Answer:
proactive; retroactive
Step-by-step explanation:
Proactive interference: The term proactive interference refers to the process when an individual's old memories hinder him or her from retaining new memories.
Retroactive interference: The term retroactive interference refers to the process when an individual's new memories hinder him or her from retaining old memories. In other words, the new memories of a person disrupts the old memories.
In the question above, Katie is experiencing proactive interference, whereas Laurel is experiencing retroactive interference.