White Screen Flash (During Runtime)

[Nick]

Dear David,

I believe, together with PST technical support, that we've resolved the 
issue.

Here's a brief list of the steps we took to remedy the issue:

1) The computer running the program was connected to a local area network. 
While I run the program from the C:\ drive as a means to avoid network 
failure, I was unaware that being connected to a network could interfere 
with timing and other issues (i.e., 
http://pstnet.com/support/kb.asp?TopicID=5555).

2) I removed the ethernet cable from the machine running the flanker task.

3) I also modified two objects that were in the original file, which can be 
viewed via the attached screen cap.

       a. ClearScreen Text Display Object: Previously set to 0; changed to 
10ms. With a prior duration of 0, the object was technically still on the 
screen for a single-screen refresh, which is around 16ms.
     
       b. Wait3Seconds Object: Changed the properties - More specifically, 
I changed the onset sync property from "vertical blank" to "none."


After making these modifications, the issue *knock on wood* appears to have 
been resolved. I was concerned that it was a video card issue as the 
machine we're using is older and only has 128mb of RAM (although these 
specifications appear adequate for the version of E-Prime we're using 1.2).


-Nick

On Thursday, March 13, 2014 3:41:01 PM UTC-4, McFarlane, David wrote:
>
> 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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