Link without paywall: <a href="https://psyarxiv.com/pvz24" rel="nofollow">https://psyarxiv.com/pvz24</a><p>Previous thread: <a href="https://news.ycombinator.com/item?id=27371309" rel="nofollow">https://news.ycombinator.com/item?id=27371309</a><p>Previous studies:<p>- 2008: <a href="https://doi.org/10.1111/j.1469-8986.2007.00605.x" rel="nofollow">https://doi.org/10.1111/j.1469-8986.2007.00605.x</a><p>- 2016: <a href="https://www.sciencedirect.com/science/article/pii/S0010028516300585" rel="nofollow">https://www.sciencedirect.com/science/article/pii/S001002851...</a><p>- 2020 (large-scale replication study) (could not replicate results): <a href="https://www.researchgate.net/profile/Emil-O-W-Kirkegaard/publication/341609641_Pupil_Size_and_Intelligence_A_Large-Scale_Replication_Study/links/5eca9375a6fdcc90d696db32/Pupil-Size-and-Intelligence-A-Large-Scale-Replication-Study.pdf" rel="nofollow">https://www.researchgate.net/profile/Emil-O-W-Kirkegaard/pub...</a><p>- 2021 (reanalysis of previous studies) (could not replicate results): <a href="http://refhub.elsevier.com/S0010-0277(21)00245-6/rf0045" rel="nofollow">http://refhub.elsevier.com/S0010-0277(21)00245-6/rf0045</a><p>- 2021 (reply to 2021 replication study): <a href="https://englelab.gatech.edu/articles/2021/Tsukahara%20et%20al.%20(2021)%20reply%20to%20Unsworth.pdf" rel="nofollow">https://englelab.gatech.edu/articles/2021/Tsukahara%20et%20a...</a>