3. Evaluate changes in neurocognitive function after WBRT with SIB in the following domains: verbal learning and memory as assessed by the Hopkins Verbal Learning Test - Revised (HVLT-R); memory, executive function, and higher order cognition as assessed by the Groton Maze Learning Test; and working memory via either the Two Back Test or One Back Test (depending on patient performance at baseline). All tests except the HVLT-R are part of a custom battery designed with the help of CogState psychology staff and will be delivered via the CogState platform.