This was the largest trial of SSIs, and the first ever megastudy of mental health interventions. Thanks to leadership from @protzko.bsky.social, @lluaces.bsky.social, @matnoc.bsky.social, @stephenschueller.bsky.social, and @jschleiderphd.bsky.social, and all 50 teams who submitted SSIs!

The most successful SSIs’ content and styles varied a lot, but broadly, they provided focused, engaging, and actionable guidance on a skill that was important to users.

We think future work should aim to leverage SSIs’ short-term gains toward more sustained behavior change or service engagement.

We randomized 7,505 American adults experiencing depression to one of the 12 SSIs or a control.

Nearly all SSIs boosted agency and hope for improvement immediately (Cohen's ds ≤ 0.37). However, only two significantly reduced depression four weeks later (ds = 0.14 and 0.15).

Digital single-session interventions (SSIs) have been shown to improve depression, with small effects and in limited settings. We wanted explore ways to make them better.

To learn which kinds of SSIs work and which don’t, we crowdsourced 66 diverse SSIs from global teams and chose 12 for testing.

Thanks to my terrific co-authors, @arkaghosh024.bsky.social, @carterfunkhouser.bsky.social, @stephenschueller.bsky.social, and @jschleiderphd.bsky.social

And shout out to @psychscience.bsky.social for being leaders on open science.

Non-paywalled version of the paper here: osf.io/preprints/os...

Lincoln park Zoo, Ohio St beach or Oak st Beach, the Field Museum, and the giant faces that spit out water next to the bean!