Horizontal Display Line Issue

[Joanna Lewis]

Hello everyone!

I'm running a flicker paradigm in e-prime that utilizes millisecond timing 
for the alternating displays. One is a screen of black dots on a white 
background (one disappears every other flicker), the other display is gray 
scale full screen noise mask. *When the two flicker, there is a horizontal 
line that appears near the top of the screen*. We have tried to account for 
the screen updating cycles, but I can't seem to figure out why the issue 
persists. Here are more specifications.

LED monitor
Refresh rate: 60 hz
Display 1: 250 ms

onset sync: vertical blank Offset: None

Display 2: 83 ms

onset sync: vertical blank Offset: None

 
Displays lengths were chosen based on 1000/60=16.667, and 16.667*5 =83.35 
and 16.667*15=250

I'm at a dead end and am asking you if there is something I can do or it's 
not possible at this speed of presentation. Thank you for any ideas 

Joanna

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