Olfactory Tubercle (OT):

Olfactory tubercle (OT), a multisensory brain structure involved in smell and motivational behaviors — between the olfactory system and dopamine reward pathways — is part of the ventral striatum, with the nucleus accumbens (the brain’s pleasure center). It receives input from the olfactory bulb and transforms odor information into neural codes. The OT may cause odor-guided eating behaviors (how hunger/satiety states affect food intake). It’s also involved in adaptive olfactory learning and natural reinforcement (how odors can act as rewards, even without food or social cues, and addiction). While sources say the OT processes pheromone signals with potential reward value, there’s no confirming evidence in humans.