I find it interesting to note that while most of these types of studies rely on the smell of plants, the studies do not usually take into consideration that smell is the vehicle--the acting agent could be the plant itself.

Do you think that we would see these types of benefits if we used smells associated with memories, but not connected to the plant world? For example, if one of your parents worked in a car garage, therefore you think of the smell of grease connected to your parent. If you have Alzhemier, would the smell of grease have the same affect as the above to trigger memories? If it does not, and these results are only shown with plant-based smells, then I hope they will also add the plant itself as a subject of the research. What do you think?