Problem with remembering the previous total payoff in Iowa Gambling Task (IGT)

[Fan W]

Hi,

I am using the e-prime to modify the IGT. Everything is working fine except that the previous total payoff cannot be remembered. This leads to a problem that every time a new card is selected, the total payoff is not added from the previous total payoff in the last trial but is added from $2000 in each trial. For example:

Subjects start with $2000,

Trial no.1: Won $ 100; Lost $0; so the Total is $2000+$100-$0= $2100

Trial no.2: Won $100; Lost$300; so the Total should be $2100+$100-$300=$1900

BUT, in my design, the Total is $2000+$100-$300=$1800

The script I wrote in InLine object of the Total payoff calculation is:

If strHit="Image1" then

List 1.run c

Youwon=List1.GetCurrentAttrib ("Gaintrial")

Youlost=List1.GetCurrentAttrib ("Losstrial")

Total = 2000+Total+Youwon- Youlost

("Image1" is Deck A.

 "If strHit...means if the mouse click on Deck A, then run List1"

"List 1" is the payment schedule of Deck A.

"Youwon" is the amount of money won in each trial.

"Youlost" is the amount fo money lost in each trial.

"Gaintrial" is the attribute of List1 and is the winning schedule of Deck A.

"Losstrial" is the attribute of List1 too and is the losing schedule of Deck A.)

The amount of "Youwon" "Youlost" and "Total" are displayed on the feedback slide.

I am not sure where  I am wrong, so I hope people who know how to solve this problem may help me out!

Thank you very much!

Fan

 

[David McFarlane]

Fan,

Couldn't quite follow all of this. But whenever someone has a
problem with their program retaining previous values, I suspect that
they failed to properly use a global variable to hold the value. See
the "Using E-Basic" chapter in the User's Guide that came with E-Prime.

BTW, shouldn't the line
Total = 2000+Total+Youwon- Youlost
instead read
Total = Total+Youwon- Youlost
? And shouldn't Total be initialized somewhere once to 2000?

-----
David McFarlane
E-Prime training
online: http://psychology.msu.edu/Workshops_Courses/eprime.aspx
Twitter: @EPrimeMaster (https://twitter.com/EPrimeMaster)

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[Fan]

Dear David,

Thanks for your reply!

I figure it out! The problem is the "Initialization" InLine, I put it in the wrong position before.

Thanks!

Fan

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