Dr. Rene Hen in Huffington Post

 Studies in mice have shown that suppressing neurogenesis can impair a type of learning called pattern separation, which allows us to distinguish between two similar but slightly different circumstances. One example is remembering where you parked the car from 1 day to the next, explains René Hen, a neuroscientist at Columbia University who was not involved in the new study.
Read more:  http://www.huffingtonpost.com/2014/05/09/brain-memories-research_n_5294841.html