# Standard deviation of gaussian mask for drifting grating stimulus

**URL:** <https://mworks.discourse.group/t/standard-deviation-of-gaussian-mask-for-drifting-grating-stimulus/242>\
**Category:** Support\
**Created:** [July 11, 2019, 2:07pm UTC](https://mworks.discourse.group/t/standard-deviation-of-gaussian-mask-for-drifting-grating-stimulus/242 "2019-07-11T14:07:47Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![cstawarz](https://yyz1.discourse-cdn.com/flex031/user_avatar/mworks.discourse.group/cstawarz/32/3_2.png) [@cstawarz](https://mworks.discourse.group/u/cstawarz)\
**Post date:** [July 11, 2019, 2:07pm UTC](https://mworks.discourse.group/t/standard-deviation-of-gaussian-mask-for-drifting-grating-stimulus/242/1 "2019-07-11T14:07:47Z")

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Hi,  
I was wondering in what units the standard deviation of the gaussian mask for the drifting grating stimulus is given. Intuitively I would have thought it’s in dva, but then gratings of different widths, but with the same standard deviation should look the same (which they don’t), right? My next best guess is that it’s percentage of the stimulus width?  
Any answer would be greatly appreciated.  
Thanks a lot!  
Best  
Benedict (German Primate Center)

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**Author:** ![cstawarz](https://yyz1.discourse-cdn.com/flex031/user_avatar/mworks.discourse.group/cstawarz/32/3_2.png) [@cstawarz](https://mworks.discourse.group/u/cstawarz)\
**Post date:** [July 11, 2019, 6:05pm UTC](https://mworks.discourse.group/t/standard-deviation-of-gaussian-mask-for-drifting-grating-stimulus/242/2 "2019-07-11T18:05:21Z")

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Hi Benedict,

Please see [this discussion](https://mworks.tenderapp.com/discussions/questions/1296) for an explanation. (Adding this to the user manual is still on my to-do list!)

Cheers,  
Chris Stawarz

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**Author:** ![cstawarz](https://yyz1.discourse-cdn.com/flex031/user_avatar/mworks.discourse.group/cstawarz/32/3_2.png) [@cstawarz](https://mworks.discourse.group/u/cstawarz)\
**Post date:** [July 11, 2019, 7:26pm UTC](https://mworks.discourse.group/t/standard-deviation-of-gaussian-mask-for-drifting-grating-stimulus/242/3 "2019-07-11T19:26:54Z")

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Thanks Chris, that answered all my questions! Sorry for not looking properly first.

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**Author:** ![cstawarz](https://yyz1.discourse-cdn.com/flex031/user_avatar/mworks.discourse.group/cstawarz/32/3_2.png) [@cstawarz](https://mworks.discourse.group/u/cstawarz)\
**Post date:** [July 19, 2022, 8:48pm UTC](https://mworks.discourse.group/t/standard-deviation-of-gaussian-mask-for-drifting-grating-stimulus/242/4 "2022-07-19T20:48:25Z")

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