hello everybody!
Once again, I hope that somebody could help me because my knowledges about MATLAB are not sufficient enough to finish my actual script.
In the Files, you can find the zip file with the script and stimuli (the name is 'Script Libet')
There are a lot of 'little' (I hope) manipulations to do to finish this one.
- Stimuli are going to scroll on the screen. When he/she want, participant has to push a button, but the stimuli must continue to scroll during a random interval of 800 ms to 1,500 ms after the button press, like if the clock continued its rotation normally. And then the trial can end.
--> I have try to use If-end, but without success.
- As you can see on the script, the rotation begins always on the top of the clock. But the first position of the rotation must be random. In fact, the dot on the clock must begin at a random position, and then continue naturally (for exemple if that begins on the Pos20, than the script has to continue Pos21, Pos 22, etc.). I know how to realize a complete randomisation of the stimuli, but I don't know how to do an alea for just the first one.
- In my script, after pushing the button and the rotation is stopped, participants has to indicate when they have 'felt the urge' to push the button with the help of the clock and the keyboard. To do that, a clock must be showed on the screen, and with upward and downward arrows on the keyboard, participant could chose what was the position of the dot. I would that dot moves with arrows ( for example, is he want to select the Pos 20, he begins on the Pos 1 and clicks on the Downboard arrow, but if he goes to the Pos 21, he can click on the Upward arrow to go back). To finish, when he agrees, he pushes on 'Enter' and the answer (the name of the actual pictures) appears on external files with results.
Thank a lot for helping me!!!!!!
Emilie
Once again, I hope that somebody could help me because my knowledges about MATLAB are not sufficient enough to finish my actual script.
In the Files, you can find the zip file with the script and stimuli (the name is 'Script Libet')
There are a lot of 'little' (I hope) manipulations to do to finish this one.
- Stimuli are going to scroll on the screen. When he/she want, participant has to push a button, but the stimuli must continue to scroll during a random interval of 800 ms to 1,500 ms after the button press, like if the clock continued its rotation normally. And then the trial can end.
--> I have try to use If-end, but without success.
- As you can see on the script, the rotation begins always on the top of the clock. But the first position of the rotation must be random. In fact, the dot on the clock must begin at a random position, and then continue naturally (for exemple if that begins on the Pos20, than the script has to continue Pos21, Pos 22, etc.). I know how to realize a complete randomisation of the stimuli, but I don't know how to do an alea for just the first one.
- In my script, after pushing the button and the rotation is stopped, participants has to indicate when they have 'felt the urge' to push the button with the help of the clock and the keyboard. To do that, a clock must be showed on the screen, and with upward and downward arrows on the keyboard, participant could chose what was the position of the dot. I would that dot moves with arrows ( for example, is he want to select the Pos 20, he begins on the Pos 1 and clicks on the Downboard arrow, but if he goes to the Pos 21, he can click on the Upward arrow to go back). To finish, when he agrees, he pushes on 'Enter' and the answer (the name of the actual pictures) appears on external files with results.
Thank a lot for helping me!!!!!!
Emilie