White Screen Flash (During Runtime)

[Nick]

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).
>
> 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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