White Screen Flash (During Runtime)

[David McFarlane]

Nick,

You should definitely take this up with PST Support 
(https://support.pstnet.com ), if you have not already.  And then 
please report back here with the results.

Thanks,
-- David McFarlane


At 3/12/2014 02:38 PM Wednesday, Nick wrote:
>I've recorded a video of the presence of the white screen, and have 
>provided a link to the file that is stored by Dropbox.
>
><https://www.dropbox.com/s/npm678rb28vnzu6/ch04-01.avi>https://www.dropbox.com/s/npm678rb28vnzu6/ch04-01.avi
>
>It occurs at trial <https://support.pstnet.com/requests/395>#395 of 
>the third test block of "IncOrder" <https://support.pstnet.com/requests/6>#6.
>
>It appears to occur after the offset of the flanker array and before 
>the presentation of visual feedback.
>
>Could this be a hardware issue?
>
>
>-Nick
>
>
>On Tuesday, March 4, 2014 5:43:41 PM UTC-5, Nick wrote:
>Dear All,
>
>I'm hoping to receive some guidance on a strange bug in my E-Prime task.
>
>Here's a brief description of the program:
>
>1. An arrowhead version of the flanker task that consists of 4 
>different stimuli (<<<<<, >>>>>, <<><<, >><>>).
>2. The flanker stimuli are presented in white text against a black 
>background.
>3. There are 3 test blocks that each contain 400 trials and the 
>participant responds using the SRBox.
>4. The task is administered while EEG is continuously recorded.
>5. Each test block lasts for 20 minutes. The total task takes 60 minutes.
>
>Here's a brief description of the problem(s):
>
>1. Each time I run the task, there is one isolated instance where 
>the screen briefly turns white for no more than 300ms.
>
>2. The program continues to run after this occurs and the script 
>always terminates successfully.
>
>3. There is no pattern as to when this occurs (e.g., could be 5 
>minutes in to the task or 15 minutes) and does not appear to be 
>specific to a certain trial # or test block.
>
>Miscellaneous Troubleshooting:
>
>1. I've checked the power settings on the CRT monitor that is used 
>to present the stimuli. The hard drive and monitor have been set to 
>never go on standby or go to sleep.
>2. The script always compiles without any errors.
>3. There are no unreferenced E-objects.
>4. Participants do not have access to the keyboard that is used to 
>execute the task (I viewed several threads (and the PST website) 
>commenting on how this could be triggered by the windows start 
>button on the keyboard)).
>5. I initially thought this could represent a run-time error, but it 
>seems strange to me that it would self-correct and resume.
>
>
>Any thoughts/comments would be much appreciated.
>
>-Nick

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