How could a researcher distinguish between Phonological Loop and Visuospatial Sketchpad involvement in a memory task?

• A. Using only verbal tasks.
• B. Using only visual tasks.
• C. Ignoring interference.
• D. By selecting modality-specific tasks (verbal sequences for PL; visual-spatial sequences for VSSP) and using manipulation like articulatory suppression or secondary tasks to create interference.

Answer: (D)

The main idea being tested is how to separate the functioning of the phonological loop from the visuospatial sketchpad by using tasks that specifically target each system and by introducing interference that selectively disrupts one system. The phonological loop handles verbal information and relies on subvocal rehearsal; articulatory suppression—repeating a simple sound or word—tieing up the rehearsal process, makes it harder to maintain verbal sequences, showing its role when verbal material is recalled. The visuospatial sketchpad, on the other hand, processes visual and spatial information; giving a secondary visual-spatial task or tracking task competes for its resources and impairs memory for visual-spatial sequences.

By choosing verbal sequences and visual-spatial sequences as tasks, you can see which system each task relies on. If articulatory suppression disproportionately reduces recall for verbal sequences but not for visual-spatial ones, that points to the phonological loop being involved. If a visuospatial interference task reduces recall for visual-spatial sequences more than verbal sequences, that implicates the visuospatial sketchpad. This pattern of selective interference is what allows researchers to distinguish the two components.

Using only verbal tasks or only visual tasks wouldn’t clearly separate the systems, and ignoring interference wouldn’t reveal how the subsystems interact.