Is there any list of or a research of recommended 2D (or eventually 3D) shapes that should be used in psychology test stimuli? For example, circle, square, triangle, star, oval, rectangle etc.
For example, I would like to create a cognitive test with multiple elements. I will pick a circle, a square, a triangle and an oval. However, an oval has some properties similar to the circle and that can possibly lead to some distortion in the data. Do you know of any research that has addressed this issue? Or do you know of any list of recommended shapes?