Answer:
Proactive interference
Explanation:
Interference is simply the explaination one gives for forgetting long term memory. It occurs when a similar information gets in the way of an information one wants to recall or remember.
It is of two types, Proactive and retroactive.
Retroactive is when a much newer information prevents you from recalling a much older information.
Proactive is when an old information gets in the way of recalling a new information.
People who find it difficult to learn new materials due to interference effect from old materials learned are simply suffering from proactive interference.