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. 2021 Feb 22;8(2):e23712. doi: 10.2196/23712

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©Beau Gamble, Katherine Depa, Emily A Holmes, Marie Kanstrup. Originally published in JMIR Mental Health (http://mental.jmir.org), 22.02.2021.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Mental Health, is properly cited. The complete bibliographic information, a link to the original publication on http://mental.jmir.org/, as well as this copyright and license information must be included.

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Screenshots from the “How to Play Tetris” video, which instructs participants on how to complete the imagery-competing task in the specific way required (eg, by emphasizing "mental rotation").