The smell of a rose, the aroma of freshly baked bread or the fragrance of a new car -- all are tied to memory. Smells can evoke memories that are so strong they seem real. Why is this? The sense of smell is closely linked to memory because it's one of our most primitive senses and has direct access to parts in our brain that control emotion and long-term memory.
When you inhale an odor, it travels through your nose into tiny receptors called olfactory neurons. These neurons send signals directly from your nose to two areas in your brain: the amygdala (which controls emotions) and hippocampus (which controls long-term memories).
The information then moves on from these areas into other parts of your brain where you process what you've smelled.
Smell also plays an important role in helping us identify things around us by triggering emotional responses based on past experiences with those smells. For example, if someone were wearing cologne or perfume that reminded you strongly about someone else who wore it before, chances are good that when smelling this scent again will trigger feelings associated with those previous experiences -- whether positive or negative.
This phenomenon may be why certain scents can bring back vivid childhood memories for some people while others find them unpleasant enough not wanting them near their homes at all..! In addition, smells have been shown to affect moods as well as physical reactions such as heart rate changes.
Some researchers believe there may even be connections between how we perceive odours and how we react emotionally toward each other based upon body chemistry differences between individuals -- but more research needs done before any conclusions can be drawn about this theory.