This is a heavily interactive web application, and JavaScript is required. Simple HTML interfaces are possible, but that is not what this is.
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PsyToolkit
psytoolkit.org
did:plc:tffh3onwtv734t54o6uhi7ou
The numerical Stroop effect is really cool. It was invented in 1979 and there are many follow up studies including detailed response time analyses, such as by Kristen Bowman @drkbow.bsky.social (who told me about the task). Here you can find a PsyToolkit version
https://www.psytoolkit.org/experiment-library/numerical_stroop.html
2025-02-16T12:55:23.455Z