i'd like a single mean for each condition, which would be a single mean of 11 numbers, times the number of conditions. so for example, there'd be a single mean for the 1st 11 rows in a column (condition 1), then a separate mean for the next 11 rows in the column (condition 2). each column represents an ROI, so i would repeat this for each column. so if i had 6 conditions, and 3 ROI's, i would end up with 18 means. this would be done for each subject. i would then calculate the SEM (across subjects) for each condition in each ROI. is that more clear?