipline of building fragrance around nervous-system effects. A neuroscent is the output of that practice. One is the craft, the other is the thing it makes.

A neuroscent is a fragrance built to act on your nervous system, not just to smell good. The mechanism is real and specific: scent reaches the limbic system through a pathway that skips the brain's usual processing relay, which is why a scent can shift your state before you've consciously registered it. The term is new; the biology is not.