help desperately needed

[Michiel Spape]

Hi,
If you have working code for this design, then what is the problem? Do you get stuck somewhere or do you basically want somebody else to code your experiment? If the latter, than you might need to hire a programmer - I'm sure there are more than enough people here willing to act as one. If your budget doesn't really stretch that far, I'd suggest reading the tutorial and the absolutely marvellous E-Primer http://step.psy.cmu.edu/materials/EPrimer.pdf . On the other hand, if you're way past that, you could try rephrasing your plea for help in a way which makes it more possible for people here to shine: is the blue color the problem? Do you not know how to have 200 trials? Is the proportion/probability of trial type a problem? Each of these seems unlikely, but it is impossible to get a clue from your email.
Best,
Mich

Michiel Spapé
Research Fellow
Perception & Action group
University of Nottingham
School of Psychology
www.cognitology.eu

From: e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] On Behalf Of Grisha R
Sent: 09 August 2011 09:17
To: e-prime at googlegroups.com
Subject: help desperately needed

Hello,
I've been struggling in vain to design an experiment in e-prime since last several days. The problem is that I have absolutely no background in programming or computer science. I'm pleading you for help.
Here is the design:

To get blue color participant presses left-arrow key and to get red color he presses right-arrow key; he can press either key as per his wish. There are total two hundred trials. Of the total left-arrow key presses for blue, only 50% of the times he gets blue color, whereas remaining 50% of the time he gets the other color, that is, red. In the 50% blue that he is getting, half are blue squares and the remaining half are blue circles; and in the other 50% yellow, half are yellow squares and the remaining half are yellow circles. Same for right-arrow key presses for yellow: that is, of the total right-arrow key presses only 50% get him yellow color and the remaining 50% get him the other color, that is, blue. Of the total yellow, half should be yellow squares and the half should be yellow circles; and of the total blue, half should be blue squares and the other half should be blue circles. The participant reports the shape (whether he saw square or circle, and not the color) by pressing an appropriate key (say, upward-arrow key for square and the downward-arrow key for circle).

The appearances of stimuli should be randomized for each key-press. The percentages should be maintained close to [75% and 25%] and [50% and 50% for squares and circles] (as mentioned above) following each key-press.
The time duration for making a response is to be recorded for each trial. Also, the time the participant takes to make the next left- or right-arrow key press (after reporting what he saw in the preceding trial) is also to be recorded.
I have working code in e-prime for this design.


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