Attention is the ability to filter out irrelevant noise and focus only on what is currently important. It is typically studied in the context of attending to perception, i.e., directly externally towards the world. However, attention can also be directed internally, towards objects held in visual working memory. This project aimed to investigate this internally-directed attention, and specifically, how this process compared to the typical externally-directed attention. We hypothesised that differences between visual and memory representations in the brain would inevitable cause differenced in how attention would interact with the two. Previous research on external attention suggests that only a single feature can be attended to at a time in perception, but this attended feature can be switched at will, rapidly and effortlessly. This research project found that when internally attending to visual working memory, attention can then be drawn only to a single, primary feature. Accessing other features first required going through the primary feature. In other words, this primary feature acts as an attentional index through which the objects in memory can be subsequently accessed. Furthermore, the choice of the primary feature appears to be under volitional control, likely selected at the time of memory encoding.