Prof. Krystine Batcho, a licensed psychologist and scholar in nostalgia, has developed a universal tool to measure our emotions towards the past using The Nostalgia Inventory Test. It measures how deeply and often people feel nostalgic.

Bored Panda asked the professor about the role our childhood memories play in our lives. “Childhood memories can influence adult lives in a number of ways. They can contribute to our overall sense of happiness in life.” Social experiences we had when little turn out to be crucial. “Positive childhood social events, such as family get-togethers during the holidays or parties to celebrate birthdays or achievements, help establish good self-esteem and healthy social skills in adulthood.”

Prof. Batcho’s life-long research has suggested that “positive childhood memories are associated with more adaptive coping skills in adulthood.” For example, people with happier memories of childhood were less likely to turn to counterproductive ways of dealing with stressful situations, such as substance abuse or escapist behavior. Healthy coping is not something we’re born with, but rather “is learned during childhood by role modeling trusted adults, and memories of how respected adults coped with adversity,” said the professor.

Most of us deeply cherish powerful childhood memories and carry them throughout our lives. Batcho explained that this phenomenon is called a “'rosy retrospection,' that is, a tendency to remember the past as better than it really was.” But there might be an evolutionary reason for it, because “a favorable focus on the past helps most people remain healthy and happy despite the practical and emotional challenges of adult life.”

On the other hand, one's current mood has a tremendous influence on memory retrieval. “When we are sad or depressed, we are more likely to remember negative events in our past and remember past experiences less favorably.” That’s why if you’re in a bad mood, it’s better to leave those blasts from the past for another time in order not to distort them.