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

[Paul Groot]

Are the pre-release times set to 'same as duration'?

And is flipping enabled' set to yes (in the display device properties)?

Paul

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[Joanna Lewis]

Paul

Our pre-release was at 33 ms, but the issue was flipping was not enabled. That solved it, thank you!!

Additional issue: Has anyone has run into the issue with the flicker paradigm occasionally not registering a keystroke response and continuing with the loop (sometimes take multiple response to register and quit the loop) and if so, how did you fix it?

Joanna