Reply-To: | | [log in to unmask][log in to unmask]> wrote: > Dear SPMers, > > I would like to have some comments about the size of Gausian kernel for > spatial smoothing. > I have collected 128x128 EPI images with a 32 channels head coil. > The original voxel size is 1.72x1.72 x 3.8. > For spatial normalizing, I resampled data by 2x2x2 voxel size. Then I > applied Gausian smoothing by 8x8x8 kernel and compared it with 6x6x6 kernel. > In results, the data smoothed by the bigger kernel show more activation in > general. However, with 6x6x6 kernel, there are some distinct activation > spots additionally. > So, I am suspecting a chance that the smoothing with a larger kernel may > reduce sensitivity of regional differences. I haven't run a group level > analysis yet but I am also considering it may affect the group level > analysis. The bigger kernel may compensate individual anatomical > difference. > > Any comment will be very helpful. > > Thanks, > > Donghoon > > -- > ============================= > Donghoon Lee > > Ph.D Candidate > Department of Psychological and Brain Sciences > Indiana University > 1101 East Tenth St. > Bloomington, IN 47405 > Phone(O): 1-812-856-1776 > E-mail:[log in to unmask] > > I prefer keeping in mind even the possibility that existence has its own > reason for being. > - Wislawa Szymborska > ============================= > >37_4Jun200912:58:[log in to unmask] |