Related to Susan's question, how you would recommend setting the minlag and maxlag for variable stimuli? If the videos vary from 2 TR to 6 TR, what would help to increase the specificity of the sampling of the response? Would it make sense to limit the sampling period to a smaller window -- say from 4-8 sec post-stimulus rather than 2-10 sec (what they currently have)?

Also, since the long stimuli are more like blocks and the short stimuli are more like events, is it acceptable to do two analyses -- one for the long videos using a block design and one for the short videos using an event-related design? Or would that undercut validity since responses to the short and long videos overlap?

Many thanks,
Joan