Visual Stimuli  by Prof. Michael Bach

Moving Grating

A fullscreen squarewave grating, which moves left- or rightwards. You can configure the speed and spatial frequency. The lateral borders have a contrast taper to reduce luminance artifacts for low spatial frequencies.

Caveats

• For artifact-free motion, a fast computer with a screen not larger than necessary is advisable.
• At high speeds or high spatial frequencies, beware of aliasing, depending on your frame rate. Don’t hesitate to contact me for any questions.

Some Details

This stimulus was developed in co-operation with Hadas Kalish to assess acuity in fish populations. First developed for the following publication:

• Stiebel-Kalish H, Reich E, Rainy N, Gothilf Y, Bach M (2012) Gucy2f zebrafish knockdown – a model for GUCY2D-related Leber congenital amaurosis. Eur J Hum Genetics 20:884–889. Later used in:
• Fries R, Scholten A, Säftel W, Koch K-W (2013) Zebrafish Guanylate Cyclase Type 3 Signaling in Cone Photoreceptors. PLoS ONE 8:e69656
• Rainy N, Alon A, Pomeranz A, Nisgav Y, Livnat T, Bach M, Gerstner C, Baehr W, Gothilf Y, Stiebel-Kalish H (2016) Knockdown of unc119c results in visual impairment and early-onset retinal dystrophy in zebrafish. Biochem Biophys Res Comm 473(4):1211–1217

Download

• Mac OS X application: MovingGrating1.3.app.zip • MovingGrating1.2.app.zip
  If you receive a message “… from an unknown developer…”, that happens because I did not “sign” the application, which only developers with a paid plan can do. Since this application is free, I cannot afford to pay developers’ fees.
  After unzipping, simply right-click “MovingGrating 1.3.app”, select “open”, and confirm. From then on the application opens without warning.
• Windows application: MovingGrating1.3.exe.zip • MovingGrating1.2.exe.zip
  If you receive a message “… unverified developer  … ” or similar, the reason is the same as in the above description. Bypass the warning, and deselect the appropriate tick box to avoid that warning from then on.

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