Answer: Priming
Explanation:
Priming is the mechanism that unconsciously take place in mind while interacting with a stimulus that impacts the response of following stimulus.This response does not occur with certain intention.This method is used for positive mind training as well as negative mind training.
According to the question, Claudia retrieved old memory of her boyfriend from high school as she was reading romantic novel.Therefore novel is the stimulus that caused later stimulus in form of boyfriend's memory to occur in response.So, this scenario is about concept of priming.