White Screen Flash (During Runtime)

[Nick]

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

It occurs at trial #395 <https://support.pstnet.com/requests/395> of the 
third test block of "IncOrder" #6 <https://support.pstnet.com/requests/6>. 
It can viewed around the 1:35:00 mark of the video and happens at 1:35:25.

It appears to occur after the offset of the flanker array and before the 
presentation of visual feedback.

Could this be a hardware issue?

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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