problem with summation object

[Paul Gr]

Hello Rob,

I don't think the problem relates to the summation object itself. In some 
cases the values of attributes are not set properly during the script. 
Instead, you could use the parameters of the corresponding EBasic objects 
directly. It is in some cases also required to manually terminate an 
infinite response. Just try the following:

If stimulus.InputMasks.IsPending Then stimulus.Terminate
OverallAcc.AddObservation stimulus.ACC

To validate this, you could add some test code before the two lines above:

Debug.Print "---- "
Debug.Print "pending: " & stimulus.InputMasks.IsPending
Debug.Print "acc:       " & stimulus.ACC
Debug.Print "acc$:     " & c.stimulus("stimulus.ACC")


Cheers,
Paul




From:  Rob Hester <hesterr at unimelb.edu.au>
To:  eprime at mail.talkbank.org
Subject:  problem with summation object
Date:  Fri, 20 Jan 2006 12:13:32 +1100
>To the mailing list,
>
>I have been successfully using the summation object script (available on 
>the e-prime website) to collect and average the number of correct responses 
>from 100 trials, but I've run into a problem when I changed the stimulus 
>timing properties of the task.
>I've have a flanker task setup so that the stimulus display object is 
>presented for 100ms and then changes to a second stimulus display object (a 
>blank screen) while it waits for the participants response. I have the 
>stimulus display object 1 response properties configured so that it runs 
>for 100ms (cumulative timing with 100ms) with the response input time limit 
>set to 'infinite' and end action set to 'terminate'. Stimulus display 
>object 2 does not accept responses, but is set to an infinite time limit. 
>The summation object in line script is placed after Stimulus display object 
>2 (although it doesn't matter if I move it to after SDO1), and reads:
>
>'The AddObservation command adds the ACC value of object
>'StimulusPresentation to the Summation object, OverallAcc.
>OverallAcc.AddObservation c.GetAttrib ("stimulus.ACC")
>
>'The Debug.Print command prints the mean value of the Summation
>'object, OverallAcc, in the Output window.
>Debug.Print OverallAcc.Mean
>
>'The OverallACC attribute adds the running calculation of overall
>'accuracy to the data file at the trial level.
>c.SetAttrib "OverallAcc", OverallAcc.Mean
>
>
>How does having the second display object interfere with this script, 
>because removing makes the summation work perfectly? Anyone got a 
>suggestion?
>
>Cheers
>Rob
>
>
>
>Dr Rob Hester
>Research Fellow
>Department of Psychology
>University of Melbourne
>Victoria 3010
>Australia
>Tel: +61 3 83443684
>Fax: +61 3 9347 6618
>hesterr at unimelb.edu.au
>
>