I am wondering if anyone has ever encountered problems with subjects getting headaches after using the Iscan head-mounted eye tracker for more than 45 minutes (or any other problems with experiments of this length). If so, do you have any suggestions on how to address such a problem, or an idea of what the time limit for the use of this kind of equipment is? thank you Jason Varvoutis -- EYE-MOVEMENT mailing list ([log in to unmask]) N.B. Replies are sent to the list, not the sender To unsubscribe, etc. see http://www.jiscmail.ac.uk/files/eye-movement/introduction.html Other queries to list owner at [log in to unmask]