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Problem when script is run using a web-link

BG — Tue, 28 Mar 2017 21:45:48 GMT

Hi,

I have developed a task that runs as intended when the script is executed on my local computer. However, when I upload the script to the web, and execute it using a web-link, the task no longer runs correctly. Specifically, if I make a response before the screen has been cleared, then I get a 'flash'. It seems to be that, once a response is made, all of the images on-screen are cleared and then redrawn, before the final clearscreen command (as mentioned, this doesn't happen when I run the script locally). I've copied what I assume is the most relevant bit of the script below. Are there any generic reasons why the task would run differently when executed over the web or is it something specific to my script?

Thanks in advance for any help.

Ben

/ stimulustimes = [0 = prac_left, prac_right; 500 = probe_left, probe_right; 700 = prac_left, prac_right; 1000 = clearscreen]
/ inputdevice = keyboard
/ beginresponsetime = 500
/ responseinterrupt = trial
/ validresponse = (79, 80, 81, 75, 77, 71, 72, 73)
/ iscorrectresponse = [trial.probeprac.response == values.probeleftcorr || trial.probeprac.response == values.proberightcorr]
/ ontrialend = [values.lastprobeleft = values.probeleft; values.lastproberight = values.proberight]
/ posttrialpause = 500
</trial>

RE: Problem when script is run using a web-link

BG — Tue, 28 Mar 2017 21:45:48 GMT

[quote]

[b]Dave - Tuesday, March 28, 2017[/b]

[quote]

[b]BG - Tuesday, March 28, 2017[/b]

[quote]

[b]Dave - Tuesday, March 28, 2017[/b]

[quote]

[b]BG - Tuesday, March 28, 2017[/b]

[/quote]

> Are there any generic reasons why the task would run differently when executed over the web

No, the code that executes scripts is literally the same in both Inquisit Web and Inquisit Lab. Could you post the link to the respective launch page?

[/quote]

Hi Dave,

Thanks for taking a look. Link to demo version - just use the spacebar to respond. If you mash it a couple of times while the pair of images is on-screen you should see the problem.

http://research.millisecond.com/bengrafton/prac.web

[/quote]

Thanks -- I think I'm seeing the "flash" (not 100% sure because it's subtle), although oddly enough I think I'm seeing it under *both* Inquisit Lab and Inquisit Web.

Can you try with the attached, minor revision of the script? It explicitly sets the various <picture> elements' /erase attributes to false and as far as I can see does not exhibit any flashing. Do you see the same or different results on your system? Thanks!

[/quote]

That looks to have fixed it - thanks for your help!

RE: Problem when script is run using a web-link

Dave — Tue, 28 Mar 2017 18:39:29 GMT

[quote]

[b]BG - Tuesday, March 28, 2017[/b]

[quote]

[b]Dave - Tuesday, March 28, 2017[/b]

[quote]

[b]BG - Tuesday, March 28, 2017[/b]

[/quote]

BG — Tue, 28 Mar 2017 17:35:12 GMT

[quote]

[b]Dave - Tuesday, March 28, 2017[/b]

[quote]

[b]BG - Tuesday, March 28, 2017[/b]

[/quote]

RE: Problem when script is run using a web-link

Dave — Tue, 28 Mar 2017 08:32:17 GMT

[quote]

[b]BG - Tuesday, March 28, 2017[/b]

[/quote]