By emilia - 3/10/2016
Hi,
I”m trying to create a change detection task using flicker paradigm, and i have several problems:
1. can i set 6 stimuli (pictures) from 3 different files to be displayed in a circle (like a clock)?
2. can i set that only 1 pictures to change randomly with a picture from a specified file to create the flicker effect?
Thanks
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By Dave - 3/10/2016
> 1. can i set 6 stimuli (pictures) from 3 different files to be displayed in a circle (like a clock)?
Yes. Define the positions in e.g. a <list>, assign them to the respective <picture> elements as needed.
> 2. can i set that only 1 pictures to change randomly with a picture from a specified file to create the flicker effect?
Yes. It's unclear to me what the specific problem here is, so I'm not sure what else to say. Perhaps you can elaborate.
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By emilia - 3/10/2016
1. i„m having trouble with the specific positions so that i can create a circle (so far all i could do was a square).
2. 6 pictures will be display for 250 ms, than a blank image for another 250 ms, and then i need to display 6 pictures again (5 of them have to be from the initial display and in the exact same position and 1 has to be different, randomly selected from one specific file), than the blank image and then again the initial 6 pictures, and so on, until the participant give an answer.
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By Dave - 3/10/2016
In general, I'd recommend taking a look at the available flicker paradigm script:
https://www.millisecond.com/download/library/FlickerParadigm/
Re. #1: I'm having trouble understanding the profound difference between arranging objects in a square and arranging them in a circle. Obviously, 6 objects do not make up a circle in and of themselves. So, what "positions" on the hypothetical circle do you want the objects to inhabit? 12 'o clock, 3 'o clock, etc.. Do you want six *fixed* positions around the hypothetical circle or a larger set and just pick six per trial, etc.?
FWIW, Inquisit has trigonometric functions and you can use those to compute exact positions around a circle. See e.g. the SDRT ( https://www.millisecond.com/download/library/SpatialDelayedResponseTask/ ) for an example of that.
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