I intend to build a task that presents two faces simultaneously, one at the right side of the screen and one on the left side. There are several factors that should be randomized but with equal number at the end.
1- Face gender: One of the faces should always be male and the other face, a female one. There should be equal number of gender at the end.
2- Emotions of the faces: one of the faces in each pair should always be neutral and the other face emotional (disgust or happy). The task should have equal number of neutral male and females and equal number of each emotion (disgust, happy) for each gender (male, female).
3- Sides of the screen (left, right): each pair of faces should randomly be presented in different possible conditions regarding the location. But at the end, each gender and emotions should be presented equally at each side of the screen.
4- Presentation time (500 ms, 1000 ms, and 1500 ms): each pair should be randomly presented with one of these presentation times but with the equal number of each presentation time.
The number of faces we will use are 24 people each gender (24 female, 24 male), with 3 faces each (one for each emotion), for a total of 144 images. This is important that if a face was used in a pair, it should not be selected again for another pair (for example, if a neutral face was randomly selected from the “Male 5” (by Male 5, I mean the name of that character in the dataset), no other face should be selected from “Male 5” for the next pairs even disgust or happy. Regarding the total number of trials, there should be 144 trials at the end by repeating the randomization process for the 24 first trials. Please let me know if more information is needed.
I really appreciate your comments and help.Attentional task programming.xlsx (10.4 KB)