Hi Doug,
It seems that, our stimulus presentation is inconsistent with the way
freesurfer processes the retinotopy clockwise and counter clockwise data.
After going through the freesurfer code I found the following.
The freesurfer code assumes that the wedge starts horizontally for both
wow, that's good to know. Sounds like I need to add another hook so that
people can set that parameter.
doug
On 08/13/2012 08:24 AM, Thomas Janssens wrote:
Hi Doug,
It seems that, our stimulus presentation is inconsistent with the way
freesurfer processes the retinotopy clockwise and
I am 100% sure that the stimuli themselves are correct (clockwise and
counterclockwise/ expanding and contracting).
When I look at the individual angle values I noticed that the difference
between the cw and ccw is on average equal to half a cycle (so pi).
When I plot the results (using the
Hi,
I am currently analyzing some retinotopy data.
For the polar angle stimulus we had both clockwise and counterclockwise stimuli.
Both of them started at the top of the screen (12 o'clock), each run includes 4
full cycles and ends with the last wedge slightly before/after 12o'clock.
We have
what is it that is noisy? The angle map or the p-value map? Can you send
pics?
doug
On 08/06/2012 12:41 PM, Thomas Janssens wrote:
Hi,
I am currently analyzing some retinotopy data.
For the polar angle stimulus we had both clockwise and counterclockwise
stimuli.
Both of them started at
I see what you mean. Is it possible that they are the same direction?
When you look at the angle values when running them individually, are
they the same or opposite sign? Are you sure that the par file lists one
as positive and one as negative?
doug
On 08/06/2012 02:56 PM, Thomas Janssens
