[visionegg] Help on pattern reversal

Hello!
I am using SinGrating2D to build a gabor for a visual perception experiment.

I need the gabor to have a temporal frequency of 6 Hz in a pattern reversal
mode, but the only function, for temporal frequency, I have using SinGrating2D
is drifting. Can you help me with that?
Thank you!
Alessandra

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