> For the complete documentation index, see [llms.txt](https://www.designreference.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/psychology.md).

# Psychology

- [Availability Heuristic](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/psychology/availability-heuristic.md): People overestimate the likelihood of events that are easily recalled from memory.
- [Halo Effect](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/psychology/halo-effect.md): A user's overall positive impression of one feature influences their rating of all other features.
- [Miller's Law](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/psychology/millers-law.md): The average person can only hold seven plus or minus two items in their working memory at once.
- [Paradox of the Active User](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/psychology/paradox-of-the-active-user.md): Users rarely read manuals, preferring to jump in and figure out software immediately.
- [Persuasive Design](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/psychology/persuasive-design.md)
- [Serial Position Effect](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/psychology/serial-position-effect.md): Users are most likely to remember items at the beginning and end of a list.
- [Von Restorff Effect](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/psychology/von-restorff-effect.md): An item that visually stands out from its neighbours is more likely to be remembered.
- [Yerkes-Dodson Law](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/psychology/yerkes-dodson-law.md)
- [Zeigarnik Effect](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/psychology/zeigarnik-effect.md): People remember uncompleted or interrupted tasks better than completed ones.


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