randomize trials but make sure they are equally shown

Hi everyone,

I am writing Code for a metacognition Experiment. I would like to make sure that conditions are equally distributed within blocks of Trials (50% A, 50 B) but they are random at the same time. Shuffle just randomizes them and I have no idea how to do that. Thanks for your help.

Answer 1

[Walter Roberson]

Within each block, use randperm to choose an order.

For example:

   A = 1:20;
   B = A+100;
   AB = [A,B];

   rAB = AB(randperm(length(AB)));   %repeat as needed