Working memory has been suggested to involve two processes with different neuroanatomical locations in the frontal and parietal lobes.[90] First, a selection operation that retrieves the most relevant item, and second an updating operation that changes the focus of attention made upon it. Updating the attentional focus has been found to involve the transient activation in the caudal superior frontal sulcus and posterior parietal cortex. While increasing demands on selection selectively changes activation in the rostral superior frontal sulcus and posterior cingulate/precuneus.[90]

[90]  Bledowski, C., Rahm, B., Rowe, J. B. (October 2009). "What 'works' in working memory? Separate systems for selection and updating of critical information". The Journal of Neuroscience 29 (43): 13735–41. doi:10.1523/JNEUROSCI.2547-09.2009. PMC 2785708. PMID 19864586. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2785708

caudal superior frontal sulcus
posterior parietal cortex
rostral superior frontal sulcus
posterior cingulate/precuneus