FW: change of reinforcement contingencies across participants

Fri Mar 30 19:33:00 UTC 2007

Dear E-prime community,

With regards to my last email (see below), I have been trying to use an
array to solve my problem. I have the feeling that I am on the right
track, but would need your help. In my SessionProc I have put an Inline
(see Inline1 below) to declare my array and randomized it. In the
TrialProc, I have put another Inline which changes the pictures
displayed in the column attribute Picture1 and Picture2 - the names of
the bitmap files in my columns Picture1 and Picture2 are not cow.bmp;
car.bmp as I wrote in my first email (this was just to explain the
task), but 1.bmp; 2.bmp etc...

When I run the task, I am getting the following error message:

Cannot load bitmap file "Picarray(8)"

Invalid file

The error message mention a different file each time I run the task,
which seems to indicate that the randomization is working. Any
suggestions on how to get this right would be much appreciated! Thanks.

Stephan 

------------------------------------------------------------------------
--------

Inline1

Dim Picarray(9) As String

Picarray(0) = "1.bmp"  

Picarray(1) = "2.bmp"

Picarray(2) = "3.bmp"

Picarray(3) = "4.bmp"

Picarray(4) = "5.bmp"

Picarray(5) = "6.bmp"

Picarray(6) = "7.bmp"

Picarray(7) = "8.bmp"

Picarray(8) = "9.bmp"

Picarray(9) = "10.bmp"

RandomizeArray Picarray

------------------------------------------------------------------------
---------

Inline2

if c.GetAttrib ("Picture1") = "1.bmp" then

            c.SetAttrib "Picture1", "Picarray(0)"

end if

if c.GetAttrib ("Picture1") = "2.bmp" then

            c.SetAttrib "Picture1", "Picarray(1)"

end if

if c.GetAttrib ("Picture1") = "3.bmp" then

            c.SetAttrib "Picture1", "Picarray(2)"

end if

if c.GetAttrib ("Picture1") = "4.bmp" then

            c.SetAttrib "Picture1", "Picarray(3)"

end if

if c.GetAttrib ("Picture1") = "5.bmp" then

            c.SetAttrib "Picture1", "Picarray(4)"

end if

if c.GetAttrib ("Picture1") = "6.bmp" then

            c.SetAttrib "Picture1", "Picarray(5)"

end if

if c.GetAttrib ("Picture1") = "7.bmp" then

            c.SetAttrib "Picture1", "Picarray(6)"

end if

if c.GetAttrib ("Picture1") = "8.bmp" then

            c.SetAttrib "Picture1", "Picarray(7)"

end if

if c.GetAttrib ("Picture1") = "9.bmp" then

            c.SetAttrib "Picture1", "Picarray(8)"      

end if

if c.GetAttrib ("Picture1") = "10.bmp" then

            c.SetAttrib "Picture1", "Picarray(9)"

end if

if c.GetAttrib ("Picture2") = "1.bmp" then

            c.SetAttrib "Picture2", "Picarray(0)"

end if

if c.GetAttrib ("Picture2") = "2.bmp" then

            c.SetAttrib "Picture2", "Picarray(1)"

end if

if c.GetAttrib ("Picture2") = "3.bmp" then

            c.SetAttrib "Picture2", "Picarray(2)"

end if

if c.GetAttrib ("Picture2") = "4.bmp" then

            c.SetAttrib "Picture2", "Picarray(3)"

end if

if c.GetAttrib ("Picture2") = "5.bmp" then

            c.SetAttrib "Picture2", "Picarray(4)"

end if

if c.GetAttrib ("Picture2") = "6.bmp" then

            c.SetAttrib "Picture2", "Picarray(5)"

end if

if c.GetAttrib ("Picture2") = "7.bmp" then

            c.SetAttrib "Picture2", "Picarray(6)"

end if

if c.GetAttrib ("Picture2") = "8.bmp" then

            c.SetAttrib "Picture2", "Picarray(7)"

end if

if c.GetAttrib ("Picture2") = "9.bmp" then

            c.SetAttrib "Picture2", "Picarray(8)"

end if

if c.GetAttrib ("Picture2") = "10.bmp" then

            c.SetAttrib "Picture2", "Picarray(9)"

end if

------------------------------------------

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: De Brito, Stephane 
Sent: 19 March 2007 17:16
To: 'eprime at mail.talkbank.org'
Subject: change of reinforcement contingencies across participants

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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listserv.linguistlist.org/pipermail/eprime/attachments/20070330/61312b9b/attachment.htm>