How would interference from a simultaneous visual task affect a verbal working memory task?

• A. It would not affect the task at all.
• B. A concurrent visual task can disrupt the visuospatial sketchpad; if the verbal task relies heavily on the central executive, there may be some interference, but verbal tasks mainly tap the phonological loop.
• C. It would completely disrupt the phonological loop regardless of the task.
• D. It would enhance phonological loop efficiency due to cross-modal facilitation.

Answer: (B)

When we hold and manipulate information in working memory, different components handle different types of content and control how we allocate attention. A verbal task mainly relies on the phonological loop to store and rehearse spoken information. A visual task, on the other hand, uses the visuospatial sketchpad to hold and transform visual and spatial information. The central executive coordinates attention and helps manage how we split resources between tasks.

If a person is doing a verbal task while a visual task is also being performed, the visual task primarily taps the visuospatial sketchpad, which can interfere with tasks that rely on that subsystem. If the verbal task also needs substantial central-executive involvement—for example, if it requires manipulating or updating information rather than simple rehearsal—there can be additional interference because the central executive has to split its attention between both activities. However, for many verbal tasks that rely mainly on the phonological loop, the disruption is not complete; the phonological loop can still maintain verbal information, albeit with some cost if the central executive is heavily engaged.

So, a concurrent visual task can disrupt the visuospatial sketchpad, and there may be some interference with the central executive if the verbal task requires substantial manipulation, but verbal tasks mainly tap the phonological loop.