Concentric Rings / Radial Sine Grating

[Ian-Max-Andolina]

I have some procedural (like ExpandingRingsDemo) grating shaders that do polar + radial + spiral square or sine gratings that can be animated:

How to create bullseye stimuli in PTB?

Hi all! This is Jiangang. I’m trying to use bullseye stimuli (sine-wave concentric circles with parameters like contrast and spatial frequency, similar to gratings) in my experiment. Just like what is shown in fig. 1 of this study (Dynamic hidden states underlying working-memory-guided behavior | Nature Neuroscience). It has been done with Psychtoolbox but I cannot find how it is done anyhow. Any help would be much appreciated! Jiangang UW-Madison