hi lars,
the FSFast retinotopy analysis stream is geared towards temporal phase encoded data analysis, which produces field sign maps that can be used to define area boundaries.
if you opt to use stationary wedge stimuli to activate the horizontal and vertical meridian representations in visual cortex rather than the traditional phase encoding stimulus paradigm, since the vertical and horizontal meridian representations also lie along area boundaries, you can identify them in your data through a standard block design paradigm analysis. this is straightforward but outside the retinotopy stream. instead you can use 'mkanalysis-sess' and 'selxavg3-sess' as described on the fswiki.
of course it is possible to interpret your periodic stimulus as temporally phase encoded and run the usual frequency analysis (i.e., 'sfa-sess'), but i think that the block design analysis is more appropriate for your data.
hope this helps!
-jon
On Tue, 26 Jun 2007, Lars Kuchinke wrote:
Hi all,
I used a retinotopy paradigm with two horizontal and vertical wedges located at the meridians (flickering at 8Hz, switching every 20 seconds)
do you think that this paradigm does fit into fsfastretinotopy analysis? I'm not sure if it makes a difference compared to rotating edges... Any suggestions?
Thanks, Lars