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malfunction in adaptive n-back task script

IMPS — Fri, 11 Mar 2016 11:06:49 GMT

Hi. The script of the adaptive n-back task does not work properly. It is only starting the first 2 trials and then stops giving this error message: Unable to initialize <picture nontargetshape> item number 0. Verify the item exists and is correctly defined.
We did not do any changes to the script after downloading it. Therefore I assume that others might have encounterd similar problems and as I am completely unfamiliar with programming support would be highly appreciated.
Thanks for any help.

RE: malfunction in adaptive n-back task script

PWillette — Fri, 11 Mar 2016 11:06:49 GMT

I'm sorry...I meant to say the same picture repeated using Inquisit 5.

RE: malfunction in adaptive n-back task script

PWillette — Fri, 11 Mar 2016 10:11:03 GMT

This solution also works for the following error:
n-Back was working well using using Inquisit 4, but it would present the same picture ("1.gif") over and over again.
Once I made this change, the adaptive n-Back test worked perfectly.

RE: malfunction in adaptive n-back task script

Dave — Wed, 20 Jan 2016 07:34:11 GMT

There is a minor mistake in the script's <list notargetvalue> element that can lead to the detailed error. The fix is to change the erroneous /selectionmode specification

<list notargetvalue>
/items = (1, 2, 3, 4, 5, 6, 7, 8)
/ not = (values.currenttarget)
/ selectionmode = replace
</list>

to the proper

<list notargetvalue>
/items = (1, 2, 3, 4, 5, 6, 7, 8)
/ not = (values.currenttarget)
/ selectionmode = random
/ replace = true
</list>