rasing fear memories- key receptor and essential ：imeframe discovered

It is clinically important to suppress or inhibit traumatic memories, which are formed after fearful experiences. In animal models, fear memory is formed by repetitive presentation of a tone paired with an electrical foot-shock. It is well known that an extinction protocol, in which the tone is repeatedly presented without the foot-shock, gradually decreases the preacquired fear response to the tone. However, this fear extinction protocol is not sufficient to erase the fear memory;