spatial alternation task

[De Brito, Stephane]

Dear e-prime experts,

 

I am a novice in the e-prime world and would need a bit of help. I am working on a spatial alternation task (Blair et al., 2006, Neuropsychology, Vol 20, No 2, pp.153) but have difficulties implementing it. 

 

Task description: 

the participant sees 2 red cars on each side of the screen and has to figure out which one is baited with a £20 note. The participant task is to learn  that the side behind which the £20 note is located is being alternated after each correct response. After each correct response, a £20 note appear on the screen on the side selected.

 

On the first trial, both sides are baited with a £20 note (so both responses are correct). For the 2nd trial the £20 note is located behind the side not chosen on the 1st trial. On each subsequent trial following a correct response, the other side is baited. After incorrect response, the £20 note remains on the same side until the participant makes a correct response.

 

My questions are:

 

1)Is it possible to have 2 correct answer on the 1st trial? If yes, does it have to be implemented with a script or can it be done with the e- studio interface?

 

2) I know that for this paradigm I need to use contingent branching and a "Do While" or "Do Until" loop in the script. I have read the manual and tried different scripts, but without success. Any advice would be very much appreciated.

 

Best,

 

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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