Hello,
          The highpass filter is applied first ( if enabled ) and then the low-pass filter is applied ( if enabled ).

Hope this helps,
Kind Regards
Matthew

On 1 Feb 2016, at 14:42, Jeffrey Spielberg wrote:

> Hi all,
>
> Two questions regarding FSL's temporal filtering (e.g., fslmaths -bptf).  First, how are timepoints beyond the boundary handled (e.g., mirror-reflection)?
>
> Second, according to past listserve messages, highpass filtering is accomplished by (lowpass) gaussian filtering the data with the 'HP' sigma (leaving low frequency data), then subtracting that low frequency data from the full data.  This suggests that, for bandpass filtering, low and highpass filtering are not done simultaneously, is that correct?  If so, what order are low and highpass done or are they independent?  In other words, is highpass filtering done, then lowpass filtering on the resultant data?  Or the reverse?  Or are low frequency data (for highpass filtering) computed using the original data and that is subtracted from the already lowpassed data (i.e., they are independent)?
>
> Best,
> Jeff