Hi all,
Thank you very much!
I did 2 runs of each of the stimuli I described in one session (I previously
got some pretty decent maps from these data using the mrVista package from
Stanford).
I followed the retinotopy instructions from the FS wiki (
http://surfer.nmr.mgh.harvard.edu/fswiki/FsFas
w for 6 cycles/scan,
which would improve SNR (and increase total scan duration).
Don
> Date: Thu, 7 Jul 2011 11:30:13 -0400
> From: j...@nmr.mgh.harvard.edu
> To: ahouga...@dadlnet.dk
> CC: freesurfer@nmr.mgh.harvard.edu
> Subject: Re: [Freesurfer] Retinotopy stimuli
>
&
hi anders,
the optimal set of stimulus parameters will depend somewhat on what
cortical area(s) you are trying to map and on the details of your
acquisition. in general, stimulating with both clockwise- and
counterclockwise-rotating wedges for polar angle mapping and with both
expanding and contr
I'd also be very interested to hear about good reinotopic stimuli; we've
used 6Hz and 14 ring sizes for eccentricity mapping in the past.
Thomas Ballinger
On Thu, Jul 7, 2011 at 3:56 AM, Anders Hougaard wrote:
> Dear freesurfers,
>
>
> Which stimuli do you think provide the best retinotopic maps
Dear freesurfers,
Which stimuli do you think provide the best retinotopic maps?
I have done a retinotopy analysis using the following stimuli:
Polar angle:
- 45 deg counter-clockwise rotating wedge
- 8 unique positions
- flickering at 2 Hz
- stimulation period: 36 sec
- no. of cycles: 6
- TR =
