Running a new procedure after fixed number of trials

[David Vinson]

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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