change of reinforcement contingencies across participants

[Robert Dörr]

Hi Stephane,

here you can find a screenshot which explains how to integrate the
'Dispatcher' in your experiment structure:
http://www.robertdoerr.de/files/eprime/dsp.gif

Hope this helps

Robert


De Brito, Stephane schrieb:
>
> Hi Robert,
>
>  
>
> Thank you for your email and your help. I kind of understand what you
> suggested, but I am not sure that it would work with the task as it is
> designed at the moment. Would you be so kind as to clarify where I
> should create the new List ‘Dispatcher’? I have attached a print
> screen of the structure of the task as it is. Many thanks again for
> your help.
>
>  
>
> Best wishes,
>
>  
>
> Stephane
>
>  
>
> ------------------------------------------
>
> Stephane De Brito, PhD student
>
> Institute of Psychiatry
>
> King's College London
>
> Forensic Mental Health Science Department
>
> Box P023
>
> De Crespigny Park
>
> Denmark Hill
>
> London SE5 8AF
>
> United Kingdom
>
> Tel: + 44 (0) 20 7848 0711
>
> Fax: + 44 (0) 20 7848 0754
>
> website: www.iop.kcl.ac.uk
>
>  
>
> ------------------------------------------------------------------------
>
> *From:* eprime at mail.talkbank.org [mailto:eprime at mail.talkbank.org] *On
> Behalf Of *Robert Dörr
> *Sent:* 31 March 2007 10:58
> *To:* eprime at mail.talkbank.org
> *Subject:* Re: change of reinforcement contingencies across participants
>
>  
>
> Hi Stephane,
>
> you can do this without using arrays or other Inline code:
>
> Create a new List (i call it Dispatcher). This List will have as many
> rows as you have subject groups (let's say 3) and no extra attributes.
> Create three new procedures (proc1, proc2, proc3) in the 'Procedure'
> column of this List.
> Dispatcher:
>
> Weight
>
> 	
>
> Nested
>
> 	
>
> Procedure
>
> 1
>
> 	
>
>  
>
> 	
>
> proc1
>
> 1
>
> 	
>
>  
>
> 	
>
> proc2
>
> 1
>
> 	
>
>  
>
> 	
>
> proc3
>
>
> Each procedure only contains a single table (TrialTable1, Trialtable2,
> ...)  like the one you already have in your experiment. You can copy
> the old one and edit the copys separately according to your pairings.
>
> To get the whole thing running you have to adjust 'Selection' and
> 'Reset/Exit' properties of the Dispatcher List:
>     Selection->Order: 'Offset'
>     Selection->Order by: 'Subject' (or 'Group' if you want more control)
>     Exit List: after 1 samples
>
> Subject #1 will now get row 1 of the dispatcher, so proc1 will run
> with TrialTable1
> Subject #2 will get row 2.....
> Subject #5 will get row 2.....
> Subject #n will get row n mod 3......
>
> If this was too confusing, feel free to write back.
>
> Robert
>
>
> De Brito, Stephane schrieb:
>
> Dear E-prime experts,
>
>  
>
> I am working on a task in which the participant is presented with
> pairs of picture on the screen. I have 10 different pictures and each
> picture is associated with a reinforcement value which stays the same
> throughout the experiment (e.g. the cup  always wins you 900 points
> and the cow always looses you 900 points). On each trial, the
> participant has to choose one of the two pictures presented (press ‘q’
> for left hand side picture and ‘p’ for right hand side picture) and
> win has many points has he can. The reinforcement values are +900 +700
> +500 +300 +100 -100 +300 +500 +700 +900. Sometimes the participant is
> presented with 2 pictures associated with punishment (pun-pun trials)
> and has to choose the one associated with the lowest punishment (i.e.
> scored as correct); on pun-rew trials the rew is scored as correct and
> on rew-rew trials the pictures with highest reinforcement value is
> scored as correct.
>
>  
>
> The task is running fine, but I would like to change across
> participants the reinforcement contingency for each picture so that,
> for example, not every participant wins 900 point when they choose the
> cup. At the moment, I have the following attributes in my listobject:
>
>  
>
> Picture1
>
> 	
>
> Picture2
>
> 	
>
> Slidestate
>
> 	
>
> CorrectAnswer
>
> 	
>
> Correct
>
> 	
>
> Incorrect
>
> cup.bmp
>
> 	
>
> cow.bmp
>
> 	
>
> 1
>
> 	
>
> q
>
> 	
>
> You have won 900 points
>
> 	
>
> You have lost 900 points
>
> car.bmp
>
> 	
>
> spoon.bmp
>
> 	
>
> 3
>
> 	
>
> q
>
> 	
>
> You have lost 300 points
>
> 	
>
> You have lost 500 points
>
> Etc…
>
>  
>
> Basically, I would like to keep the pairing for my attributes
> ‘Correct’ and ‘Incorrect’ the same, but I want to change across
> participants the pairing in my ‘Picture 1’ and ‘Picture 2’ attributes.
> I hope I made myself clear. From the e-prime manual and discussion
> with colleagues, it seems that the best way to do this would be with
> an ‘array’, but I have not managed to work it out yet.  Any idea on
> how to achieve this would be greatly appreciated. Many thanks.
>
>  
>
> Best wishes,
>
> Stephane
>
>  
>
> ------------------------------------------
>
> Stephane De Brito, PhD student
>
> Institute of Psychiatry
>
> King's College London
>
> Forensic Mental Health Science Department
>
> Box P023
>
> De Crespigny Park
>
> Denmark Hill
>
> London SE5 8AF
>
> United Kingdom
>
> Tel: + 44 (0) 20 7848 0711
>
> Fax: + 44 (0) 20 7848 0754
>
> website: www.iop.kcl.ac.uk
>
>  
>
>  
>

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