Is there and easy way to randomize blocks? This is, say I have Block 1 = [1 2] Block 2 = [1 3] Block 3 = [1 4] Is there are way that the blocks will be executed in a random order with each loading? I thought this used to exist at some point, the term superblock comes to mind ... ap.
Hi Andrew, The "super block" idea has been on our feature list for a long time but it has not been implemented, so at the moment there is no way to do exactly what you are asking for. There are two main work-arounds I can think of:
- Design each trial to contain 2 trials internally. This option obviously falls apart pretty quickly if you need to have more than 2 trials in a block.
- Have multiple protocols with the blocks in different order and select a random protocol to run for a subject
NOTE: The answer to this question seems to have been lost when we moved the website. As of Dexterit-E 3.8 this is possible with a bit of extra copy and paste. As of Dexterit-E 3.8 it is possible to use brackets around items in a block list. The bracketing conveys the meaning of grouping TP's together. Section 6.11 of the Dexterit-E 3.8 User Guide has detailed examples. The short answer for you is to set up a single block as: ([1, 2], [1,3], [1,4]) The numbers in [ ] will always be held together as a group and run in the exact order given. The surrounding ( ) that means that the order of the blocks inside will be randomized. Duncan
Please login or Register to submit your answer