Visual Task

AtefehRostamZadeh

Hi. As I am new to OpenSesame, I would be grateful if you could help me.

I want to design a visual task with 25 trials.  This task required detecting whether a visually presented stimulus matched the last one. Thus, participants are required maintaining the most recent stimulus in working memory, detecting a new stimulus, matching the new stimulus to the one in memory, deciding to respond or to inhibit responding, and updating the most recent stimulus. In instructions, the participants will be asked to respond by clicking on the mouse of the computer. Therefore, from the second trial, the participant should click on the mouse if the most recent stimulus does not match the previous one.

I’d appreciate it if you could tell me how to create such a task with OpenSesame and  how many block_ sequence, block_ loop and   trial_ sequence I should have in my experiment and What I should write in block_loop. 

Thanks in advance

AtefehRostamZadeh

Hi Dear Sebastian. I hope you are doing well.

As I am new to OpenSesame, I would appreciate it if you could help me. I want to design a visual task with 25 trials. In my experiment, I want to use two targets (ba and da) which are going to be presented in the right or left of the screen monitor. Therefore, my design has two factors:

·        Syllable with two levels ( ba , da)

·        Syllable side with two levels ( left, right)

First, one of these syllables (ba and da) will be displayed in the right or left of the screen monitor. Then in each trial after presentation of one of these syllables in the right or left of the screen monitor, participants will be asked to respond by clicking on the mouse if the most recent stimulus does not match the previous one or inhibit responding if the most recent stimulus match the previous one. For example, in the sequence “ba ba da ba,” the participant will be required to respond to the first “da” and the final “ba,” without taking into account the position of the stimuli on the computer monitor.

I would be grateful if you could tell me how to create such a task with OpenSesame and how many block_ sequence, block_ loop and  trial_ sequence I should have in my experiment and What I should write in block_loop. 

Thanks ever so much in advance.

eduard

Hi,

I recommend you start with the beginner's tutorial. This should get you started on the general idea of how to design an experiment. Your basic idea is not much different from the experiment in the tutorial. Next, you can check out this discussion: http://www.cogsci.nl/forum/discussion/4389/n-back-task-problem

Is an implementation of an N-back task (the paradigm you are using), or search the forum for other discussions that cover N-back tasks. A lot of questions have been asked before already, so browsing the forum will frequently help you solving your issues on your own.

Let us know if you need help ,

Eduard