Hello all, I met a problem that I don’t think I can solve it by myself. I am asking for your help sincerely. I have a stimulus set. One stimulus set contains many object categories, and each categories consist of four pictures. The question is that I don’t know how to randomly select one picture …

[image] wakecarter: I would change while to if in both locations but that otherwise looks okay. Note Wakefield’s earlier suggestion ^^^ But also note that you specify stimulus_set = None and then immediately check the value of stimulus_set: there is not much point in that, as you’ve just set…

Maybe I should simpllify my question: How to randomly pick one picture from four pictures in each trial?

It sounds like you need a spreadsheet with one row per category and columns for Category, Pic1, Pic2,Pic3,Pic4 Then in a code component above your image component you could have the following in Begin Routine. thisPic=None picChoose=randint(0,4) if picChoose==0: thisPic=Pic1 elif picChoose =…

Thank you very much. Let me have a try. :smiley:

That works. Thanks sincerely! However, I have another question about randomization. I have another stimulus set, which contains many object categories. The difference is that each object categories consists of eight object pictures. It is composed of 2 levels of exemplars, 2 levels of orientation,…

I’m sorry but this sounds like several questions. Between subject variables are best set in the expInfo dialogue box (to ensure equal distribution of conditions). Random allocation in code is fine for some variables but can result in randomly having very different group sizes, especially in small s…

I think you are totally correct. I did’t have a clear thought about the problem. Now let me make it clear. In my condition file, there are eight pictures. I want the computer to randomly pick one from Pic1 to Pic4,or from Pic5 to Pic8(to control the Orientation variable). Then how to modifly the …

The easiest option would be to split them into two separate Excel files and then select columns 1-4 as above. [image] How to manipulate a between-subject variable in one experiment procedure? Builder One way of doing it is to point at different Excel files. For example: …

Hello wakecarter, Thanks for your patient help. I am not so good at codes. I have two stimulus sets. In the OE stimulus set, each object category has 4 object pictures; In the CAD stimulus set, each object category has 8 object pictures. I want to randomly pick pictures in the two stimulus set. I …

I would change while to if in both locations but that otherwise looks okay.

Hello wakecarter, Sorry to bother you. When I use the following codes in the Begin Routine, the pictures were all missed. thisPic=None stimulus_set = None while stimulus_set == "OE": picChoose=randint(0,4) if picChoose==0: thisPic=Pic1 elif picChoose ==1: thisPic=Pic2…

How to present one picture randomly

Builder

wakecarter April 4, 2021, 7:48am 8

The easiest option would be to split them into two separate Excel files and then select columns 1-4 as above.

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How to present one picture randomly

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