# The coherence of RDK

**URL:** <https://discourse.psychopy.org/t/the-coherence-of-rdk/25406>\
**Category:** Builder\
**Created:** [October 14, 2021, 1:45am UTC](https://discourse.psychopy.org/t/the-coherence-of-rdk/25406 "2021-10-14T01:45:59Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![hyt](https://avatars.discourse-cdn.com/v4/letter/h/f08c70/32.png) [@hyt](https://discourse.psychopy.org/u/hyt)\
**Post date:** [October 14, 2021, 1:45am UTC](https://discourse.psychopy.org/t/the-coherence-of-rdk/25406/1 "2021-10-14T01:45:59Z")

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I am new for psychopy

**Mac OS** (e.g. Win10):  
**2021.2.3** (e.g. 1.84.x):  
I want to let the signal dots move together in same direction. I change the coherence from 0to 1. but I didn’t see any changes in the experiment.  
even I change the coherence to 1 ,I didn’t see the dots move together in the same direction obviously

looking forward to your help sincerely

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**Author:** ![lilili](https://avatars.discourse-cdn.com/v4/letter/l/4bbf92/32.png) [@lilili](https://discourse.psychopy.org/u/lilili)\
**Post date:** [June 9, 2023, 9:57am UTC](https://discourse.psychopy.org/t/the-coherence-of-rdk/25406/2 "2023-06-09T09:57:42Z")

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I also encountered the same problem, did you solve it?