Are there online platforms for running inhibition of return experiments? I want to analyze different cultural groups and an online platform would be the only way to do so.
Yes your experiment is possible. If all you need is the cued and uncued times its easy. Users can run an online applet demo provided by psytoolkit. You can embed the applet in a survey where users can record their times. For more in detail data analysis I recommend that you roll your own based on psytoolkits model. Given how simple the experiment is even starting from scratch should be easy for a computer science undergrad with some experience in .net or another web language.
I've done quite a lot of work on running experiments online over the last while, and have put together some of the code I've found useful in a project tentatively titled PsychScript.
Hope thing helps!
Please see http://statode-demo.herokuapp.com/mental-rotation/ for a demo, it does not require signup.