“We believe that the brain takes advantage of hormones and chemicals, released during stressful and powerful emotions, to regulate the strength of memory. We owe our very lives to this; a dangerous...

“We believe that the brain takes advantage of hormones and chemicals, released during stressful and powerful emotions, to regulate the strength of memory. We owe our very lives to this; a dangerous event needs to be recalled” is a quote from the article “Its magic, its malleable its memory!”. Why does a dangerous event need to be recalled? And would evolution make it so that a child too young to have independent memory would be able to remember a particular event that was particularly exciting or traumatic?