emotional way all the morning or chemicals the region releases in the brain things like sour tone and joking me and norepinephrine and the higher the release the stronger the memory of an event. such as an hour in p.t. his first trip together to africa where they had a close call with the lion the. dramatic experiences like this send signals directly from the a mic dela to the hippocampus which appears to act as a kind of gatekeeper for long time memory it also decides what ends up in short term memory like your last order in a restaurant long time memories include things like your first major fight and other critical experiences. nerve cells in the brain still memories when stimulated these neurons fire off chemical neurotransmitters to neighboring brain cells stronger stimuli activate small cell connections memories can never be