Hi,
if the subjects >sees< a cue and has to attend to it to get the on and
off, you expect visual activations, don't you?
From what I can see there is also left M1 activation. Was the ball put
into the right hand?
Cheers,
Andreas
Am 17.06.13 12:45 schrieb "Louis Shue" unter <[log in to unmask]>:
>Dear FSL experts,
>
>We are currently using FEAT (so far only first level analysis) to analyse
>some fMRI recordings as a part of study on stroke rehabilitation. The
>experimental protocol seems "conventional" enough from what I can gather
>from literature.
>
>The subject (both controls and stroke patients) sees a prompt at set
>intervals. When it's 'on', in our case the subject squeezes and releases
>a pressure ball continuously, using the same hand for a given recording
>session). When it's 'off' the subject relaxes. There are 5 'on' cycles in
>each session.
>
>However, the results from FEAT show very strong activations in the visual
>cortex region, instead in the motor cortex!? I am not sure if we are
>doing anything wrong here, but can someone suggest how we may
>isolate/enhance the desired effects somehow?
>
>I have included the raw data and the model file - in 3 column format - if
>anyone wants to take a look. In the model file, it's initially in the
>'off' state, all measures in seconds.
>
>Any advice is greatly appreciated!
>
>data (for a control subject, performing the required action using the
>right hand) :
>
>https://dl.dropboxusercontent.com/u/8460189/Cn001_20110902_CIRC_Irvin_007_
>ep2d_bold_3.nii.gz
>https://dl.dropboxusercontent.com/u/8460189/bold3_active_right.txt
>
>(part of) FEAT output:
>
>https://dl.dropboxusercontent.com/u/8460189/rendered_thresh_zstat1.png
>https://dl.dropboxusercontent.com/u/8460189/tsplot_zstat1.png
>
>TR=3, High pass cutoff=100, BET brain extraction checked.
>
>Cheers,
>Louis.
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