[westurner]

- participants all self-selected into the study

They put an ad in a newspaper in San Francisco and then selected for apparent neurotypicality:

ZPE: https://en.wikipedia.org/wiki/Stanford_prison_experiment :

> Participants were recruited from the local community through an advertisement in the newspapers offering $15 per day ($119.41 in 2025) to male students who wanted to participate in a "psychological study of prison life".

Here's that newspaper ad: https://exhibits.stanford.edu/spe/catalog/cj859hr0956 :

> Steady P-Time Job

> [...]

> Male college students needed for psychological study of prison life. $15/day for 1-2 weeks beg Aug. 14. For further information & applications, come to Room 248, Jordan Hall, Stanford U.