Running a new procedure after fixed number of trials

[David Vinson]

Oops I made a slight error in my previous mail - the inline code as 
written would run the procedure on every trial *except* 30...60...90 
etc.  = should be >.

-dv

On 11/02/2012 10:44, David Vinson wrote:
> Hi Christina,
>
> This is a common situation, for example when inserting a break every N 
> trials.
>
> The easiest way I've found to do it is to insert that procedure 
> ("NewProc") as if it occurred every trial, then add a Label 
> immediately after it ("JumpToLabel").  Then right before the procedure 
> add an inline to check the sample number and go to the "JumpToLabel" 
> (thus skipping past NewProc) unless it meets your requirements
>
> If c.GetAttrib(c.GetAttrib("Running") & ".Sample")  MOD 30 = 0 Then
>   goto JumpToLabel
> End If
>
> There's a sample experiment on the e-prime support site,
> http://www.pstnet.com/support/samples.asp?Mode=View&SampleID=33
> which does a similar thing, instead by running a procedure that sits 
> outside of the main experiment procedure (Unreferenced Objects) - in 
> this case the input masks would need to be set with an additional line 
> in inline code (see the sample InsertPause.es for more info).
>
> One note - if your inserted procedure is something that logs data 
> (e.g. *.ACC etc) you may need to clear these values on instances in 
> which the event is skipped - otherwise they may inherit the values 
> from the last trial in which NewProc was run.
>
> hope this helps,
> -dv
>
>
> On 10/02/2012 18:26, Christina B Young wrote:
>> Hello,
>> I am running into a problem that hopefully has a straight-forward
>> solution.  In my experiment, I have 90 trials that occur in random
>> order and the randomization is critical.  However, after the 30ths and
>> 60th trial, I would like to add a new procedure, but then have the
>> experiment continue with the original trials.  So the order would be:
>> 29th trial, 30th trial, new procedure, 31st trial, 32nd trial, etc.
>> Does anyone have any ideas on how to do this?  Thanks!
>>
>> Christina
>>
>

-- 
David Vinson, Ph.D.
Senior Postdoctoral Researcher
Cognitive, Perceptual and Brain Sciences Research Department
University College London
26 Bedford Way, London WC1H 0AP
Tel +44 (0)20 7679 5311  (UCL internal ext. 25311)


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