The answer to this question is "Retroactive Interference", this is directly referring to the process of retaining the old or earlier information due to the acquisition or gaining new information. Thus to this problem, when we are both speaking a Spanish and a French course for a certain period or while enrolled in the subject and as we study further other vocabulary words. Then, we realize that the French words are disrupting the memory of the other vocabulary. This is exactly an example of "Retroactive interference".
