This video shows how to create a simple experiment using the OpenSesame experiment builder. In this experiment, the participant's task is to judge whether a (picture of a) cat is male or female. Quite tricky, but apparently people can do it after some training.
This video is courtesy of Chris Longmore: chrislongmore.co.uk/screencasts/index.html#opensesame
OpenSesame is freely available from cogsci.nl/software/opensesame
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