We show that duration storage mimics sensory items in working memory (WM): increasing the number of durations in a sequence – but not the duration of the sequence – increases WM load and reduces recall precision. Alpha power during retention indexes WM load, mediating the decrease in precision.

Interesting paper! I think you might be interested in this: www.tandfonline.com/doi/full/10..... Becky Gilbert also looked at EEG correlates in our rhythmic rehearsal probe task in her excellent thesis etheses.whiterose.ac.uk/id/eprint/83...