Dear allI am work hard through my data, and the question of setting the right high pass filter is getting on my nerves very recently. I have also been shifting through the different emails in the list to come up with a remedy, but I couldn't. My work is a block design consisting of two conditions A and B, every condition consisting of four different activation blocks (48 seconds each) and four rests (15s each). Should I leave the high pass filter in its default value? or should I change it due to the slightly long nature of my blocks? I recognize that when I changed the default high pass to 400, I had more activations? Are these new activations false positives? How can I make sure?Thanks in advanceBest wishesMohammadPhD of Applied LinguisticsTehran, Iran