A third advantage in higher-level analysis with FEAT is that it is not necessary for different groups to have the same number of subjects (another aspect to design balancing) for the statistics to be valid, because of the ability to model different variances in different groups. Thus the first Z stat image produced will show response to stimulus type 1, relative to rest, and the second will show the response to stimulus type 2.

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fslmaths fstat2 -div fstat3 fstatb, ftoz -zout zfstata fstata 1 1

All of the EVs have to be independent of each other. Total volumes (including volumes to be deleted) is automatically set from the input files chosen. The Expanded functional image is an image which the low resolution functional data will be registered to, and this in turn will be registered to the main highres image. Cliquez ici pour télécharger la notice explicative et la liste des pièces à fournir. For basis functions which are generally expected to be orthogonal (normally just the Optimal/custom option) this option should normally be left on, otherwise you would normally expect to leave it turned off.
To get the mean: mean = (A+B+C+D)/4 = m+(a+b+c)/4 = contrast [ 1 1/4 1/4 1/4 ]

Le dossier doit-il être traité par les Commissions Locales FSL* ?

This involves interpolation; at the edges of the mask there will be a continuous range of values from 1 down to 0. stats/tstat1 the T statistic image for contrast 1 (=cope/sqrt(varcope)).

Note that cluster p-values are not given for contrasts where post-threshold contrast masking (see below) is applied, as there is not a sensible p-value associated with the new clusters formed after masking.
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EV3 would then be an interaction between EV1 and EV2, with EV1's zeroing set to Centre and EV2's zeroing set to Mean. This option can be used to enter other forms of motion-related regressors, such as ones to remove outliers as created by the script fsl_motion_outliers. Contrast masking: You can setup the masking of contrasts by other contrasts; after thresholding of all contrasts has taken place you can further threshold a given Z statistic image by masking it with non-zeroed voxels from other contrasts. In the case of the unpaired two-group test, set the number of subjects in the first group. Se rapprocher des EDeS du département (Espace départemental des Solidarités), d’un CCAS (Centre Communal d’Action Sociale) ou d’une association d’aide. cope1.feat/filtered_func_data the 4D file that collects the COPEs from the first level analyses, for contrast 1. cope1.feat/var_filtered_func_data the 4D file that collects the VARCOPEs from the first level analyses, for contrast 1. cope1.feat/stats/mean_random_effects_var1 the estimate of the pure between-subjects random effect variance, for contrast 1. cope1.feat/stats/weights1 4D file that is the reciprocal of the sum of of the 1st level VARCOPES and pure between-subjects random effect variance; the square root of this file are the weights used to whiten data and model as part of Generalised Least Squares, for contrast 1. feat - the FEAT script which the GUI calls when the setup has been completed and GO is pressed. C�K��M�\���mKP�%���)� ʺ�t 4��n��Rp{_ωvH-p"��@����. This is because this is still a poorly understood correction method which is under further investigation.

<> La demande FSL se fait directement auprès de votre Conseil Départemental ou auprès de votre CAF .