Do you ever walk into the kitchen when your mom is baking a tasty treat and then BAM! you have an emotion come back to you from a memory you had with that treat. Why does this happen? Many of our likes and dislikes of taste and smell is due to the association of emotion. Smell receptors relay to the cortex which is the main cognitive recognition area of the brain and the olfactory receptors connect to the limbic system (emotion control area). So its no wonder that we have emotions and memories when we taste or smell. Here is a link describing how closely related the olfactory and glutamate systems are. Check it out!
http://www.youtube.com/watch?v=WavjbJhiRAE
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