It is known that the average person can only hold 7 ± 2 items in their short term memory.

Can this number be increased with training without the use of mnemonics (for example the major system or the method of loci)? What is the consensus of possible improvements of memory span (or digit span) by training?

I only found this paper, whose results

... support that working memory is limited by a fixed number of items.

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    $\begingroup$ Welcome. Does this post answer your question? It seems a dupe question. $\endgroup$ – AliceD Oct 6 '20 at 7:00