White Screen Flash (During Runtime)

[David McFarlane]

Nick,

Thanks for reporting back, and glad that you got it sorted out.  Hmm, 
now you got me curious -- if you want to clear the screen and then 
wait 3 s, why not just have a blank TextDisplay object with a 
Duration of 3000 (instead of a 0 s TextDisplay followed by a 3000 ms 
Wait object)?

Thanks,
-- David McFarlane


At 3/17/2014 12:40 PM Monday, Nick wrote:
>Edit: The video card has 128mb of RAM, not the PC running E-Prime.
>
>
>
>On Monday, March 17, 2014 12:37:00 PM UTC-4, Nick wrote:
>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>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>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>https://www.dropbox.com/s/npm678rb28vnzu6/ch04-01.avi 
>
> >
> >It occurs at trial 
> <<https://support.pstnet.com/requests/395>https://support.pstnet.com/requests/395>#395 
> of
> >the third test block of "IncOrder" 
> <<https://support.pstnet.com/requests/6>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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