“This means that someone with depression may not encode positive memories as effectively as an individual without depression, said Nassar, who is affiliated with Brown’s Carney Institute for Brain Science. And when someone with depression looks back on past events, they might remember the negative events better than the positive events, which has the potential to spur a negative feedback loop, he said.”
This is why it is not good to continuously “look back” for answers when you feel depressed, whether on your own or with a therapist. Treat depression in the now with an eye to the future.
This article is a research study about coding memory when something good occurs: https://www.sciencedaily.com/releases/2019/05/190506111426.htm?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+sciencedaily%2Fmind_brain%2Fdepression+%28Depression+News+–+ScienceDaily%29