Memory and Neuroscience

According to Neuroscience, memory (mental retention) is a very complex issue.

We have different types of memory, such as "episodic memory", (recall of personal facts),

 and semantic memory (recall of general facts).

 APA (American Psychological  Association)  Dictionary of Psychology.

And also Hyperthymesia (when people can remember absolutely everything of their life experiences in  detail).

Still in accordance with Neuroscience people who are overloaded with "bad" information are not able to learn because they are not focused on anything that is essential and important.

This is the biggest symptom that the brain of these people have a problem:

 Their ATTENTION to what others (parents, teacher, professor, partners, etc) say is absolute zero.

Their "emotional or affective memory" is also important.

All these have an impact in life of those people who suffer from generalized anxiety disorder, (GAD), depression, mental disorders, etc.
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They become negative, unable to trust, stressed, paranoic, mentally and emotionally unstable and unhappy. etc

Definitely they need a professional attention.

For example: children or any people who were victims of  war and bad people and flee to any safe country as a refugee and when they try to socialize they are totally unable to settle into a new life due to their memory full of  trauma.

Explicit emotional memory manifested when someone "re-experience" the original emotion engendered by an  event.  APA

To sum up, the cognitive skill of our brain to learn is only possible when we pay attention to what is really important.

Not to the memories stuck in the past full of distress and all negative stuffs described above.

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