To unlearn something is to forget how to do it. Sometimes you might unlearn a skill because you no longer need it.
Storages are places where you can store things. You can use a storage to store your furniture, your clothes, or your toys.
To rehearse is to do something again, to practice it until you are comfortable with it. Sometimes people rehearse for a performance, and other times they rehearse for a test or an interview.
Neurotransmitters are chemicals that are responsible for communication between the different parts of the brain. They are involved in everything from moods to emotions to memory.
Psychologically means in terms of the mind. Sometimes psychologists will use the word to refer to the effects that events have on people's emotions and behavior.