Using mice, researchers have discovered how traumatic memories can be locked away in the brain, and how to go about finding and then unlocking these hidden memories. Fear-inducing memories can be hidden or made consciously inaccessible. However, these suppressed memories can create many problems, such as PTSD, anxiety, and depression. The researchers found that suppressed memories formed in a certain state of mind, such as a particular mood or drug-induced state, are best retrieved when the brain is back in that state of mind. Soldiers that have been to combat are especially at risk for suppressing memories and developing PTSD. This research is directly benefiting them because it will lead to new treatments and help those that need to access their memories in order to recover.