Final answer:
The superior memory for pictures over words is explained by the dual coding theory, which asserts that pictures benefit from both visual and verbal encoding, leading to stronger memory traces. This is amplified by semantic encoding of meaning and the organization of knowledge into semantic networks in the brain.
Step-by-step explanation:
The concept that explains why memory for pictures is often better than memory for words is referred to as dual coding theory. According to this theory, pictures are stored in memory as both image codes and verbal codes. Images are encoded through both visual encoding and semantic encoding, whereas words are typically encoded in just one form. People tend to recall concrete, high-imagery words that can be easily pictured better than abstract, low-imagery words that do not readily bring to mind a specific image.
Semantic encoding, which involves processing the meaning of words, allows for a deeper level of processing and leads to stronger memory trace. Furthermore, semantic networks in our brain help us in organizing knowledge and concepts, making the information more accessible and thereby enhancing memory retention. Hence, the advantage of picture memory can be attributed to the ability of the human brain to process and store images in multiple ways, enhancing the likelihood of retrieval.