British neuropsychologist Neil Martin in his book

"The Neuropsychology of Smell and Taste" examines how smells can affect mood and behavior. The hippocampal region of the brain is responsible for memory functions,

Another area that controls the sense of smell is partially connected to the limbic system responsible for emotions, memory and behavior, so when we smell a certain smell, it also triggers certain feelings and emotions.

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For example, if you smell a bad smell in an elevator, you may react with disgust before realizing that the smell may be sweat or fart. Therefore, the sense of smell is the most direct sense that can evoke human instinctive behavior and emotional memory.