[visionegg] square wave gratings

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Mark Tovey wrote:

A thought: is there a way to set the parameters for the sine gratings such
as to produce a simple black and white grating? (ie. black for 6 pixels,
white for six pixels, black for 6 pixels, white for six pixels, etc.)

Yes. When contrast = 1.0, the Vision Egg uses the maximum luminance range possible without clipping. With contrast > 1.0, it starts clipping. Therefore, if you set contrast much, much greater than 1.0, you'll get square wave gratings. So, set contrast to 1e5 or so.

Cheers!
Andrew
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