Expressive writing can improve working memory capacity. This is the type of memory strongly connected to intelligence:
This study examined the influence of expressive writing on working memory capacity (WMC), a component of executive function. Japanese undergraduates (N = 104) were individually tested across six separate experimental sessions (baseline, three writing, and two follow-up sessions at 1 and 5 weeks). Participants were randomly assigned to write about a traumatic experience, their best possible future selves (BPS), or a trivial topic for 20 minutes. WMC tests were completed at baseline and follow-ups. Results indicate that expressive writing about traumatic experience can improve WMC at 5 weeks after writing, but that writing about BPS or trivial topics has no effect on WMC.
Source: “Working memory capacity can be improved by expressive writing: A randomized experiment in a Japanese sample” from British Journal of Health Psychology, Volume 13, Issue 1, pages 77–80, February 2008
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