[solved] seek help - visual search paradigm

yatyat0321 · August 2013

I am a new user of OpenSesame and I know not much about programming.

However, as I am recently conducting a experiment that need to set up a computerized task for the participants, I hope that you guys can give me some pieces of advice how I can set up the task by using OpenSesame.

My task is using a visual search paradigm. Basically the task is that participants have to pick the odd pictures from a 4 x 4 picture grid (1 target, 15 distractors). I wish to program a randomized task that it can randomly assign a target picture to the grid at a random position and the rest will fill up with the distractors randomly. If a position is taken by the target in the present trial, the target in next trial will be placed to anther location. Until 16 places are used. I have 4 targets per condition, resulting in a total of 64 trials for a condition (total 4 conditions). My task aims at investigating time spent from the start of the trial to the hit of the target. Is it possible to make it? Do you guys have a script/tutorial similar to my setting? Or do you have any idea to make the setting like this?

Thank you guys!!

lvanderlinden · August 2013

Hi,

I made an example experiment in which the participant has to search for a red circle (the target) among 15 distractors, placed on a 4x4 grid. A block has 16 trials, and the target will never appear on the same location within a given block. Feature search and conjunction search are varied between blocks. Is something like that what you're looking for?

You can find the example experiment here (download, change the extension into '.opensesame' instead of '.txt', and open as normally):

http://pastebin.com/m0sp3gc3

More information is given in the comments in the example experiment.
You can adapt this script to your specific purpose, and don't hesitate to ask any further questions!

Best,

Lotje

lucie · July 2014

Hi Lotje,

Thank you for your example. I start using OpenSesame.
I looked at your script, but I have a question (this is important for my experiment):
I want to know if it is possible to make a "supra" list for that a target (image + sound) is heard once per participant and the sound is different for each participant. I have 8 images and 9 sounds for each image, so 72 possibilities. In experiment, a participant will hear and see only 8 possibilities every time.
For example, in your experience, it is as if I wanted the red round is seen once in the condition "red square" per participant and in other positions for other participant. I have therefore need 16 participants for the position of the red round is seen in all positions in this condition.
I hope to be understood.
If this is not the case, tell me and I'll try to reformulate it.

Thank you in advance for your help.

Best,

Lucie

lucie · July 2014

Hi Lotje,

I'm sorry for my previous post but I managed to solve my problem.

Best,

Lucie

sebastiaan · July 2014

Good to hear that you figured it out!

Aysha_B · October 2015

Could you please tell me how you solved that? Because I'm stuck with a similar thing. I have a set of words which are supposed to be presented along with the corresponding audio file. For eg. ba(written word) with ba(sound). This should happen simultaneously. and there are about 15 such words and audios.

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[solved] seek help - visual search paradigm

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