Working memory is thought to be comprised of two components:
temporary storage (e.g. short-term memory) and executive
processes [1 ]. Both components contribute to higher cognitive
functions such as comprehension, reasoning, planning, problem
solving, and learning, which are mediated by the prefrontal
cortex (PFC) [2 ]. The dual task paradigm, performance of two
tasks concurrently, is often used to study working memory.
Diminished performance during dual tasks, compared to
performance of separate single tasks, is attributed to the
allocation of limited resources to attend to and perform
competing task requirements. A meta-analysis of neuro-imaging
studies of working memory suggests that tasks of working memory
differ in several ways and may, therefore, produce neural
activity in different cortical regions [4 ]. These include types
of executive function processing (e.g. continuous updating,
temporal order, or manipulation of information) and types of
storage (e.g. spatial, verbal, or object). Several mechanism