We've all had the experience of studying hard for a test, believing we know the information, and then sitting down in the testing room only to draw a blank. Why does that happen?
In this TED-Ed video, Elizabeth Cox explains there are many kinds of stress and many kinds of memory, but short term stress can affect a person's ability to recall facts. There are three basic steps to learning new information: acquisition, consolidation and retrieval. Moderate stress related to the memory task itself can actually have a positive affect on the acquisition and consolidation phases. The brain releases corticosteriods when stressed, which prompt the amygdala to tell the hippocampus to consolidate a memory. The stress signals to the brain that the information is worth remembering, but other emotions can be equally helpful to encode memories.