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The coherence of RDK

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