During the last decade neuroscientists have shown an increasing interest in adult neurogenesis and a number of studies have been focused on the role that it could play in learning and memory processes. One of the brain structures that generates new neurons along adulthood is the Dentate Gyrus of the hippocampus. This structure is involved in learning and memory processes, and a plausible role for these newly born cells at the information processing level has been suggested. Nevertheless, actual evidences do not provide a clear picture on the type of cognitive processes supported by adultborn neurons. The present work reviews the last evidences related to the possible role of neurogenesis in learning and memory mechanisms.