Which factor can contribute to difficulties in memory retrieval?

The correct answer focuses on interference from newly learned information, which is a well-documented phenomenon in cognitive psychology. This concept is referred to as retroactive interference, where new information interferes with the ability to retrieve previously learned material. Essentially, when an individual learns something new, it can overshadow or disrupt the memory retrieval process for earlier learned information, making it harder to access those older memories. This is particularly relevant in situations where the old and new information are similar or related, leading to confusion or difficulty in recalling the original material.

In contrast, factors such as sufficient sleep and nutrition are generally known to support memory function rather than hinder it. Excessive reliance on one sense for memory might affect the richness of the memory recall but does not inherently prevent retrieval. Consistent practice of recall is a method that enhances memory retrieval, reinforcing neural pathways associated with the memories and making it easier to access information over time. Thus, of all the options provided, interference from newly learned information is the primary factor that can create challenges in retrieving existing memories.