Simple cumulative timing question

[FrankBank]

Scott, i just had one more idea about your issue.  Is it possible your 
refresh rate is not exactly 60hz, but something very close?  If so then 
when you set it to 100 ms and get occasional 116 ms times maybe that's 
because the actual refresh rate of your monitor is slightly higher than 
60hz so that the refresh cycle x 6 = something a little less than 100 ms 
(based on my previous post about percentages).  Then, when you drop it to 
say 90 or 95 ms you are under the 6 cycle limit and so you start getting a 
very high percentage of full 6 cycle duration trials.  If something like 
this is the case than perhaps your actual multiple of a refresh cycles is 
in the range between 95 and 100 ms and once you find it exactly you will 
have consistent durations (somewhere in that range) across all trials.  
Just an idea.

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