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. 2020 Jan 21;7:30. doi: 10.1038/s41597-020-0364-3

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© The Author(s) 2020

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Fig. 1 — Task. (a) In each trial, a set of consonants was presented and had to be memorized. The set size (4, 6 or 8 letters) determined WM workload. The stimulus presentation (encoding period, 2 s) was followed by a delay (maintenance period, 3 s). After the delay, a probe letter was presented, and subjects indicated whether the probe letter was contained in the stimulus.